TM 55-2840-254-23
Section VII. TROUBLESHOOTING
1-32 SYMPTOM INDEX
The following is a Iist of symptoms that may arise in the T55-L-712 gas turbine engine. Task and page
numbers where corrective procedures can be found are included.
PAGE
TASK
SYMPTOM
Starter Does Not Turn Engine or Cranking Speed is Slow
Engine Does Not Start - No Snapping Sound is Heard When Starting
System is Activated
No Combustion During Start Ignition System Normal - Visual Check
No Combustion During Start - Ignition System Normal
Torching Starts - Visual Check
Torching Starts
With Power Lever (N1) in Ground Idle Position, Engine Does Not Reach Ground
Idle Speed - Visual Check
With Power Lever (N1) in Ground Idle Position, Engine Does Not Reach Ground
Idle Speed
Ground Idle Speed is Incorrect - Visual Check
Ground Idle Speed is Incorrect
Torque Low at Maximum Power Lever (N1) Setting - Visual Check
Torque Low at Maximum Power Lever (N1) Setting
Torque High at Maximum Power Lever (N1) Setting
Compressor Surges or Bleed Band Popping on Acceleration
Compressor Bleed Band Remains Open
N1 Transient Overshoots - N2 Speed Cannot Be Reached - Visual Check
N1 Transient Overshoots - N2 Speed Cannot Be Reached
N2 Overshoots or Undershoots
