Ops Limits Flashcards
(121 cards)
Continuous RPM for APU
100 +/- 3
Continuous EGT for APU
200-715 *C
APU Starting EGT Limit
Below 60% RPM, the EGT can peak as high as 980 for 2 seconds
APU starting an engine EGT limit
When starting an engine, the APU EGT can peak as high as 760*C for 2 seconds
Unsuccessful APU start limits
- RPM doesn’t exceed 60% within 30 seconds
- EGT doesn’t decrease to normal limits once RPM past 60%
APU cooldown after unsuccessful start
Wait 1 minute between attempts. Maximum 3 attempts, then wait 20 minutes to cool down
APU cooldown after successful (air) start
wait 2 minutes after APU shutdown
APU cooldown after successful (ground) start
Wait 10 minutes after initiation of successful start attempts (switch placed in start)
How long after engine start or motoring (loaded) must the APU run unloaded for prior to shutdown?
2 minutes
APU will start up to ____’ (in most cases ____’)
15,000’, in most cases 20,000’
APU will power enough bleed air to start engines as high as ____’ (in most cases ____’)
10,000’, in most cases 15,000’
APU overspeed protection provided at ___ +/- ___%
110 +/- 3%
Do not operate the APU for more than ___ minutes with APU Generator OFF
5
The APU will operate for approx ____ seconds during negative G conditions
10
The APU overtemp shutdown is disabled during ground engine start cycle plus ___ seconds
4
Engine ITT normal range
275-865 *C
Engine ITT malfunction if stabilized above ___. Up to ___ allowable for ___ seconds during starting or acceleration
865, 900 allowable for 12 seconds
Engine Hot light comes on at ___
880 *C
Max IDLE ITT is ___
675 *C
Engine Core RPM normal range
56-100%
Engine Core RPM ___-___ allowable for ___ seconds. Never over ___
100-102 allowable for 3 seconds. Never over 102%
Engine Fan RPM normal range
22-98%
Engine Fan RPM ___-___ steady state indicates malfunction
98-100%
Write up engine if fan speed is __% low
2%