AC 29-2C, Chg 7 2/4/2016 Note: Not all ATA chapters or subchapters have been included. Also, the italicized entries are not usually included in the failure condition description but in the systems description or assumptions section.
ATA 34-00-00 - NAVIGATION ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method 3416 Altimeter Total loss of ALL altitude indication in IFR.
ALL Aircrew workload increases to a level at which continued safe flight and landing is not guaranteed due to unknown height above the ground; no external cues.
Analysis and Test Total loss of ALL altitude indication in night VFR.
ALL Aircrew workload substantially increases due to unknown height above the ground; low external cues.
Misleading indication and/or malfunction of the altitude in IFR.
ALL Aircrew workload increases to a level at which continued safe flight and landing is not guaranteed due to unknown height above the ground; no external cues.
Analysis and Test Figure AC 29 MG 21-1. Generic Examples by ATA.
Page MG 21 - 28
ATA 34-00-00 - NAVIGATION ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method Misleading indication and/or malfunction of the altitude indication in night VFR.
ALL Aircrew workload increases to a level at which continued safe flight and landing is not guaranteed due to unknown height above the ground; no indication to use external cues.
Analysis and Test 3414 Airspeed Indicator Total loss of ALL airspeed indication in IFR.
ALL The reduction in safety margins and functional capability in the system may prohibit continued safe flight and landing.
Analysis Total loss of ALL airspeed indication in VFR – night.
ALL The loss of critical information will result in a large reduction in safety margins and functional capability.
Aircrew workload may increase to a level such that they could not be relied upon to perform tasks accurately or completely.
Analysis and Test Figure AC 29 MG 21-1. Generic Examples by ATA.
Page MG 21 - 29
AC 29-2C, Chg 7 2/4/2016 Note: Not all ATA chapters or subchapters have been included. Also, the italicized entries are not usually included in the failure co ndition description but in the systems description or assumptions section.
ATA 34-00-00 - NAVIGATION ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method Misleading indication and/or malfunction of the airspeed in IFR.
ALL Aircrew workload may increase to a level such that they could not be relied upon to perform tasks accurately or completely.
Analysis and Test Misleading indication and/or malfunction of the airspeed in VFR – night.
ALL Aircrew workload may increase to a level such that they could not be relied upon to perform tasks accurately or completely.
Analysis and Test 3421 Attitude Total loss of ALL attitude indication in IFR.
ALL The reduction in safety margins and functional capability in the system may prohibit continued safe flight and landing.
Analysis Total loss of ALL attitude indication in VFR – night.
ALL Aircrew workload may increase to a level such that they could not be relied upon to perform tasks accurately or completely.
Analysis and Test Figure AC 29 MG 21-1. Generic Examples by ATA.
Page MG 21 - 30
ATA 34-00-00 - NAVIGATION ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method Misleading indication and/or malfunction of attitude in IFR.
ALL The reduction in safety margins and functional capability in the system may prohibit continued safe flight and landing.
Analysis Misleading indication and/or malfunction of attitude in VFR – night.
ALL Aircrew workload may increase to a level such that they could not be relied upon to perform tasks accurately or completely.
Analysis and Test 3420 Heading Total loss of ALL heading indication in IFR.
ALL Aircrew workload significantly increases due to utilizing alternate methods to determine heading (NAV radios, ATC assistance, etc.)
Analysis and Test Total loss of ALL heading indication in VFR – night.
ALL Aircrew workload significantly increases due to utilizing alternate methods to determine heading (NAV radios, ATC assistance, etc.)
Analysis and Test Figure AC 29 MG 21-1. Generic Examples by ATA.
Page MG 21 - 31
AC 29-2C, Chg 7 2/4/2016 Note: Not all ATA chapters or subchapters have been included. Also, the italicized entries are not usually included in the failure condition description but in the systems description or assumptions section.
ATA 34-00-00 - NAVIGATION ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method Misleading indication and/or malfunction of the heading in IFR.
ALL Aircrew workload substantially increases to a level at which the crew cannot accurately complete tasks due to utilizing alternate methods to determine heading (NAV radios, ATC assistance, etc.).
Analysis and Test Misleading indication and/or malfunction of the heading in VFR – night.
ALL Aircrew workload substantially increases to a level at which the crew cannot accurately complete tasks due to utilizing alternate methods to determine heading (NAV radios, ATC assistance, etc.).
Analysis and Test 3400 Navigation System Total loss of all navigation information in IFR.
ALL Aircrew workload significantly increases to a level at which the crew cannot accurately complete tasks.
Analysis Total loss of all navigation information in VFR – night.
ALL Aircrew workload significantly increases to a level at which the crew cannot accurately complete tasks.
Figure AC 29 MG 21-1. Generic Examples by ATA.
Page MG 21 - 32
ATA 34-00-00 - NAVIGATION ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method Misleading indication and/or malfunction of the navigation in IFR.
ALL Continued safe flight is not guaranteed due to misleading navigation information resulting in terrain or obstacle impact.
Analysis and Test Misleading indication and/or malfunction of the navigation in VFR – night.
ALL Continued safe flight is not guaranteed due to misleading navigation information resulting in terrain or obstacle impact.
Analysis and Test Figure AC 29 MG 21-1. Generic Examples by ATA.
Page MG 21 - 33
AC 29-2C, Chg 7 2/4/2016 Note: Not all ATA chapters or subchapters have been included. Also, the italicized entries are not usually included in the failure condition description but in the systems description or assumptions section.
ATA 63-00-00 – MAIN ROTOR DRIVE ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method 6310 Engine/ Transmission Coupling Provide torque Loss of engine TO Aircrew workload Analysis and and rotational to increases substantially Test speed to the transmission such that tasks cannot rotor shaft (coupling) drive (single engine).
be completed accurately. Aircrew must conduct an autorotation.
Loss of engine to transmission (coupling) drive (dual engine).
TO Aircrew workload substantially increases to handle an OEI condition.
Analysis and Test Loss of engine TO Continued safe flight is Analysis and coupling and not guaranteed due to Test loss of input seizure of free wheeling module free- clutch results in loss of wheeling MR rpm. Leads to clutch (single uncontrolled flight (no & dual auto-rotation engine). capability.).
Figure AC 29 MG 21-1. Generic Examples by ATA.
Page MG 21 - 34
ATA 63-00-00 – MAIN ROTOR DRIVE ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method 6320 Main Rotor Gearbox Provide torque and rotational speed to the rotor shaft.
Loss of lubrication to main transmission.
Cruise Aircrew workload increases substantially due to the need to conduct a landing as soon as possible.
Analysis and Test 6321 Main Rotor Brake Provide braking to the rotor Inadvertent activation of rotor braking system during flight.
ALL Continued safe flight is not guaranteed. For instance, engagement of the braking pad during high power to the main rotor could create a fire.
Analysis and Test 6340 Rotor Drive Indicating System Provide MGB chip detection Failure of chip detector system to detect and annunciate the existence of chips.
ALL Continued safe flight and landing is not guaranteed due to the degradation of gears below the required load capability.
Analysis and Test Figure AC 29 MG 21-1. Generic Examples by ATA.
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AC 29-2C, Chg 7 2/4/2016 Note: Not all ATA chapters or subchapters have been included. Also, the italicized entries are not usually included in the failure condition description but in the systems description or assumptions section.
ATA 63-00-00 – MAIN ROTOR DRIVE ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method Provide MGB Loss of oil ALL A significant reduction Analysis and oil pressure pressure in safety margins would Test indication indication. exist due to the possible delay in crew action to an actual loss of oil.
Aircrew workload increases slightly due to changing the planned flight and the monitoring of secondary indications.
Erroneous ALL A substantial reduction Analysis and annunciation in safety margins would Test of low oil exist due to the delayed pressure reaction of the crew to warning. an actual loss of oil.
Slight increase in aircrew workload due to conflicting low oil pressure warning and oil pressure indicator.
Figure AC 29 MG 21-1. Generic Examples by ATA.
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ATA 63-00-00 – MAIN ROTOR DRIVE ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method Loss of oil ALL Large reduction in the Analysis and pressure aircraft safety margin; Test indication and cannot determine if low oil adequate oil pressure is pressure present. Secondary warning. cues may be present to pilot (Increase oil temperature, vibration and noise levels, in case of actual loss of MGB oil).
Substantial increase in aircrew workload.
Misleading oil ALL Significant reduction in Analysis and pressure the aircraft safety Test indication. margin due to erroneous oil pressure indication (reads normal but actual oil pressure is low).
Substantial increase in aircrew workload.
Misleading oil ALL Continued safe flight is Analysis pressure not guaranteed due to indication and loss of all indications of loss of low oil MGB oil pressure loss pressure and ensuing gearbox warning. seizure.
Figure AC 29 MG 21-1. Generic Examples by ATA.
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AC 29-2C, Chg 7 2/4/2016 Note: Not all ATA chapters or subchapters have been included. Also, the italicized entries are not usually included in the failure condition description but in the systems description or assumptions section.
ATA 63-00-00 – MAIN ROTOR DRIVE ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method Provide Nr indication Loss of rotor RPM (Nr) indication.
ALL Slight increase in aircrew workload due to the need to monitor secondary engine instruments.
Analysis and/or Test Figure AC 29 MG 21-1. Generic Examples by ATA.
Page MG 21 - 38
ATA 73-00-00 - ENGINE FUEL AND CONTROL ATA Function Description Failure Condition (FC) Phase of Operation Effect of the Failure on the Aircraft, Crew and Occupants Classification of the FC Notes (assumptions) Supporting Material Verification Method 7331 Fuel Flow Indicating Loss of fuel flow.
ALL The reduction in safety margins and functional capability in the system may prohibit continued safe flight and landing.
Analysis Malfunction and loss of fuel flow indication.
ALL The failure can delay crew action long enough to prevent continued safe flight and landing.
Analysis Misleading fuel flow alert failed.
ALL A large reduction in safety margins or functional capabilities.
Analysis 7332 Fuel Pressure Indicating Loss of fuel pressure.
ALL The reduction in safety margins and functional capability in the system may prohibit continued safe flight and landing.
Analysis Malfunction and loss of fuel pressure indication.
ALL A combination of a malfunction with a loss of indication in the system can delay crew action long enough causing a large reduction in safety margins or functional capabilities.
Analysis and Test Figure AC 29 MG 21-1. Generic Examples by ATA.
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