Powerplant Limitations - CFM56

Question 1

CFM Thrust Setting/EGT Limits

Answer 1

TOGA (2 engine) - 5 min - 950 °C
TOGA (1 engine) - 10 min - 950 °C
MCT (1 or 2 engine) - N/A - 915 °C
Starting (ground / air) - 725 °C

Question 2

CFM Maximum N1 and Maximum N2

Answer 2

104% N1
105% N2

Question 3

CFM Oil temperature limitations

Answer 3

Maximum temperature = 140 °C
Maximum transient (15 min) = 155 °C
Minimum starting temp = -40 °C
Minimum before takeoff = -10 °C

Question 4

CFM Oil quantity limitations

Answer 4

9,5 qt + estimated consumption (0,5 qt/h)

Question 5

CFM Starter limitations

Answer 5

*1 cycle = standard automatic start up to 3 start attempts
*For ground starts, a 20-second pause is required between successive cycles
*4 failed cycles = 15 min cooling period
*Starter must not be run when N2 > 20 %

Question 6

CFM Reverse thrust limitations

Answer 6

*Selection of reverse thrust is prohibited in flight
*Backing the aircraft with the use of reverse thrust is not permitted
*Maximum reverse should not be used below 70 kt
*Idle reverse is permitted down to aircraft stop