Engine Limitations Flashcards
(25 cards)
Min battery voltage for engine start
24V
Engine Start Limitations
Start attempts
Start attempt 1
- Starter ON 30 sec
- Cooling Down 1 min
Start attempt 2
- Starter ON 30 sec
- Cooling Down 1 min
Start attempt 3
- Starter ON 30 sec
- 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
Propeller RPM (N2)
Max Transient Limit (15 sec max above 2132 N2)
2233 N2
Propeller RPM (N2)
Max Continuous Speed
2132 N2
Propeller RPM (N2)
Max Static Ground Ops with Crosswind component > 10 kts
This is relevant to the Propeller Overspeed Governor Check
1850 N2
Propeller RPM (N2)
Speed Avoidance Range
1532-1786 N2
- N2 must not be allowed to stabilize within the Speed Avoidance Range
- The Speed Avoidance Range applies when 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
Gas Generator RPM (N1)
Max Transient N1 (max 15 sec > 105% N1)
106% N1
Gas Generator RPM (N1)
Max Continuous N1
105% N1
Oil Pressure
Max Transient (cold weather/engine start)
150 psi
BETA RANGE
Oil Pressure
Max
130 psi
BETA RANGE
Oil Pressure
Min at N1… ≥ 94%
120 psi
105 psi
Note: Min permitted oil pressure decreases linearly by 2 psi for each 1000 ft above 5000 ft pressure altitude to a max reduction of 20 psi
Oil Pressure
Min at N1… 85% to 94%
90 psi
75 psi
Oil Pressure
Min at N1… < 85%
50 psi
35 psi
Oil Temperature
Max Limit at TRQ… < 40%
107°C
Oil Temperature
Max Transient at TRQ ≥ 40% (5 min)
107°C
Oil Temperature
Max Continuous at TRQ ≥ 40%
82°C
Oil Temperature
Min Temp
0°C
