AC 27-1B, 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 28-00-00 - FUEL Failure Phase of Effect of the Failure on Classification Notes Supporting Verification ATA Function Condition Operation the Aircraft, Crew and of the FC (assumptions) Material Method Description (FC) Occupants 2843 Fuel Loss of fuel ALL A slight reduction of Analysis and Temperature temp safety margin due to Test Indicator indication. indication to the cockpit and the limited exposure of the failure condition.
Misleading ALL A large reduction in safety Analysis and fuel temp. margins or functional Test capabilities.
ATA 29-00-00 - HYDRAULIC POWER Failure Phase of Effect of the Failure on Classification Notes Supporting Verification ATA Function Description (FC) Condition Operation the Aircraft, Crew and Occupants of the FC (assumptions) Material Method 29-10 Hydraulic Loss of ALL A slight reduction of Analysis and System, Main hydraulic safety margin due to Text pressure. indication to the cockpit and the limited exposure of the failure condition.
A significant increase in pilot workload that tasks, such as precision flight, cannot be accurately conducted.
Figure AC 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 26
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 Failure Phase of Effect of the Failure on Classification Notes Supportin Verification ATA Function Condition Operation the Aircraft, Crew and of the FC (assumptions) g Material Method Description (FC) Occupants 3416 Altimeter Total loss of ALL Aircrew workload Analysis and ALL altitude increases to a level at Test indication in which continued safe IFR. flight and landing is not guaranteed due to unknown height above the ground; no external cues.
Total loss of ALL Aircrew workload ALL altitude substantially increases indication in due to unknown height night VFR. above the ground; low external cues.
Misleading ALL Aircrew workload Analysis and indication increases to a level at Test and/or which continued safe malfunction flight and landing is not of the guaranteed due to altitude in unknown height above IFR. the ground; no external cues.
Figure AC 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 27
AC 27-1B, 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 Failure Phase of Effect of the Failure on Classification Notes Supportin Verification ATA Function Description (FC) Condition Operation the Aircraft, Crew and Occupants of the FC (assumptions) g Material Method Misleading ALL Aircrew workload Analysis and indication increases to a level at Test and/or which continued safe malfunction flight and landing is not of the guaranteed due to altitude unknown height above indication in the ground; no indication night VFR. to use external cues.
3414 Airspeed Total loss of ALL The reduction in safety Analysis Indicator ALL airspeed margins and functional indication in capability in the system IFR. may prohibit continued safe flight and landing.
Total loss of ALL The loss of critical Analysis and ALL airspeed information will result in Test indication in a large reduction in VFR - night. 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.
Figure AC 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 28
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 Failure Phase of Effect of the Failure on Classification Notes Supportin Verification ATA Function Condition Operation the Aircraft, Crew and of the FC (assumptions) g Material Method Description (FC) Occupants Misleading ALL Aircrew workload may Analysis and indication increase to a level such Test and/or that they could not be malfunction relied upon to perform of the tasks accurately or airspeed in completely.
IFR.
Misleading ALL Aircrew workload may Analysis and indication increase to a level such Test and/or that they could not be malfunction relied upon to perform of the tasks accurately or airspeed in completely.
VFR - night.
3421 Attitude Total loss of ALL The reduction in safety Analysis ALL attitude margins and functional indication in capability in the system IFR. may prohibit continued safe flight and landing.
Total loss of ALL Aircrew workload may Analysis and ALL attitude increase to a level such Test indication in that they could not be VFR - night. relied upon to perform tasks accurately or completely.
Figure AC 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 29
AC 27-1B, 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 Failure Phase of Effect of the Failure on Classification Notes Supportin Verification ATA Function Condition Operation the Aircraft, Crew and of the FC (assumptions) g Material Method Description (FC) Occupants Misleading ALL The reduction in safety Analysis indication margins and functional and/or capability in the system malfunction may prohibit continued of attitude in safe flight and landing.
IFR.
Misleading ALL Aircrew workload may Analysis and indication increase to a level such Test and/or that they could not be malfunction relied upon to perform of attitude in tasks accurately or VFR - night. completely.
3420 Heading Total loss of ALL Aircrew workload Analysis and ALL heading significantly increases Test indication in due to utilizing alternate IFR. methods to determine heading (NAV radios, ATC assistance, etc.).
Total loss of ALL Aircrew workload Analysis and ALL heading significantly increases Test indication in due to utilizing alternate VFR - night. methods to determine heading (NAV radios, ATC assistance, etc.).
Figure AC 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 30
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 Failure Phase of Effect of the Failure on Classification Supportin Verification ATA Function Condition Operation the Aircraft, Crew and of the FC (assumptions) g Material Method Description (FC) Occupants Misleading ALL Aircrew workload Analysis and indication substantially increases to Test and/or a level at which the crew malfunction cannot accurately of the complete tasks due to heading in utilizing alternate IFR. methods to determine heading (NAV radios, ATC assistance, etc.).
Misleading ALL Aircrew workload Analysis and indication substantially increases to Test and/or a level at which the crew malfunction cannot accurately of the complete tasks due to heading in utilizing alternate VFR - night. methods to determine heading (NAV radios, ATC assistance, etc.).
3400 Navigation Total loss of ALL Aircrew workload Analysis System all navigation significantly increases to information a level at which the crew in IFR. cannot accurately complete tasks.
Total loss of ALL Aircrew workload all navigation significantly increases to information a level at which the crew in VFR - cannot accurately night. complete tasks.
Figure AC 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 31
AC 27-1B, 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 Failure Phase of Effect of the Failure on Classification Notes Supportin Verification ATA Function Condition Operation the Aircraft, Crew and of the FC (assumptions) g Material Method Description (FC) Occupants Misleading ALL Continued safe flight is Analysis and indication not guaranteed due to Test and/or misleading navigation malfunction information resulting in of the terrain or obstacle navigation in impact.
IFR.
Misleading ALL Continued safe flight is Analysis and indication not guaranteed due to Test and/or misleading navigation malfunction information resulting in of the terrain or obstacle navigation in impact.
VFR - night.
Figure AC 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 32
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 Effect of the Failure on Classification Supporting Verification Function ATA Condition Operation the Aircraft, Crew and of the FC (assumptions) Material Method Description Occupants 6310 Engine/ Transmission Coupling Provide torque Loss of TO Aircrew workload Analysis and and rotational engine to increases substantially Test speed to the transmission such that tasks cannot be rotor shaft (coupling) completed accurately.
drive (single Aircrew must conduct engine). an autorotation.
Loss of TO Aircrew workload Analysis and engine to substantially increases to Test transmission handle an OEI (coupling) condition.
drive (dual engine).
Loss of TO Continued safe flight is Analysis and engine not guaranteed due to Test coupling seizure of free wheeling and loss of clutch results in loss of input MR rpm. Leads to module free- uncontrolled flight (no wheeling auto-rotation clutch capability.).
(single & dual engine).
6320 Main Rotor Gearbox Figure AC 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 33
AC 27-1B, 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 Failure Phase of Effect of the Failure on Classification Notes Supporting Verification ATA Function Description (FC) Condition Operation Occupants the Aircraft, Crew and of the FC (assumptions) Material Method Provide torque Loss of Cruise Aircrew workload Analysis and and rotational lubrication increases substantially Test speed to the to main due to the need to rotor shaft. transmission conduct a landing as soon as possible.
6321 Main Rotor Brake Provide Inadvertent ALL Continued safe flight is Analysis and braking to the activation of not guaranteed. For Test rotor rotor instance, engagement of braking the braking pad during system high power to the main during rotor could create a fire.
flight.
6340 Rotor Drive Indicating System Provide MGB Failure of ALL Continued safe flight Analysis and chip detection chip and landing is not Test detector guaranteed due to the system to degradation of gears detect and below the required load annunciate capability.
the existence of chips.
Figure AC 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 34
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 Failure Condition Phase of Operation the Aircraft, Crew and Effect of the Failure on of the FC Classification Notes (assumptions) Supporting Material Method Verification Description (FC) Occupants 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 annuncia- in safety margins would Test tion of low exist due to the delayed oil 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 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 35
AC 27-1B, 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 Failure Phase of Effect of the Failure on Classification Notes Supporting Verification ATA Function Condition Operation the Aircraft, Crew and of the FC (assumptions) Material Method Description (FC) Occupants Loss of oil ALL Large reduction in the Analysis and pressure aircraft safety margin; Test indication cannot determine if and low oil adequate oil pressure is pressure present. Secondary cues warning. 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 ALL Significant reduction in Analysis and oil 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.
Figure AC 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 36
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 Failure Phase of Effect of the Failure on Classification Notes Supporting Verification ATA Function Condition Operation the Aircraft, Crew and of the FC (assumptions) Material Method Description (FC) Occupants Misleading ALL Continued safe flight is Analysis oil pressure not guaranteed due to indication loss of all indications of and loss of MGB oil pressure loss low oil and ensuing gearbox pressure seizure.
warning.
Provide Nr Loss of ALL Slight increase in Analysis indication rotor RPM aircrew workload due to and/or Test (Nr) the need to monitor indication. secondary engine instruments.
Figure AC 27 MG 21-1. Generic Examples by ATA.
Page MG 21 - 37