CHECK FOR SUSPECTED COMPRESSOR STALL
Powerplant Repairers Tool Kit, NSN
TM 55-2840-254-23 Without 74
TM 1-2840-265-23 With 74
Battery Disconnected (Task 1-39)
Electrical Power Off
Engine Work Platform Open (Task 2-2)
Engine Access Cover Open (Task 4-49)
Procedure is same to check No.
1 or No. 2 engine for suspected
Determine circumstances at time of suspected
Check aircraft and engine log for any history
relating to reported stall.
Determine N1 speed at time of reported stall.
Check compressor rotor blades and stators (TM
55-2840-254-23 without 74 , TM 1-2840-265-23
with 74 ).
For engines without 74 , if stall occurs during
starting when rotor rpm is 35 to 42 percent or
N2 is below 50 percent, do the following:
Perform operational check of fairing hot air
valve (TM 55-1520-240-T without 74 ).
Adjust bleed band, bleed band actuator, and
fuel control (TM 55-2840-254-23 without 74 ).
For engines with 74 , perform a compressor stall
inspection (TM 1-2840-265-23 with 74 ).
Close engine access cover (Task 4-50).
Close engine work platform (Task 2-2).
END OF TASK