Before Takeoff Check

Objective

The student will demonstrate commercial pilot-level proficiency in conducting before takeoff checks in a helicopter, understanding the purpose of each checklist item, detecting potential malfunctions, and properly configuring the aircraft for departure. Upon completion, the student will consistently perform systematic before takeoff checks with proper division of attention, maintain all powerplant parameters within limits, verify takeoff performance data, and correctly respond to ATC clearances, meeting the performance standards of ACS CH.II.D.

Measurable Outcomes:

• Explain the purpose and method for each item on the before takeoff checklist (CH.II.D.K1)
• Complete the manufacturer’s before takeoff checklist with 100% accuracy (CH.II.D.S1)
• Calculate takeoff performance for current conditions and brief emergency procedures without prompting (CH.II.D.S2)
• Verify all powerplant temperatures and pressures are within normal operating ranges before requesting takeoff clearance (CH.II.D.S3)
• Maintain Nr within ±5% of normal operating range during all ground operations (CH.II.D.S4)
• Demonstrate effective scan pattern maintaining situational awareness both inside and outside the aircraft (CH.II.D.S5)

Content

Purpose of Before Takeoff Checklist Items (CH.II.D.K1)

The before takeoff check is the final systematic verification that the helicopter is properly configured and operating normally before flight. Unlike the private pilot who simply follows checklist items, the commercial pilot must understand why each item matters—this deeper understanding enables you to detect subtle abnormalities that might not trigger obvious warnings.

Flight Control Check:

• Purpose: Verify full and free movement in all axes without binding, restrictions, or unusual feedback forces
• Detection: Cyclic should move smoothly through full range (approximately 8 inches fore/aft, 6 inches lateral depending on model); any grinding, catching, or resistance indicates mechanical interference, loose linkages, or hydraulic issues
• Commercial standard: You’re not just moving controls—you’re feeling for anomalies. A private pilot checks “controls free and correct.” You’re detecting a slight increase in friction that might indicate a worn bearing or hydraulic degradation

Engine/Powerplant Instruments:

• Purpose: Confirm all temperatures and pressures stabilize in the green arc before applying takeoff power; engine must be properly warmed and operating normally
• Detection: Oil temperature below minimum (typically 70-100°F depending on model) indicates insufficient warm-up and risk of inadequate lubrication under high power; oil pressure dropping or fluctuating suggests pump failure or leak; MGT (measured gas temperature) or TGT (turbine gas temperature) trending high indicates compressor issues or hot start damage
• Manufacturer configuration: Each turbine has specific limits—exceeding them even briefly can reduce engine life or cause catastrophic failure. You must know your helicopter’s numbers cold

Governor/RPM Check:

• Purpose: Verify the governor will maintain Nr automatically during power changes; this system prevents rotor droop or overspeed
• Detection: Split needles (Nr and Ne/N1/N2 depending on system) not joining or hunting indicates governor malfunction; manual throttle correlation check (if equipped) verifies backup control; Nr droop under power application means governor isn’t responding fast enough
• Why this matters commercially: You’ll fly passengers, external loads, or aerial work where rotor droop is unacceptable and potentially dangerous

Hydraulic Systems:

• Purpose: Confirm hydraulic boost is functioning before flight; most helicopters are controllable with hydraulics off but with greatly increased control forces
• Detection: Cycle hydraulics off (if applicable) and feel for increased stick forces; return hydraulics on and confirm forces return to light/normal; any grinding, unusual sounds, or failure to lighten indicates pump or accumulator issues
• Configuration: Some helicopters require hydraulics on for all flight (typically larger ships), others permit hydraulics-off operation

Caution/Warning Lights:

• Purpose: Final verification that no abnormal conditions exist; many systems only annunciate when parameters are exceeded
• Detection: Press-to-test function verifies bulbs work; dark panel doesn’t mean everything is fine if bulbs are burned out
• Commercial consideration: You’ll conduct an approach someday and need that chip light to work—verify it now

Flight Instruments:

• Purpose: Verify all flight instruments show reasonable indications for ground operations
• Detection: Altimeter within 75 feet of field elevation (per 14 CFR 91.411 and manufacturer specifications); airspeed zero with no wind; heading indicator aligned with magnetic compass; attitude indicator erect and stable; VSI zero or nearly zero; turn coordinator wings level; engine instruments green
• Why each matters: Altimeter error suggests blocked static port or instrument failure; compass card stuck indicates fluid loss or mechanical failure; precessing attitude indicator means failing gyro

Fuel Quantity and Boost Pumps:

• Purpose: Confirm sufficient fuel for planned flight plus reserves (14 CFR 91.151 requires day VFR: fuel to destination plus 20 minutes at normal cruise); boost pumps (if equipped) providing positive fuel pressure
• Detection: Gauge readings match visual check performed during preflight; low fuel pressure indicates pump failure, contamination, or vapor lock risk
• Commercial context: 14 CFR 119.51(d) prohibits aerial work or commercial flights without adequate fuel reserves for the operation—you can’t just “run it until the light comes on”

Transponder and Radios:

• Purpose: Verify avionics configured for departure; transponder Mode C shows correct altitude; radios set to appropriate frequencies
• Detection: Wrong squawk code causes ATC confusion and possible violation; incorrect altitude encoding creates TCAS false alerts and separation issues
• Configuration per manufacturer: Some helicopters require specific avionable switch sequences to prevent interference between systems

Takeoff Performance Review (CH.II.D.S2): Before every takeoff, you must verify the helicopter can safely complete the planned departure given current weight, density altitude, wind, and surface conditions. This isn’t optional—it’s required airmanship and risk management.

• Calculate takeoff power required vs. available: Use height-velocity diagram, HOGE/HIGE performance charts from POH/RFM; account for gross weight, pressure altitude, temperature, humidity
• Brief emergency procedures: Engine failure during takeoff (height/velocity awareness), tail rotor failure response, where you’ll go if unable to climb, forced landing areas
• Commercial standard: Private pilots often skip performance planning for “short local flights.” Commercial pilots calculate every departure because you might be at max gross weight with a passenger or load

Emergency Procedures Brief (CH.II.D.S2): Critical items to review before every takeoff:

• Engine failure during takeoff: If in height-velocity curve, where will you land; if above safe altitude, standard autorotation procedures; collective down, lower nose, maintain Nr, pick a landing spot
• Tail rotor failure: Immediate entry to autorotation if at altitude to maintain airspeed; at hover, run-on landing straight ahead
• Low rotor RPM recognition: Right pedal loaded, collective mushy, low rotor horn/light (if equipped), Nr decay; immediate collective reduction to recover Nr
• Density altitude awareness: High DA reduces power available—be prepared for sluggish climb performance

Risk Management (CH.II.D.R1, CH.II.D.R2)

Division of Attention While Conducting Before Takeoff Checks (CH.II.D.R1):

The before takeoff check occurs in a high-workload environment: you’re often on an active ramp or taxiway, monitoring ATC, watching for traffic, maintaining helicopter position, and completing checklist items simultaneously. Improper division of attention causes three common commercial pilot errors:

1. Checklist fixation: Student becomes heads-down reading checklist while helicopter drifts, traffic approaches unnoticed, or ATC issues clearance that’s missed

   • Mitigation: Use flow patterns first, then back up with written checklist; develop muscle memory for check sequences so you can look up between items; never spend more than 3-5 seconds heads-down at once

2. Traffic pattern interruptions: Other aircraft request taxi, ATC issues instructions, or ground vehicles approach during your checks

   • Mitigation: When interrupted, mark your place on checklist; don’t continue from memory after interruption—restart from marked point; if workload becomes excessive, request delay from ATC: “Helicopter 123 will need 2 minutes for final checks”

3. Rushing due to external pressure: Tower issuing takeoff clearance while you’re mid-checklist; helicopter running on hot day making you hurry

   • Mitigation: Commercial professionalism means never accepting a clearance before you’re ready; appropriate response: “Helicopter 123, we’ll need another minute for before takeoff checks” or “Helicopter 123, ready to copy clearance when you’re ready, we’ll need about two minutes before departure”

Scan pattern discipline: Effective technique: Flow inside → look outside for traffic → flow inside next section → look outside → complete checklist verification. Your eyes should sweep the full 360° visual arc at least every 10-15 seconds during ground operations.

Unexpected or Unclear Clearances from ATC (CH.II.D.R2):

Commercial helicopter operations often involve complex ATC environments: Class B/C airspace, tower-controlled airports, special use airspace, and non-standard helicopter routes. Unclear or unexpected clearances create several risks:

Common unclear clearance scenarios:

• “Helicopter 123, turn crosswind” — Do they mean standard fixed-wing crosswind or maintain runway heading? Helicopters can turn immediately after liftoff; airplanes need runway heading first
• “Helicopter 123, remain this frequency until advised” — You expected normal tower-to-departure handoff; are they giving you special handling? Why? Are you cleared through Bravo airspace or not?
• “Helicopter 123, take off at your discretion, caution wake turbulence” — How much time do you need after that 737? What’s appropriate for your helicopter weight?
• “Helicopter 123, taxi to Echo, hold short of runway 27” — You’re a helicopter; do they expect you to hover taxi or air taxi? Will you cross Charlie taxiway en route?

Professional response to unclear clearances: Never accept a clearance you don’t fully understand or cannot comply with safely. This isn’t student behavior—it’s required professional conduct under 14 CFR 91.123(a): “When a pilot is uncertain of an ATC clearance, that pilot shall immediately request clarification from ATC.”

• Read back in full and ask for confirmation: “Helicopter 123, confirm you want us to turn crosswind immediately after takeoff, and we’re cleared through the Class Bravo to the east?”
• Request progressive taxi if unfamiliar: “Helicopter 123, unfamiliar with this airport, request progressive taxi to Echo”
• Clarify altitude restrictions: “Helicopter 123, confirm we’re to remain at or below 500 feet until past the delta departure end?”
• Verify special helicopter routes: “Helicopter 123, confirm you want the eastbound helicopter route at 1,000 feet?”

Risk of assumption: Assuming you understand when you don’t causes deviations, pilot deviations, and potential accidents. ATC controllers aren’t always familiar with helicopter capabilities and limitations—you might receive a clearance meant for an airplane. You’re the pilot in command under 14 CFR 91.3(a); you’re responsible for safe operation even if following an ATC clearance.

Unexpected clearance scenarios:

• Takeoff clearance before you requested it: “Helicopter 123, wind 270 at 8, cleared for takeoff runway 27” when you haven’t finished checks yet → “Helicopter 123, we need another minute for final checks” (never accept premature clearance)
• Routing different than flight plan: “Helicopter 123, cleared to Bravo Airport via the Harbor Route, maintain 1,500” when you filed direct → Make sure you have current charts and understand the routing before accepting; if not: “Helicopter 123, unfamiliar with Harbor Route, request vectors or direct routing”
• Altitude assignment unreasonable for helicopter: “Helicopter 123, maintain 8,000, expect 10,000 in 10 miles” in a piston helicopter with 8,000-foot service ceiling → “Helicopter 123, unable 8,000, maximum operational altitude 6,500”

Manufacturer Configuration Requirements (CH.II.D.K1.c)

Every helicopter has specific before takeoff configuration requirements in the RFM/POH. Common items requiring exact manufacturer compliance:

Robinson R22/R44:

• Throttle full open (correlator functioning)
• Rotor RPM in green arc (102-104% Nr for R22, 101-104% Nr for R44)
• Clutch fully engaged
• Governor on
• All fuel boost switched as required (R44 has boost pump requirements)

Bell 206:

• N1 and Nr joined (governor operating)
• All hydraulic systems on
• Engine anti-ice as required
• All temperatures and pressures in normal range before applying takeoff power

Airbus AS350/H125:

• FADEC (Full Authority Digital Engine Control) shows normal status
• First limit indicator (FLI) showing which parameter is limiting (usually TRQ or MGT)
• All cockpit warning lights extinguished
• Hydraulic pressure normal (both circuits if dual system)

Schweizer 300C:

• Throttle coordinated (governor functioning or manual correlation correct)
• All temperatures stabilized in green arcs
• Carburetor heat off (unless icing conditions dictate otherwise)
• Mixture rich (if equipped)

Configuration errors and detection: Improper configuration causes performance degradation or system failures during takeoff—the highest workload, lowest altitude phase of flight where you have minimum time to respond.

• Governor off: Throttle won’t correlate with collective; Nr will droop when collective is raised; you’ll either have rotor stall or overspeed
• Hydraulics off when required on: Control forces excessive; you’ll have difficulty making precise control inputs during takeoff
• Improper fuel system configuration: Fuel pressure loss during high power application; engine may fail during takeoff climb
• Doors unlatched: Door opening during takeoff causes asymmetric drag, CG shift, possible control interference, and extreme startle factor

Commercial Pilot Considerations

As a commercial pilot under 14 CFR 61.133, you have privileges to carry passengers for hire, conduct aerial work, and operate for compensation. This changes your before takeoff responsibilities:

Passenger briefings must be complete before starting the checklist: You can’t safely brief passengers while completing before takeoff checks—division of attention will cause missed items or inadequate passenger safety information.

External load operations require additional checks: If configured for external loads (14 CFR 133), verify cargo hook electrical system, mirror positioning, load calculations complete, release system operational.

Professional standard of care: Courts hold commercial pilots to higher standards than private pilots. An incomplete before takeoff check that results in accident or incident will be scrutinized against 14 CFR 61.133, 91.13 (careless/reckless), and whether you exercised the level of care expected of a commercial helicopter pilot.

Regulatory Foundation

• 14 CFR 91.103: Before beginning a flight, pilot must become familiar with all available information concerning that flight, including takeoff performance data
• 14 CFR 91.7(a): No person may operate a civil aircraft unless it is in an airworthy condition
• 14 CFR 91.13: Prohibits careless or reckless operation; skipping checklist items constitutes careless operation
• 14 CFR 91.123(a): Pilot must request clarification if uncertain of ATC clearance
• 14 CFR 91.151: VFR fuel requirements (day: destination plus 20 minutes; night: destination plus 30 minutes)
• 14 CFR 61.133: Commercial pilot privileges—before takeoff check must meet commercial standards when exercising these privileges

Schedule

Equipment

Required References:

• FAA-S-ACS-16, Commercial Pilot Helicopter Airman Certification Standards (current edition)
• FAA-H-8083-21B, Rotorcraft Flying Handbook
• 14 CFR Part 61, Certification: Pilots, Flight Instructors, and Ground Instructors
• 14 CFR Part 91, General Operating and Flight Rules
• Helicopter Flight Manual (HFM) or Pilot’s Operating Handbook (POH) for aircraft being used
• Current weight and balance data for aircraft
• Performance charts for current aircraft

Materials:

• Aircraft checklist (manufacturer-provided or approved)
• Flight computer (mechanical or electronic) for density altitude calculation
• Current airport diagram and any applicable special helicopter routes
• Notepad and pen for student notes
• Current METAR/TAF for departure airport
• Simulated ATC clearance cards (for scenario training)

Visual Aids:

• Laminated checklist flow diagram showing logical grouping of items
• Instrument panel photograph with annotations showing normal vs. abnormal indications
• Height-velocity diagram enlarged and laminated for briefing discussions
• Diagram showing effective scan pattern (inside/outside division of attention)

Aircraft/Training Device:

• Helicopter configured for normal operations
• All required documents aboard (airworthiness certificate, registration, operating limitations, weight & balance)
• Sufficient fuel for training session plus reserves
• All systems operational for complete checklist demonstration

Instructor Materials:

• Lesson plan and grading sheet
• Copy of ACS CH.II.D with performance standards highlighted
• List of common before takeoff check errors and corrections
• Abnormal indications reference card for scenario training

Instructor Actions

1. Brief lesson objectives and commercial pilot standards: “Today we’re focusing on the before takeoff check from a commercial pilot perspective. This isn’t the basic ‘read and do’ checklist work from your private training. You need to understand the purpose of each item, what malfunctions you’re trying to detect, and how to manage your attention in a busy environment. By the end of this lesson, you’ll perform the before takeoff check systematically and efficiently while maintaining full situational awareness—the standard expected of a commercial helicopter pilot who might be carrying passengers or conducting aerial work.”

2. Review ACS performance standards CH.II.D: “The ACS requires you to complete the appropriate checklist, review takeoff performance and emergency procedures, verify all powerplant parameters are suitable for takeoff, maintain Nr within normal limits, and divide your attention effectively inside and outside the aircraft. Every one of these is measurable, and I’ll be evaluating your performance against these specific standards.”

3. Explain the purpose of each checklist category using real examples: “Let’s start with flight controls. You’re not just moving the cyclic around randomly. You’re feeling for binding, checking for full range of motion, and detecting anything unusual. I once had a student who did a controls check and everything moved fine—but there was a slight grinding feeling in the cyclic aft movement. We shut down and found a bolt backing out of the cyclic linkage. In another 30 minutes of flight, that bolt would have fallen out completely. That’s what you’re looking for—subtle abnormalities that indicate developing problems.”

4. Discuss powerplant instrument interpretation beyond green arc recognition: “Oil temperature isn’t just ‘in the green’ or ‘not in the green.’ If oil temp is normally 180°F after warm-up and today it’s only showing 140°F on a similar temperature day, something has changed. Maybe the gauge is failing, maybe there’s an oil cooler issue. You need to know what’s normal for your aircraft and recognize deviations. Same with oil pressure—a slow drop during your checks might mean you’re losing oil or the pump is failing.”

5. Demonstrate governor/RPM check with both normal and simulated abnormal scenarios: “Watch what happens when I raise the collective with the governor on. The throttle automatically advances, Nr stays constant, and the needles stay joined. Now I’ll show you what it looks like if the governor fails—the needles split, Nr starts to droop, and you’ll hear the low rotor horn. This is why we check governor function on the ground where we have time to troubleshoot, not during takeoff when we need it most.”

6. Teach systematic scan pattern for division of attention: “Here’s the technique I use and I want you to develop: complete one section of the checklist, then eyes up and outside for a 360° sweep for traffic and clearances. Takes about five seconds. Then back inside for the next section. Never go more than 10-15 seconds without looking outside. Even at a quiet airport, aircraft can appear quickly. At a busy airport with tower communications, you need that outside awareness or you’ll miss taxi instructions, traffic advisories, or changing conditions.”

7. Explain ATC communication professionalism for unclear clearances: “If you get a clearance you don’t understand or didn’t hear completely, you say: ‘Helicopter 123, say again’ or ‘Helicopter 123, confirm you want…’ and repeat what you think they said. Never fly an unclear clearance hoping you got it right. Controllers are human; they make mistakes, misspeak, or aren’t familiar with helicopter operations. You’re the pilot in command. It’s your responsibility to understand every clearance before you comply with it.”

8. Demonstrate calculating takeoff performance for current conditions: “Let’s work through the performance planning for this takeoff. Current field elevation is 850 feet MSL, temperature is 28°C, altimeter is 30.02. First, I calculate pressure altitude: 850 feet plus [29.92 - 30.02] × 1,000 = 850 - 100 = 750 feet pressure altitude. Now I’ll use the density altitude chart with 750 feet PA and 28°C—that gives us about 2,100 feet density altitude. Now I go to the HOGE performance chart with our current gross weight of 2,200 pounds and 2,100 feet DA. The chart shows we need about 85% torque to hover in ground effect. Our engine produces 100% torque available at this altitude and temperature, so we have adequate power margin. This is the process you’ll use before every takeoff.”

9. Brief emergency procedures specific to the departure environment: “Before we take off, let’s review what we’ll do if we have an engine failure during takeoff. We’re departing from a 100-foot wide runway with clear area on both sides. Our takeoff profile will keep us out of the avoid area of the height-velocity curve—we’ll accelerate in ground effect to translational lift speed, then climb at Vy. If we lose the engine during the acceleration phase below 10 feet, I’ll land straight ahead with available collective. If we lose it during the climb above 40 feet AGL, I’ll enter autorotation, lower the nose to maintain 60 knots and Nr, and select the clear area off the left side of the departure path. Any questions about that plan?”

10. Conduct first demonstration in the aircraft, talking through each item: “Watch how I organize this check. I start with the flight controls—full forward, full aft, full left, full right, feeling for smooth motion and correct response. Now I’m bringing the cyclic to neutral and checking collective full down, full up. Pedals full left, full right. Everything moves freely with no binding. Now I’m checking the engine instruments: oil temperature 185°F—normal for this helicopter after warm-up; oil pressure 55 PSI—right in the middle of the green; MGT 720°C at idle—normal; fuel pressure 18 PSI—normal. Notice I’m not just looking at the green arcs—I’m reading actual values and comparing them to what I know is normal.”

11. Demonstrate governor check with explanation of what to feel and hear: “Now I’ll check the governor function. Collective up slowly—throttle automatically advancing, Nr holding steady at 102%, needles joined, no split. Good. Collective back down—throttle correlating, Nr still steady. Governor is functioning normally. If those needles split or Nr droops when I raise collective, the governor isn’t working and we’re not taking off until it’s fixed.”

12. Show effective scan pattern during checklist completion: “Notice after checking those instruments, I immediately look up and outside—quick 360° scan for traffic. No aircraft moving on the ramp or taxiway. Now I’m back inside for the next section: hydraulic systems. I’ll cycle the hydraulics off, feel for increased control forces—yes, much heavier—now hydraulics back on, forces immediately light again. System is functioning. Now back outside for another scan. This constant inside-outside-inside-outside pattern is critical. You maintain awareness of your environment while completing checklist items systematically.”

13. Introduce interruption scenario during demonstration: “Here’s a common situation: I’m halfway through the checklist and tower calls: ‘Helicopter 123, taxi to runway 27, hold short of 27.’ What do I do? First, I mark my place on the checklist—I’m at the radios section. Then I acknowledge: ‘Helicopter 123, taxi to runway 27, hold short.’ Now I taxi, but I don’t continue the checklist from memory. Once I’m stopped at the hold short line, I restart from where I marked—radios section—and complete the remaining items. Never trust yourself to remember where you were after an interruption.”

14. Demonstrate proper response to unclear ATC clearance: “Let’s say tower gives me: ‘Helicopter 123, turn crosswind.’ That’s unclear because helicopters can turn immediately after liftoff while airplanes need to maintain runway heading first. Do they want me to turn now or does ‘crosswind’ mean something specific here? Professional response: ‘Helicopter 123, confirm you want us to turn crosswind immediately after takeoff?’ Controller responds: ‘Helicopter 123, affirmative, turn left crosswind immediately after takeoff, remain at or below 500 feet until past the departure end.’ Now I understand exactly what they want.”

15. Allow student to perform complete before takeoff check with minimal guidance: “Your aircraft. I want you to perform the complete before takeoff check using the checklist. Work through each item systematically, maintain your scan outside, and explain to me what you’re checking and what you’re looking for. Take your time—accuracy matters more than speed right now.”

16. Observe student technique and note errors without immediate correction: While student performs check, instructor observes: division of attention, completeness of items, understanding of what’s being checked, scan pattern, checklist discipline. Make notes but allow student to complete full sequence before providing feedback.

17. Provide specific feedback on observed performance: “Good systematic approach on that check. I noticed three things: First, you spent about 20 seconds heads-down on the instrument scan section without looking outside—that’s too long. Break that section into smaller chunks with outside scans between. Second, when you checked the flight controls, you moved the cyclic but I didn’t hear you say anything about what you were feeling. Tell me what you’re detecting—smooth motion, no binding, full range. Third, excellent job maintaining Nr throughout the check—stayed right at 102% the entire time. Let’s run it again incorporating those corrections.”

18. Introduce simulated abnormal indication scenario: “This time I want you to run the before takeoff check, but I’m going to simulate an abnormal indication. When you discover it, tell me what you found, what it means, and what action you’re taking. Here’s the scenario: you’re conducting your check and you notice oil pressure is reading 25 PSI when normal is 50-60 PSI. What do you do?”

19. Evaluate student’s response to abnormal indication and decision-making: Listen for: recognition that oil pressure is abnormally low, understanding that this could indicate oil pump failure or low oil quantity, decision to shut down and not attempt takeoff, communication of the issue to ATC or ground personnel if applicable.

20. Introduce simulated unclear ATC clearance scenario: “You’ve completed your before takeoff check and you’re ready to go. Tower calls: ‘Helicopter 123, wind 270 at 12, cleared for takeoff, turn eastbound.’ You weren’t expecting an immediate turn eastbound; your flight plan shows departure to the north. What’s your response?”

21. Evaluate student’s ATC communication and clarification request: Listen for: recognition that clearance conflicts with flight plan, immediate request for clarification, professional phraseology, not accepting clearance until understood, proper read-back when clarification received.

22. Conduct supervised repetitions until student demonstrates consistency: “Run the complete check two more times. I want to see the same systematic approach, proper scan pattern, and accurate completion every time. Commercial pilot standard means consistency—you perform this check the same correct way whether it’s your first flight of the day or your fifth.”

23. Debrief student performance against ACS standards: “Let’s review your performance against the ACS completion standards. You completed the appropriate checklist 100%—good. You reviewed takeoff performance and briefed emergency procedures—good. You verified all powerplant temperatures and pressures suitable for takeoff—good. You maintained Nr within normal limits throughout—excellent, never varied more than 2% from target. Division of attention inside and outside—this improved significantly by the third repetition. Initially you were too heads-down, but by the end you had a good rhythm with outside scans every 10-15 seconds. Overall, you’re meeting the standard, and with practice this will become second nature.”

24. Assign practice requirements and self-assessment criteria: “Before our next flight lesson, I want you to review the checklist and be able to explain the purpose of every item—not just what you do, but why you do it and what malfunction you’re trying to detect. On every flight from now on, I expect this same systematic, thorough before takeoff check. You should be able to complete it in about 3-4 minutes at this point while maintaining full situational awareness. If you find yourself taking longer than five minutes or missing outside scans, slow down and rebuild the proper technique.”

25. Answer questions and verify understanding of completion standards: “What questions do you have about the before takeoff check, the ACS standards, or how I’ll be evaluating this task on your checkride preparation flights? Remember, on your commercial checkride, the examiner expects you to perform this check without prompting, explain what you’re looking for, and demonstrate professional communication if you receive unclear clearances or discover abnormalities.”

Student Actions

1. Listen to briefing and ask clarifying questions about lesson objectives, ACS standards, or differences between private and commercial pilot expectations for before takeoff checks.

2. Take notes during ground instruction on purpose of each checklist item, common malfunctions detected, and manufacturer configuration requirements specific to the training aircraft.

3. Participate in discussion by providing examples of checklist items they’ve seen overlooked or situations where attention was divided improperly during before takeoff checks.

4. Review current weather and airport conditions to prepare for realistic takeoff performance calculations during the lesson.

5. Calculate density altitude and takeoff performance for current conditions using the aircraft performance charts, verifying adequate power available for the planned departure.

6. Observe instructor demonstration of complete before takeoff check, noting the systematic flow, scan pattern, explanation of each item, and professional handling of simulated abnormal indications.

7. Ask questions during demonstration about any checklist items, techniques, or decision points that are unclear.

8. Perform first complete before takeoff check under instructor supervision, explaining each item’s purpose and what is being verified while maintaining scan pattern outside the aircraft.

9. Self-critique initial performance identifying areas where attention was too focused inside, scan pattern broke down, or checklist items were rushed.

10. Incorporate instructor feedback on second repetition, specifically addressing division of attention deficiencies, scan pattern improvements, and systematic flow.

11. Respond appropriately to simulated abnormal indication by recognizing the abnormality, stating what it indicates, and making the correct decision (e.g., shut down rather than attempt takeoff with low oil pressure).

12. Demonstrate professional ATC communication when given unclear clearance by immediately requesting clarification using proper phraseology and not accepting clearance until fully understood.

13. Perform multiple repetitions of complete before takeoff check, developing consistency and efficiency while maintaining accuracy and situational awareness.

14. Evaluate own performance against ACS standards, identifying specific areas meeting standard and areas requiring continued practice.

15. Demonstrate understanding of when to delay takeoff if checklist cannot be completed without interruption, when to request progressive taxi if unfamiliar with airport, and when to refuse clearance if not ready.

16. Complete practice session by performing one complete before takeoff check meeting all ACS standards with minimal instructor input.

17. Ask questions during debrief about any errors made, areas of confusion, or techniques for improvement.

18. Review completion standards and commit to performing the same systematic, thorough check on all future flights to build consistency and professionalism.

19. Demonstrate ability to teach back the purpose of at least three critical checklist items, explaining what malfunction each detects and why it matters.

20. Verbally commit to self-assessment on future flights by evaluating own before takeoff check performance against the ACS standards and continuously improving division of attention and checklist discipline.

Completion Standards

The lesson is complete when the student consistently demonstrates commercial pilot-level proficiency in performing before takeoff checks, meeting all standards of ACS CH.II.D:

Knowledge Standards (CH.II.D.K1):

• Explains the purpose of each item on the before takeoff checklist, including the specific malfunction or abnormality each item is designed to detect
• Describes the reasons for checking each item beyond simple checklist compliance (e.g., “Oil temperature verifies adequate engine warm-up and proper lubrication viscosity before high power application”)
• Identifies manufacturer-specific configuration requirements for the training aircraft and explains consequences of improper configuration
• Demonstrates understanding that commercial pilots are held to higher standards of checklist discipline and system knowledge than private pilots

Risk Management Standards (CH.II.D.R1, CH.II.D.R2):

• Maintains effective division of attention throughout before takeoff check by limiting heads-down time to no more than 10-15 seconds between outside scans
• Demonstrates 360° visual scan pattern at least every 15 seconds during checklist completion
• Properly marks place on checklist when interrupted and restarts from that point rather than continuing from memory
• Uses appropriate phraseology to request clarification when ATC clearance is unclear: “say again,” “confirm,” or “unable”
• Identifies unexpected clearances that conflict with flight plan or exceed helicopter capabilities and requests alternative clearance
• Demonstrates willingness to delay takeoff if checklist cannot be safely completed due to traffic, ATC communication workload, or other distractions

Skill Standards (CH.II.D.S1-S5):

• CH.II.D.S1: Completes 100% of applicable checklist items in systematic order using the manufacturer’s approved checklist without omissions or deviations
• CH.II.D.S2: Reviews and calculates takeoff performance data (density altitude, gross weight, power required vs. available) and briefs appropriate emergency procedures for the departure environment without prompting from instructor
• CH.II.D.S3: Verifies all powerplant temperatures and pressures within normal operating range before requesting or accepting takeoff clearance; recognizes abnormal indications and makes correct decision to abort takeoff
• CH.II.D.S4: Maintains Nr within ±5% of normal operating RPM throughout all before takeoff check items, demonstrating smooth governor operation and proper collective/throttle coordination
• CH.II.D.S5: Divides attention effectively between inside and outside the helicopter, maintaining situational awareness of traffic, ground movement, and ATC communications while completing checklist items; demonstrates ability to continue checklist after interruptions without omissions

Commercial Pilot Performance Standards:

• Completes entire before takeoff check in 3-5 minutes with no items omitted
• Demonstrates professional decision-making when abnormal indications discovered (does not rationalize or attempt departure with questionable systems)
• Uses precise, professional phraseology in all ATC communications
• Explains what is being checked and why during checklist completion (demonstrates understanding, not rote memorization)
• Performs check consistently the same way on multiple repetitions
• Self-identifies errors and corrects technique without instructor prompting

Unsatisfactory Performance Indicators:

• Omits any checklist item or completes items out of sequence
• Spends more than 15 seconds heads-down without outside scan
• Fails to recognize abnormal powerplant indications (temperatures/pressures outside normal range)
• Accepts unclear ATC clearance without requesting clarification
• Allows Nr to deviate more than ±5% from normal operating RPM during checks
• Cannot explain the purpose of checklist items beyond reading the checklist text
• Rushes through checklist due to external pressure (ATC, weather, impatient passengers)
• Continues checklist from memory after interruption rather than restarting from marked position
• Demonstrates inconsistent technique between repetitions

The student meets completion standards when they perform three consecutive before takeoff checks meeting all ACS criteria listed above, with proper division of attention, no omitted items, professional communication, and appropriate response to simulated abnormal indications or unclear clearances. The student must demonstrate not just the ability to complete the checklist, but understanding of why each item matters and professional judgment in handling non-normal situations—the standard expected of a commercial helicopter pilot exercising privileges under 14 CFR 61.133.