Engine Malfunction Indications

Question 1

Engine High-side Failure in flight

Answer 1

All of the following conditions exist:

1. TRQ is 10% or greater than other engine
2. Ng is 5% or greater than other engine
3. Np is matched with in 5% of other engine
4. Nr is at or above 103%

Question 2

Engine low-side Failure

Answer 2

All of the following conditions exist:

1. Torque is 10% below the good engine.
2. Ng it’s 5% or less than the good engine
3. Np is at or below 98%
4. Nr is at or below 97%

Question 3

Engine Torque or TGT Spiking/fluctuations

Answer 3

Differences between engine torques is greater than 10%.

Question 4

Compressor Stall

Answer 4

Rapid increase in TGT, hang up or decrease in NG, loss of power, or change in engine noise level varying from barely audible to muffled explosions.

Question 5

Engine High-Speed Shaft Failure

Answer 5

NP is greater than an NR by more than 3% and engine torque is below 10%.