Engine Limitations Flashcards
Min battery voltage for engine start
24V
Engine start attempt sequence
Attempt 1: ON (30s), cooling down (1 min)
Attempt 2: ON (30s), cooling down (1 min)
Attempt 3: ON (30s), cooling down (30 mins)
Max transient TRQ (10 sec)
115%
Max T/O Power TRQ
(5 min at T/O) (cumulative per sortie) 111%
Max continuous TRQ
92%
Max engine start TOT (10 sec over 810°C)
927°C
Max transient TOT (6 sec over 810°C)
899°C
Max T/O power TOT (5 min at T/O) (cumulative per sortie)
810°C
Max continuous TOT
752°C
N2 Max transient limit (15 sec max above 2132 N2)
2233 N2
N2 max continuous speed
2132 N2
N2 Max static ground ops with crosswind component >10kts (this is relevant to the propeller overspeed governor check)
1850 N2
N2 Speed avoidance range
1523-1786 N2
Details of N2 speed avoidance range
N2 must not be allowed to stabilise in the speed avoidance range
Applies in both forward and reverse thrust
Operation within the speed avoidance range is permitted for pre-flight, post-flight checks and taxy
If the speed avoidance range is breached on the ground or in flight, no maintenance action is required
Max transient N1 (max 15 sec > 105% N1)
106% N1
Max continuous N1
105% N1
Max transient oil pressure for cold weather/ engine start
150psi
Max oil pressure
130psi
Min oil pressure at N1 at or above 94%
120psi / 105psi (beta range)
Min oil pressure at N1 85% to 94%
90 psi / 75psi beta range
Min oil pressure at N1 < 85%
50psi / 35psi (beta range)
Oil pressure limitation note
Min permitted oil pressure decreases linearly by 2 psi for each 1000ft above 5000ft pressure altitude to a max reduction of 20 psi
Max oil temperature limit at TRQ < 40%
107°C
Max transient oil temperature at TRQ at or above 40% (5 min)
107°C
Max continuous oil temperature at TRQ at or above 40%
82°C
Min oil temp
0°C
Min oil temp before starting
-40ºC
