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APU Study III

APU Study- LM1 & LM2

QuestionAnswer
Ensure lower engine bay doors are WHAT prior to APU start? Closed
If WHAT aural tone sounds, terminate APU run. Damage can occur due to ECS overheat MLG UNSAFE
Ext power and air are NOT used in WHAT? and WHAT? LM1 and LM2
Do not operate APU for longer than WHAT? without ELEC power at temperatures above 0 degrees 5 minutes
APU start is WHAT? if APU does not reach 95% RPM within 40 seconds. (APU run light will illuminate at 95% EPM) start shut down 15 seconds
ADG will couple within 6 seconds at temperatures above WHAT? 30 degrees
Ensure people and equipment are clear of moving surfaces prior to applying WHAT? hydraulic pressure
Operate APU minimum of WHAT before coupling to ADG to ensure APU pol pressure and EGT stabilization 5 minutes