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APU Study V

APU Study- LM4 (External Power, NO External AIR)

QuestionAnswer
Ensure lower WHAT are clsoed prior to APU start? Lower Engine Bay Doors
Monitor coolant temperatures to prevent damage to WHAT and WHAT? Electronics and Aircraft
External air is not used in LM4 external power no WHAT? External Air
WHAT? is used in LM4 external power no external air External Power
A bleed air cart can be used to augment cooling in the event WHAT exceeds limits. Coolant Temperatures
Engine SCDU can only be powered in WHAT intervals by placing ENG INST TEST switch to LOW or HIGH for approximately 5 seconds 2-minute
Do NOT connect WHAT to Aircraft with known APU load control valve fault Blled Air Cart
Use of bleed air cart is not mandatory; however, it is required for continued operations when the coolant temperature has reached WHAT? 90 Degrees
The WHAT is activated by the engine bleed air switches? Bleed Air Leak Detection System
If external bleed air cart is being used, WHAT may be set to CREW? AIR SOURCE CREW
Do not operate APU for longer than WHAT without ELEC power at temperatures above 0 degrees 5 minutes
APU start time is WHAT? If APU does not reach WHAT within WHAT? (APU run light will illuminate at 95% PRM) start shut down -15 Seconds -95% RPM -40 Seconds
ADG will couple withint WHAT? at temperatures above WHAT? - 6 Seconds - 30 Degrees
ADG will couple withint WHAT at temperatures below WHAT? - 20 seconds - 30 Degrees
Ensure people and equipment are clear of WHAT prior to applying hydraulic pressure Moving Surfaces
Operate APU a minimum of 30 seconds before WHAT to ADG to ensure APU oil pressure and EGT stabilization Coupling
ACL coolant temperatures exceed WHAT stop operations 90 Degrees
If WHAT coolant temperatures exceed 90 degrees stop operations ACL
PMCs for fuel inlet temperature will be WHAT during operations. If temperatures start to increase xferring fuel between tanks may decrease fuel temperature. Monitored
If fuel inlet temperature exceeds WHAT degrees stop operations. 165 Degree
 

 



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