NONPRECISION INSTRUMENT APPROACHES

Objective

Upon completion of this lesson, the ATP helicopter student will demonstrate the knowledge, risk management, and skills required to safely plan and execute nonprecision instrument approaches in a helicopter in accordance with ATP standards. The student will maintain altitude within -0/+50 feet at MDA, track within ±5° or quarter-scale CDI deflection on final approach, and execute missed approaches when visual references are not acquired. This lesson satisfies ACS task AT.VII.A (Nonprecision Instrument Approaches) and prepares the student for the precision and decision-making required in professional helicopter IFR operations.

Content

Nonprecision Approaches in Helicopters

Nonprecision approaches provide lateral guidance only—no vertical guidance to a decision altitude. At the ATP level, you already know VOR, LOC, NDB, GPS, and RNAV approaches. Our focus now is on professional execution standards and helicopter-specific considerations that distinguish ATP operations from commercial proficiency.

Key distinctions for ATP helicopter operations:

• Tighter tolerances: Commercial allows ±100 feet at MDA with -100/+100 tolerance. ATP requires -0/+50 feet—you may not descend below MDA, period. This mirrors Part 135 operational requirements you’ll fly under.
• Single-pilot resource management: Most ATP helicopter operations are single-pilot in IMC. Workload management, approach briefing discipline, and automation management are critical.
• Helicopter approach category: Most helicopters qualify for Category A approaches (approach speed less than 91 knots). This often provides lower minimums and tighter approach protected areas than higher categories. Always verify your aircraft’s approach category in the RFM or POH.
• Professional decision-making: In turbine helicopters conducting air medical, corporate, or utility operations, continuing an approach when unstable or poorly positioned creates unacceptable risk. The ATP standard demands go-around discipline.

Nonprecision Approach Types and Selection

ATP helicopter pilots must be proficient in all nonprecision approach types available at their operational airports:

VOR approaches use ground-based VOR stations. Identify the VOR with Morse code or audio identifier. Monitor DME if required for stepdown fixes or MAP identification. Heading-based procedures require you to fly published headings, not courses—wind correction comes from timing or DME, not bracketing.

Localizer approaches provide more precise lateral guidance than VOR but no glideslope. Localizer sensitivity is the same as ILS (full-scale deflection equals approximately 700 feet at threshold). Treat LOC final approach segments like precision approaches for tracking—quarter-scale or better.

GPS/RNAV approaches are increasingly common and provide superior accuracy. LNAV approaches are nonprecision (lateral navigation only). LNAV+V provides advisory vertical guidance but remains nonprecision—the +V means you have a visual descent profile, not a certified glidepath. LNAV/VNAV and LPV approaches provide vertical guidance and are considered precision-like approaches (covered separately). At ATP level, you must understand RAIM prediction, GPS NOTAMS, and WAAS availability.

NDB approaches are rare but still exist. NDB tracking requires constant heading corrections and ADF interpretation. Bearing pointer techniques and reference heading methods apply. Always identify the NDB.

Approach selection considerations:

• Lowest minimums available for conditions
• Aircraft equipment and currency (e.g., GPS navigator database current per 14 CFR 91.175(f))
• NOTAMS affecting approaches or navigation aids
• Runway alignment and landing area suitability
• Missed approach obstacle clearance and terrain

ATC Communications During Approaches

Professional communications are mandatory. At ATP level, expect progressive taxi instructions, complex clearances, and rapid frequency changes.

Approach clearance communications:

When cleared for the approach, read back the clearance: “November One Two Three Quebec Tango is cleared for the VOR Alpha approach, runway Two Seven.” If vectors to final, expect: “November One Two Three Quebec Tango, three miles from HYSON, turn left heading two five zero, maintain two thousand until established on the localizer, cleared VOR Delta approach.”

Read backs required per 14 CFR 91.123:

• Runway assignments
• Altitude assignments
• Heading assignments
• Approach clearances
• Hold short instructions

Unable to comply: If you cannot comply with any clearance (e.g., unable to maintain assigned altitude due to icing, unable to accept approach due to navigation equipment failure), immediately advise ATC: “Unable, November One Two Three Quebec Tango, requesting higher altitude due to airframe icing.” ATC will provide alternative instructions. Never accept a clearance you cannot safely execute.

Frequency management: Tower and approach frequencies change rapidly during approaches. Have the next frequency in standby. When handed off, check in promptly: “Metro Tower, November One Two Three Quebec Tango, three thousand on the VOR approach.” This confirms your position and altitude without being asked.

Navigation Equipment Selection, Tuning, and Monitoring

Every approach begins with proper setup. At ATP level, sloppy setup is unacceptable. Use flows and checklists.

Navigation equipment setup:

1. Frequency selection: Tune the primary navigation frequency (VOR, LOC, NDB). Set standby frequencies for missed approach navigation aids.
2. Identification: Identify the facility with Morse code or voice identifier. If the identifier is missing or says “TEST,” the facility is unreliable—do not use it. Report to ATC.
3. Course setting: Set the published final approach course in the course window. For VOR approaches, this is the inbound course to the VOR or missed approach holding fix course. For LOC, set the localizer front course.
4. CDI sensitivity: GPS navigators operating in terminal mode automatically sequence CDI sensitivity (±1 NM en route to ±0.3 NM terminal to ±0.3 NM approach sensitivity). Verify sensitivity mode on final approach segment—it should indicate “TERM” or “APPR” depending on the navigator.
5. Monitoring: Continuously monitor navigation signals. Cross-check multiple sources (VOR/DME, GPS position, ADF bearing if available). If navigation signal becomes unreliable or flag appears, execute missed approach and advise ATC.

Backup navigation: Professional operations require backup. If flying a GPS approach, monitor VOR or set ADF if available. If primary navigation fails, you have immediate situational awareness and can transition to backup or execute the missed approach safely.

Adjustments to MDA and Visibility

Published approach minimums assume standard conditions. You must adjust minimums for inoperative components, NOTAMs, and aircraft equipment.

Adjusting for inoperative components (14 CFR 91.175(d)):

The approach lighting system, runway lighting, and visual glideslope indicators affect minimums. If components are inoperative, consult the Inoperative Components Table in the front of the approach plate booklet or the TERPS reference.

• Inoperative approach lighting: May increase visibility requirements by ¼ to ½ mile depending on the lighting type.
• Inoperative runway lighting (REIL, HIRL, VGSI): Check the table. Some inoperative components require higher minimums.
• Helicopter notes: Some approach plates have specific notes for helicopters. Example: “Helicopter visibility reduction below ¾ SM NA.” Read all notes carefully.

NOTAMs and Flight Data Center Procedural NOTAMs:

Before every approach, review current NOTAMs. Procedural NOTAMs may:

• Raise MDA due to obstacles or construction
• Declare navigation aids out of service
• Change missed approach procedures
• Restrict approach availability to certain times or aircraft categories

Always check NOTAMS during preflight and verify with ATC or flight service if unclear. Flying an approach with an out-of-service NAVAID is a violation and potentially dangerous.

Inoperative aircraft equipment:

If your aircraft equipment is inoperative (e.g., DME required for the approach), you may not legally fly that approach unless ATC provides radar substitution for DME per AIM 1-1-17. GPS may substitute for DME and ADF per AC 90-108 if the GPS installation is IFR-approved and the database is current.

Weather reporting factors:

Visibility reported by ASOS/AWOS/ATIS is prevailing visibility. RVR (Runway Visual Range) is more accurate when available—it measures visibility along the runway using transmissometers. RVR is reported in hundreds of feet. For nonprecision approaches, if RVR is reported, you may convert it to statute miles:

• RVR 2400 = approximately ½ SM
• RVR 4000 = approximately ¾ SM
• RVR 5000 = approximately 1 SM

When RVR is out of service, rely on prevailing visibility. If visibility is fluctuating (e.g., “visibility two, occasionally one in mist”), use the lowest reported value for decision-making.

Helicopter approach category:

Helicopters using 70 knots or less final approach speed qualify for Category A minimums. Most helicopters qualify. Verify your aircraft’s approach speed and ensure you’re using the correct category minimums. Using the wrong category is a common error and may result in illegally low minimums.

Rate of Descent Planning and MDA Arrival

Arriving at MDA too high or too late is a common ATP failure point. Professional pilots plan descent to arrive stabilized at MDA with adequate time to identify the runway environment.

Descent planning:

Calculate required descent rate using this formula:

Descent rate (FPM) = Groundspeed (knots) × 5

Example: At 90 knots groundspeed, a 3-degree descent path requires approximately 450 FPM. Nonprecision approaches typically use 400-500 FPM descent rates.

Technique:

• Start descent at the final approach fix (FAF) or stepdown fix as published
• Use a constant descent rate to arrive at MDA approximately 1 NM prior to the MAP
• If you arrive at MDA and cannot see the runway environment, level off and maintain MDA until the MAP
• If you reach the MAP without required visual references, execute the missed approach—no diving below MDA to look for the runway

Stabilized approach concept:

A stabilized approach requires:

• Correct configuration (approach power, gear down if applicable, approach speed)
• On course (within ±5° or quarter-scale CDI)
• On speed (±5 knots)
• On the desired descent path or level at MDA

If any parameter is exceeded, execute a go-around. Do not continue an unstable approach. This is a professional standard and a risk management imperative.

Missed Approach Point and Visual References

The missed approach point (MAP) is defined by time, distance (DME), or a fix (e.g., VOR station passage). You must execute the missed approach at the MAP unless the required visual references are distinctly visible and identifiable.

Required visual references per 14 CFR 91.175(c):

To descend below MDA, you must have one of the following in sight:

• Approach lighting system (if descending more than 100 feet below MDA, the red terminating bars or red side row bars must be visible)
• Threshold or threshold markings
• Threshold lights
• Runway end identifier lights (REIL)
• Visual approach slope indicator (VASI/PAPI)
• Touchdown zone or touchdown zone markings/lights
• Runway or runway markings
• Runway lights

“Distinctly visible and identifiable” means:

• You can clearly see it
• You can positively identify it as the correct runway or landing area
• You are in a position to continue to a safe landing using normal maneuvers at a normal descent rate

If you see a vague glow of lights but cannot distinctly identify the runway environment, you do not have the required visual references—execute the missed approach.

Missed approach execution:

At the MAP without visual references:

1. Immediately add power to climb power setting
2. Pitch for climb attitude (Vy or climb speed published in missed approach procedure)
3. Retract landing gear or adjust configuration as required
4. Turn to missed approach course as published
5. Advise ATC: “November One Two Three Quebec Tango is missed approach.”
6. Climb to the published missed approach altitude
7. Proceed to the missed approach holding fix or as directed by ATC

Do not delay the missed approach. Delaying causes you to fly beyond the protected airspace, compromising obstacle clearance.

Normal Landing from Straight-In Approach

When visual references are acquired at or before the MAP, and the helicopter is in a position to land safely, continue the approach.

Transition from MDA to landing:

1. Confirm runway environment: Positively identify the intended runway or landing area.
2. Continue descent: Descend at a normal rate (typically 300-500 FPM) using visual references.
3. Maintain alignment: Stay aligned with the runway centerline or landing area.
4. Adjust power and attitude: Transition smoothly from instrument flight to visual maneuvering.
5. Configure for landing: Complete landing checklist (carburetor heat if applicable, landing lights on, etc.).
6. Execute landing: Terminate at a normal landing or hover as appropriate for the landing area.

ATP standard: The landing must be smooth, controlled, and within the touchdown zone or designated landing area. No aggressive maneuvering. If the approach becomes unstable during the visual segment, execute a go-around.

Risk Management and Professional Standards

Key risk management items for ATP nonprecision approaches:

• Compliance with clearances: You must comply with all ATC clearances. If unable, advise immediately. Do not assume ATC knows your situation.
• Altitude discipline: Descending below MDA without required visual references is illegal and dangerous. Obstacle clearance below MDA is not guaranteed. ATP tolerance is -0/+50 feet—you may not bust MDA downward.
• Approach planning: Brief every approach. Know the FAF, stepdown fixes, MDA, MAP, missed approach procedure, and any special notes. Lack of planning creates workload saturation in IMC.
• Navigation vigilance: Continuously monitor navigation signals. If the CDI flag appears or GPS integrity is lost, execute the missed approach.
• Decision-making at MAP: If you don’t have the runway in sight at the MAP, go missed. Do not continue hoping it will appear. This is a professional discipline issue.
• Crew resource management (single-pilot): Use all available resources—autopilot if available, ATC assistance, electronic flight bag approach plates, GPS moving map for situational awareness. Don’t hand-fly everything to prove a point—manage workload intelligently.

Schedule

Equipment

Required References

• FAA-S-ACS-ATP (ATP Helicopter Airman Certification Standards)
• FAA-H-8083-21B (Helicopter Flying Handbook), Chapter 11 (Helicopter Instrument Flight)
• FAA-H-8083-15B (Instrument Flying Handbook), Chapters 9-10 (Navigation Systems, IFR Flight)
• 14 CFR Part 91, Subpart B (Flight Rules), §91.175 (Takeoff and Landing Under IFR)
• 14 CFR Part 61.159 (ATP Aeronautical Experience)
• Aeronautical Information Manual (AIM), Chapter 5, Section 4 (Arrival Procedures)
• AC 90-108 (Use of Suitable Area Navigation Systems on Conventional Routes and Procedures)
• Inoperative Components Table (front section of NACO or Jeppesen approach plate booklet)

Training Materials

• Current approach plates for training airport (VOR, LOC, GPS/RNAV approaches)
• Current NOTAMs for training area and airports
• IFR en route and terminal charts
• Helicopter Radar Flight Manual or POH (approach speed, configuration data)
• Approach plate briefing template or checklist
• Navigation log for approach planning

Visual Aids

• Whiteboard or chart for descent rate calculations
• Sample approach plate (enlarged) for briefing demonstration
• Diagram of protected areas for nonprecision approach segments
• MDA altitude discipline visual (showing -0/+50 tolerance)
• Missed approach procedure diagram

Aircraft and Equipment

• IFR-certified helicopter with operational navigation equipment (VOR/LOC/GPS minimum)
• Current IFR GPS database if GPS approaches will be flown
• View-limiting device (foggles or IFR hood)
• Cockpit-mounted approach plate holder
• Backup navigation equipment (handheld GPS, tablet with approach plates)

Instructor Actions

1. Begin ground lesson by reviewing ATP nonprecision approach standards from the ACS. Emphasize the critical differences from commercial standards: MDA tolerance is -0/+50 feet (not ±100), final approach tracking is quarter-scale CDI or ±5° (not half-scale), and airspeed tolerance on final is ±5 knots. Explain that these tighter tolerances reflect Part 135 professional operational requirements.

2. Discuss nonprecision approach categories available to helicopters: VOR, LOC, NDB, GPS LNAV, RNAV LNAV. Explain that LNAV+V provides advisory glidepath information but is still a nonprecision approach—emphasize that the +V is helpful but does not change the procedure or decision altitude. Demonstrate how to determine which approach type to select based on equipment, weather minimums, and operational considerations.

3. Demonstrate approach plate briefing technique using a sample VOR or LOC approach. Walk through: approach type, runway, frequencies, course, FAF, stepdown fixes, MDA, visibility minimums, MAP definition (time, DME, or fix), missed approach procedure, and notes section. Use a systematic flow: top to bottom, then profile view, then minimums, then notes. Require students to adopt a consistent briefing method.

4. Explain helicopter approach category determination. Show the student where to find approach category in the aircraft’s RFM or POH. Most helicopters use Category A (approach speed less than 91 knots). Point out the minimums table on the approach plate and show how Category A often provides lower minimums. Warn that using the wrong category can result in illegally low minimums.

5. Teach MDA and visibility adjustments. Present the Inoperative Components Table and show how to apply it. Give examples: “The approach lighting system is out of service—how does this affect minimums?” Demonstrate how to find NOTAM information (check NOTAMs, ATIS, or call flight service) and how to interpret procedural NOTAMs that affect approach minimums or procedures.

6. Demonstrate descent rate calculations for arriving stabilized at MDA. Use the formula: groundspeed × 5 = FPM for a 3-degree descent. Example: 90 knots groundspeed × 5 = 450 FPM. Explain that nonprecision approaches typically use 400-500 FPM descent rates. Show how to plan descent to arrive at MDA approximately 1 NM before the MAP, giving adequate time to acquire visual references.

7. Explain MDA discipline. Use a diagram or whiteboard to illustrate that MDA is a hard deck—you may not descend below it without required visual references. ATP standard is -0/+50 feet: you may not go below MDA, but you may go up to 50 feet above it. Explain that descending below MDA without visual references is a violation of 14 CFR 91.175 and potentially fatal due to obstacles.

8. Review required visual references per 14 CFR 91.175(c). List the approved visual references (approach lights, threshold, threshold markings, REIL, VASI/PAPI, touchdown zone, runway markings, runway lights). Emphasize “distinctly visible and identifiable”—seeing a vague glow of lights is not sufficient. Explain that if you cannot positively identify the intended runway, you must execute a missed approach.

9. Teach missed approach decision-making. Emphasize that reaching the MAP without visual references requires executing the missed approach—no exceptions. Explain the missed approach procedure: power, pitch, configure, turn, climb, communicate. Use the memory aid “5 Cs: Cram, Climb, Clean, Cool, Communicate, Course.” Stress that delaying the missed approach compromises obstacle clearance and is unprofessional.

10. Demonstrate navigation equipment setup flow. In the cockpit, show the student how to: tune and identify the primary navigation frequency, set the course in the OBS or course window, verify GPS mode and sensitivity (TERM or APPR on final), set backup navigation, and continuously monitor signal integrity. Explain that if the CDI flag appears or GPS integrity message displays, immediately execute the missed approach.

11. Explain ATC communications during approaches. Demonstrate proper read-backs of approach clearances, altitude assignments, and heading vectors. Emphasize that if you cannot comply with any clearance (e.g., unable to maintain altitude due to performance or weather), you must immediately advise ATC and request alternative instructions. Review phraseology: “Unable, November One Two Three Quebec Tango, requesting vectors for the approach” or “Unable assigned altitude, requesting higher.”

12. Brief the flight lesson plan. Explain that you will fly to the training area or airport and execute 3-4 nonprecision approaches of different types (VOR, LOC, GPS LNAV, NDB if available). Each approach will include: approach clearance acceptance, navigation setup, descent planning, MDA discipline, MAP decision-making, and either a missed approach or a normal landing. Explain that you will introduce common errors (e.g., distractions, simulated navigation failure) to test decision-making and risk management.

13. Conduct pre-flight approach briefing practice. Have the student brief one or two approaches from the plates using the systematic method you demonstrated. Correct any missed items (frequencies, courses, minimums, missed approach procedure). Require the student to calculate descent rate based on expected groundspeed and identify the MAP definition (time, DME, or fix).

14. During flight, clear the student to fly the first approach (e.g., VOR approach). Monitor altitude, heading, and course tracking closely. Before the FAF, ensure the student has completed the approach checklist, tuned and identified the navigation aid, and briefed the approach. Call out any deviations from ATP standards: “Altitude is plus 60 feet—what’s your correction?” or “CDI is approaching half-scale—what’s your action?”

15. On final approach segment, monitor tracking and descent rate. Verify the student maintains course within ±5° or quarter-scale CDI deflection. Verify airspeed is within ±5 knots of target approach speed. As the student descends to MDA, call out altitude: “One hundred above MDA… fifty above… at MDA.” Ensure the student levels precisely at MDA and does not descend below.

16. At the MAP, evaluate the student’s decision-making. If visual references are not available, verify the student immediately initiates the missed approach without hesitation. If visual references are available, verify the student confirms the runway environment, announces “runway in sight,” and continues to a normal landing. Debrief any delayed decision-making: “You reached the MAP three seconds before initiating the missed—why the delay?”

17. On subsequent approaches, introduce scenarios to test risk management and decision-making: simulated navigation failure (cover the CDI or GPS display momentarily), simulated ATC instruction to break off the approach, simulated inoperative approach lighting (raise visibility minimums), or windshear/turbulence requiring go-around. Evaluate the student’s ability to manage the situation, communicate with ATC, and execute appropriate actions.

18. Demonstrate a normal landing from a straight-in approach. Fly one approach yourself (student observes). At MDA, announce “runway in sight,” continue descent at a normal rate, maintain alignment with the centerline, and execute a smooth landing. Narrate your actions: “I have the runway environment in sight. Continuing descent, reducing power slightly, maintaining 60 knots on airspeed, tracking centerline, approaching landing area, landing.”

19. Debrief each approach immediately after execution. Ask the student: “What went well? What could be improved?” Review altitude deviations, course tracking, MDA discipline, and missed approach decision-making. Provide specific feedback: “Your course tracking was excellent on that VOR approach—within quarter-scale throughout final. Your MDA discipline was off by 70 feet high—let’s work on leveling precisely at MDA on the next approach.”

20. Conduct post-flight debrief covering all approaches flown. Review ACS completion standards and assess whether the student met ATP tolerances. Highlight strengths and identify areas requiring additional practice. Assign homework: review approach plates for the next lesson, practice descent rate calculations, and study 14 CFR 91.175 required visual references. Encourage the student: “Your tracking and decision-making are solid. We need to tighten up MDA discipline and missed approach promptness, and you’ll be at ATP standards.”

Student Actions

1. Actively participate in ground lesson by taking notes on ATP nonprecision approach standards, MDA/visibility adjustment procedures, and risk management items. Ask questions about any unclear concepts, especially descent planning, navigation setup, and missed approach criteria.

2. Review approach plates provided by the instructor and practice identifying: approach type, navigation frequencies, final approach course, FAF, stepdown fixes, MDA, visibility minimums, MAP definition, and missed approach procedure. Use the systematic briefing method demonstrated by the instructor.

3. Calculate descent rates for different groundspeeds using the formula: groundspeed × 5 = FPM. Practice mental math to quickly determine required descent rate during approach planning. Example: 80 knots = 400 FPM, 100 knots = 500 FPM.

4. Practice approach briefings using sample approach plates. Brief each approach out loud to the instructor, covering all required elements in a systematic flow. Accept feedback and correct any missed items immediately.

5. Study the Inoperative Components Table and practice adjusting minimums for inoperative approach lighting, runway lighting, or visual aids. Ask the instructor to quiz you with scenarios: “The VASI is out of service on this approach—what are your minimums now?”

6. Review 14 CFR 91.175 required visual references and memorize the list. Be prepared to explain what “distinctly visible and identifiable” means and why seeing a vague glow of lights is insufficient to descend below MDA.

7. During pre-flight briefing, plan each approach in detail: calculate descent rate, determine MAP definition, review missed approach procedure, check NOTAMs and weather, and verify navigation equipment setup. Present the plan to the instructor for approval before flight.

8. During flight, set up navigation equipment using the flow demonstrated by the instructor: tune primary frequency, identify the navigation aid, set course, verify GPS mode, set backup navigation, and monitor signal integrity throughout the approach. Call out each step: “VOR tuned and identified, course set to 270, CDI centered.”

9. Fly each approach to ATP standards: maintain altitude within ±100 feet prior to final approach segment, ±5° heading, ±10 knots airspeed. On final approach, tighten tolerances to quarter-scale CDI or ±5°, ±5 knots airspeed. Level at MDA within -0/+50 feet and maintain until MAP.

10. Make timely missed approach decisions. If required visual references are not distinctly visible at the MAP, immediately initiate the missed approach: add power, pitch for climb, configure as required, turn to missed approach course, climb to published altitude, and advise ATC. Do not delay or continue hoping to see the runway.

11. Execute normal landings from straight-in approaches when visual references are acquired. Announce “runway in sight,” continue descent at a normal rate, maintain alignment with the runway centerline, and land smoothly within the touchdown zone or designated landing area. Do not make aggressive maneuvers during the visual segment.

12. Communicate with ATC using proper phraseology and read-backs. Acknowledge approach clearances: “November One Two Three Quebec Tango is cleared for the VOR Alpha approach.” If unable to comply with any clearance, immediately advise ATC: “Unable, November One Two Three Quebec Tango” and state the reason.

13. Monitor all navigation signals continuously. Cross-check CDI against GPS position, heading indicator against compass, and altitude against trend. If the CDI flag appears, GPS integrity is lost, or navigation becomes unreliable, announce the problem to the instructor and execute a missed approach.

14. Self-critique after each approach. Assess your altitude discipline, course tracking, airspeed control, MDA level-off precision, and missed approach decision-making. Identify what you did well and what needs improvement. Ask the instructor for specific feedback.

15. Respond to instructor-introduced scenarios (simulated navigation failure, ATC instructions, weather changes) by prioritizing safety, communicating clearly, and taking appropriate action. Explain your decision-making process: “The CDI flag appeared, so I’m executing a missed approach and will notify ATC.”

16. During post-flight debrief, honestly assess your performance against ATP ACS standards. Identify specific areas where you did not meet tolerances (e.g., “I was 80 feet high at MDA on the second approach”) and commit to correcting those errors in the next lesson.

17. Complete assigned homework: review approach plates for the next lesson, study inoperative components procedures, practice descent rate calculations, and memorize required visual references per 14 CFR 91.175. Come prepared to brief approaches and answer questions.

18. Maintain professionalism throughout the lesson. Arrive prepared, be on time, have all required materials (charts, approach plates, navigation log, current NOTAMs), and demonstrate the discipline and decision-making expected of an ATP-level pilot. Treat every approach as if it were a Part 135 revenue flight with passengers aboard.

Completion Standards

The lesson is complete when the student demonstrates the knowledge, risk management, and skills required to plan and execute nonprecision instrument approaches to ATP standards as outlined in ACS task AT.VII.A. The student must meet all of the following criteria:

Knowledge Standards

1. Explains nonprecision approach procedures representative of those used in professional helicopter operations (VOR, LOC, NDB, GPS LNAV, RNAV LNAV) and describes differences between approach types, navigation equipment requirements, and lateral-only guidance characteristics.

2. Describes proper ATC communication procedures for approach segments including approach clearance acceptance, read-back requirements per 14 CFR 91.123, frequency change procedures, and phraseology for advising ATC when unable to comply with clearances.

3. Demonstrates navigation equipment setup procedures including frequency tuning, Morse code or voice identification, course setting, GPS mode verification (TERM/APPR sensitivity), and continuous monitoring of navigation signal integrity.

4. Applies adjustments to published MDA and visibility for inoperative components using the Inoperative Components Table, interprets NOTAMs (including Flight Data Center Procedural NOTAMs) affecting approach availability or minimums, determines correct helicopter approach category, and adjusts for inoperative aircraft equipment per 14 CFR 91.175 and AC 90-108.

5. Explains weather reporting factors including prevailing visibility versus RVR, conversion of RVR to statute miles, and application of weather minimums to approach decision-making.

Risk Management Standards

6. Complies with all ATC clearances or immediately advises ATC when unable to comply, stating the reason and requesting alternative instructions. Demonstrates understanding that accepting a clearance you cannot safely execute is unacceptable at ATP level.

7. Plans and maintains descent rates that ensure arrival at MDA with the helicopter stabilized and positioned to continue to a landing using normal maneuvering and normal descent rates. Calculates required descent rate using groundspeed × 5 formula and adjusts as needed for wind or performance.

8. Executes missed approaches immediately at the MAP when required visual references for the intended runway or landing area are not distinctly visible and identifiable. Demonstrates no hesitation or delay in missed approach initiation, recognizing that obstacle clearance below MDA is not guaranteed.

9. Demonstrates professional decision-making by refusing to continue unstable approaches, maintaining altitude discipline at MDA, and prioritizing safety over completion pressure. Applies crew resource management (single-pilot resource management) to manage workload, use available automation and backup systems, and maintain situational awareness.

Skill Standards (ATP Tolerances per ACS AT.VII.A)

10. Accomplishes nonprecision instrument approaches selected by the evaluator, demonstrating proficiency in VOR, localizer, GPS LNAV, and other approach types as available. Completes approach briefing prior to each approach covering all critical elements.

11. Establishes appropriate helicopter configuration and airspeed for each approach segment and completes all applicable checklist items (approach checklist, landing checklist, missed approach checklist as required). Configuration and airspeed are established prior to the final approach fix.

12. Maintains, prior to beginning final approach segment:

    • Altitude within ±100 feet of assigned altitude
    • Airspeed within ±10 knots of desired approach speed
    • Heading within ±5° of assigned headings
    • Accurately tracks radials, courses, and bearings using navigation equipment

13. Maintains, during final approach segment:

    • Course tracking within quarter-scale deflection of the CDI, or within ±5° when using RMI or bearing pointer
    • Airspeed within ±5 knots of desired approach speed (tighter tolerance than commercial)
    • Stabilized descent rate appropriate for approach conditions

14. Maintains MDA when reached:

    • Within -0/+50 feet (-0/+15 meters) to the missed approach point
    • Does not descend below MDA under any circumstances without required visual references
    • Maintains MDA precisely, demonstrating altitude discipline required for professional operations

15. Executes normal landings from straight-in approaches when visual references are acquired at or before the MAP. Landing is smooth, controlled, on centerline, within the touchdown zone or designated landing area, and demonstrates transition from instrument to visual flight without aggressive maneuvering.

The student must demonstrate consistent performance meeting these standards on at least three nonprecision approaches of different types. Any approach not meeting ATP tolerances (e.g., MDA busted low, course tracking exceeding quarter-scale, missed approach delayed) requires additional practice and re-evaluation. The instructor will document performance and identify any areas requiring remedial training before progressing to precision approaches or the ATP practical test.