Engine Parameters Limitations Flashcards
Engine Idle Parameters
20%N1
60%N2
400°C EGT
300Kg/h FF
Maximum EGT for engine start in ground or in flight (CFM56)
725°C
Maximum EGT for engine start in ground or in flight (IAE)
635ºC
Maximum EGT for engine start in ground or in flight (P&W)
1083ºC
TOGA/FLEX Time limit for Take Off or Go Around with all Engines Operating
5 minutes
TOGA/FLEX Time Limit with One Engine Inoperative during Take-off or Go Around
10 minutes
Maximum EGT for Take-off or Go Around (CFM56)
950°C
Maximum EGT for Take-off or Go Around (IAE)
635ºC/650ºC
Maximum EGT for Take-off or Go Around (P&W)
1083ºC
Maximum EGT on thrust MCT (CFM56)
915°C
Maximum EGT on thrust MCT (IAE)
610ºC
Maximum EGT on thrust MCT (P&W)
1043ºC
Maximum N1 value (CFM56)
104%
Maximum N1 value (IAE)
100%
Maximum N1 value (P&W)
100% in normal operation, 105% maximum permitted
Maximum N2 Value (CFM56)
105%
Maximum N2 Value (IAE)
100%
Maximum N2 Value (P&W)
100% in normal operation, 105% maximum permitted
How many start attempts are considered a cycle? (CFM56)
3 start attempts are considered a cycle
How many start attempts are considered a cycle? (IAE)
1 start attempt is considered a cycle
How many start attempts are considered a cycle? (P&W)
2 start attempts are considered a cycle
How much time is required between 2 consecutive cycles? (CFM56)
20 seconds
How much time is required between 2 consecutive cycles? (IAE)
15 seconds
How much time is required between 2 consecutive cycles? (P&W)
35 seconds
Until which speed can we use Max Reverse?
70kts
Until which speed can we use reverse Idle?
Until stopping on the ground
Is it allowed to go back with reversers on the ground?
No, it’s not allowed
Is reverse thrust allowed in flight?
No, it’s not allowed in flight
After 4 failed start cycles, the cooling period required is… (CFM56)
15 minutes
After 3 failed start cycles, the cooling period required is… (IAE)
30 minutes or 4 minutes of continuous crank or 5 minutes of cumulated crank
After 3 failed start cycles, the cooling period required is… (P&W)
15 minutes or 15 minutes of continuous or cumulated crank
When must the starter not be used? (CFM56)
When N2 is above 20%
When must the starter not be used? (IAE)
When N2 is above 10% on ground and 18% in-flight
When must the starter not be used? (P&W)
When N2 is above 20%
Maximum crosswind for engine start: (P&W and IAE)
35kts
When does the engines warm-up period before take-off starts?
When the engine reaches it’s idle parameters (When AVAIL is displayed)
