Engine Limitations Flashcards
What is the MIN BATTERY voltage for engine start?
24V
What timings must be observed for starter use and engine cooling during multiple attempts at engine start?
Start attempt 1 - Starter ON (30s), Cooling down (1 min)
Start attempt 2 - Starter ON (30s), Cooling down (1 min)
Start attempt 3 - Starter ON (30s), Cooling down (30 mins)
What is the max Transient TRQ + for how long can it be at this value?
115%
10 sec
What is the max T/O Power TRQ + how long can it be at this value?
111%
5 min at T/O (cumulative per sortie)
What is the max Continuous TRQ?
92%
What is the Max Engine Start TOT?
927 degrees
Max 10 sec between 810 and 927 degrees
What is the max Transient TOT?
899 degrees
Max 6 sec over 810 degrees
What is the max T/O Power TOT?
810 degrees
5 mins at T/O (cumulative per sortie)
What is the max Continuous TOT?
752 degrees
What is the max transient limit for Propeller RPM (N2) (15 sec max above 2132 N2)?
2233 N2
What is the max continuous Propeller RPM (N2)?
2132 N2
What is the max Propeller RPM (N2) for Static Ground ops with a crosswind component >10kts?
1850 N2
relevant to the prop overspeed governor check
What is the N2 Speed Avoidance Range?
N2 stabilized for longer than 1 sec between 1523 RPM and 1786 RPM with more than 20% TRQ.
N2 must not be allowed to stabilize within the N2 speed avoidance range.
The speed avoidance range applies in both forward and reverse thrust.
Any accumulated time spend in the speed avoidance range must be recorded in the engine logbook.
What is the max transient N1 (Gas Generator RPM)?
106%
max 15 sec > 105% N1
What is the max continuous N1?
105% N1
What is the max transient Oil Pressure?
Cold Weather = 150psi
Engine Start = BETA RANGE
What is the max oil pressure?
Cold Weather = 130psi
Engine Start = BETA RANGE
What is the MIN oil pressure when N1 >= 94%?
Cold Weather = 120psi
Engine Start = 105psi
NOTE - Min permitted oil pressure DECREASES LINEARLY by 2psi per 1000ft ABOVE 5000ft PRESSURE ALTITUDE to a max reduction of 20psi.
What is the MIN oil pressure when N1 = 85% to 94%?
Cold Weather = 90psi
Engine Start = 75psi
What is the MIN oil pressure when N1 < 85%?
Cold Weather = 50psi
Engine Start = 35psi
How much does min permitted oil pressure decrease for each 1000ft above 5000ft PresAlt and what is the max reduction?
2psi per 1000ft above 5000ft PresAlt
Max reduction = 20psi
What is the engine oil temperature Max limit at TRQ < 40%?
107 degrees
What is the engine oil temperature Max Transient limit at TRQ >= 40% + for how long can it remain above the max continuous temp and below this max transient temp?
107 degrees
5 mins between 82 and 107 degrees
What is the engine oil temperature Max Continuous limit at TRQ >= 40%?
82 degrees
What is the min oil temp?
0 degrees
What is the min oil temp before starting?
-40 degrees
