AOG 1 Flashcards
Caution regarding fuel source temperature
Damage to APU fuel components may occur if fuel source temperature is
greater than 57 °C (135 °F).
Note regarding when the APU is started using battery power only
When the APU is started using battery power only, there is no indication on the electrical metering panel that the APU generator has come online and is ready to be selected. Both the frequency and voltage readings are zero until the APU generator is placed online.
Note regarding APU start cycle and APU EGT indications
During the APU start cycle, the APU EGT indicationmay fluctuate from 0 to 1,100 °C prior to normal EGT rise. This indication has no adverse effect on starting the APU. It is not necessary to monitor EGT during start.
Note regarding APU FUALT light during start
APU FAULT light may momentarily illuminate during start
Note regarding indications of an APU fire warning
Flight deck fire warning bell sounds and APU fire warning horn in main wheelwell sounds
Note regarding when the APU fire extinguisher is armed
Armed only if APU fire control handle at this panel
is pulled.
Warning regarding APU failure to starting condition while fueling
If there is a protective automatic shutdown of theAPUor a failure to start condition, do not try to start the APU again during the fueling operation.
Injury to personnel or damage to equipment may occur.
-From ‘A1-P8AAA-NFM-000,’ page 376
Warning regarding fueling vehicles and APU exhaust stream
Ensure fueling vehicles are clear of APU exhaust stream. Injury to
personnel or damage to equipment may occur.
-From ‘A1-P8AAA-NFM-000,’ page 376
What are the APU intake/exhaust radius and Db levels?
15ft radius near intake
15ft radius near exhaust
85db within 15ft
75db near aft door
In flight — APU bleed plus electrical load maximum altitude _________ feet.
-From ‘A1-P8AAA-NFM-000,’ page 410
10,000 ft
Ground only — APU bleed plus electrical load maximum altitude ________ feet.
-From ‘A1-P8AAA-NFM-000,’ page 410
14,000 ft
APU bleed only maximum altitude _________ feet.
-From ‘A1-P8AAA-NFM-000,’ page 410
17,000 ft
APU electrical load only maximum altitude ________ feet.
-From ‘A1-P8AAA-NFM-000,’ page 410
41,000 ft
Warning regarding when applying external power or APU generator power
When applying external power or APU generator power, the standby
hydraulic pump can operate for approximately 4 seconds and may move the
rudder and/or thrust reversers. To prevent possible injury, ensure the rudder
and thrust reversers are clear of personnel before applying power
-From ‘A1-P8AAA-NFM-000,’ page 436
Do not try an APU start if there is
Do not try an APU start if there is ice around the hinged flap of the vortex generator. The motor for the inlet door actuator can be damaged if there is ice.
-From ‘A1-P8AAA-NFM-000,’ page 436
More regarding APU DET INOP light fails to illuminate
Do not operate the APU if the APU DET INOP light fails to illuminate.
-From ‘A1-P8AAA-NFM-000,’ page 438
Note regarding conducting APU fire detector test.
Alert ground personnel before conducting the fire detector test. During the detector test, the fire warning lights flash and the horn sounds on the ground control panel. This can be mistaken by ground crew as an APU
fire
-From ‘A1-P8AAA-NFM-000,’ page 438
Note regarding APU RUNNING light fails to illuminate by end of the start cycle
If the start fails or the APU RUNNING light fails to illuminate by the end of the start cycle, a system failure has occurred and the FAULT light illuminates.
-From ‘A1-P8AAA-NFM-000,’ page 439
Note regarding what happens when the APU EGT stabilizes
When the APU EGT stabilizes the APU RUNNING light illuminates
and the APU GEN OFF light extinguishes.
-From ‘A1-P8AAA-NFM-000,’ page 439
Note regarding how long the APU SHOULD be run prior to bleed air use
The APU should be operated for 1 minute prior to being used as a bleed
air source.
-From ‘A1-P8AAA-NFM-000,’ page 439
Condition: Fire is detected in the APU
Indications inside the aircraft
Lights, aural, CMS
Master warning light
APU fire switch
Fire bell
Fire APU (CMS)
Condition: fire is detected in the APU
Indications outside the aircraft
Lights, aural, CMS
Right main wheel well APU fire warning light
Right main week well APU fire warning horn sound
N/A (CMS)
Warning regarding the APU fire extinguisher bottle will in the event of an APU fire
The APU fire
extinguisher bottle will not automatically discharge.
Note regarding what happens when an APU malfunction occurs
The APU shuts down automatically
Note regarding a momentary FAULT light during the APU start sequence
A momentary FAULT light during the start sequence is a normal condition that does
not require action
-From ‘A1-P8AAA-NFM-000,’ page 749
Condition: An APU malfunction occurs
Lights, aural, CMS
Master caution APU FAULT Hi/lo chime N/a (CMS)
Condition: one of these occurs
- An APU rpm limit exceedance causes automatic shutdown.
- During a normal APU shutdown, the overspeed shutdown protection logic fails a self-test
-From ‘A1-P8AAA-NFM-000,’ page 749
Master caution APU Overspeed Hi/lo chime N/a CMS
Caution regarding APU DET INOP
Do not run the APU. An APU fire would not be detected and the APU would continue to
run.
-From ‘A1-P8AAA-NFM-000,’ page 750
Condition: APU fire detection is inoperative
Master caution OVHT/DET APU DET INOP Hi/lo chime N/a (CMS)
Condition: The APU is running and the APU generator is not online
Master caution
Elec
APU gen off
Note regarding normal AC voltmeter indication for the APU generator with the AC buses loaded
Normal ac voltmeter indication for the APU generator with the ac buses
loaded is 110 to 120 volts
-From ‘A1-P8AAA-NFM-000,’ page 139
Warning regarding if SPDS is in Flt Mode while on the ground
If SPDS is in Flt Mode while on the ground, inadvertent transmission of sensor and communication systems may occur which can cause injury to
personnel or damage to ground equipment.
-From ‘A1-P8AAA-NFM-000,’ page 464
Caution regarding cooling air from the ECS Draw-Thru system
Cooling air from the ECS Draw-Thru system is required whenever electrical power is applied to mission equipment. Powering mission equipment before the ECS Draw-Thru system is operational may result in equipment damage.
-From ‘A1-P8AAA-NFM-000,’ page 464
Caution regarding Draw-Thru system being on and trying to conduct the alarm test
If the ECSDraw-Thru systemis already operational and powered ON, power should not be secured to the system in order to conduct the alarm test, and the operator may skip the alarm test.
-From ‘A1-P8AAA-NFM-000,’ page 464
Note regarding APU FAULT light
Light may illuminate momentarily during the normal start sequence.
Caution regarding operating the APU with low oil
Do not operate the APU with a LOW oil level reading. Damage to the APU may result.
