4-1.1 ENGINE PERFORMANCE CHECK OPERATIONAL CHECK
(Continued)
TASK
RESULT
1. Have pilot start NO. 1 engine and stabilize at
If NO. 1 engine N1 CONT. caution light (1), does
ground idle.
not come on, go to task 4-5.3.
If engine does not motor, go to task 4-4.4.
If engine NO. 1 STARTER ON Iight (2) does not
come on, go to task 4-4.4.
If engine motors normally but does not start, go to
task 4-4.4.
If engine oil pressure indicator (3) does not indi-
cate oil pressure, go to task 8-3.3.
If engine oil pressure IS below 20 psi, go to task 8-
3.3.
If gas producer tachometer (4) does not indicate
rpm, go to task 8-2.3.
If PTIT Indicator (5) does not Indicate temperature,
go to task 8-5.3.
If PTIT indicator is high or hot start occurs, go to
task 4-1.2.
If copilots rotor tachometer (6) does not indicate
rpm, go to task 8-15.3.
2. Check NO. 1 engine ground idle speed after
If gas producer tachometer (4) does not indicate
45 seconds.
between 60 and 63 percent rpm, go to task 4-1.3.
TM 55-1520-240-T
4-1.1
TASK
RESULT
If engine motors normally but does not start, go to
task 4-4.4.
4.
5.
6.
Check NO. 2 engine ground idle speed after
45 seconds.
Have pilot move both NO. 1 and NO. 2
engine condition levers to flight and stabilize
rotors at minimum beep.
Have pilot beep both NO. 1 and NO. 2
engines to 100 percent rotor rpm and match
torque.
If engine oil pressure indicator (8) does not indi-
cate oil pressure, go to task 8-3.3,
If engine oil pressure is below 20 psi, go to task 8-
3.3.
If gas producer tachometer (9) does not indicate
rpm, go to task 8-2.3.
If PTIT indicator (10) does not indicate tempera-
ture, go to task 8-5.3.
If PTIT indication is high or hot start occurs, go to
task 4-1.4.
If pilots rotor tachometer (12) does not indicate
rpm, go to task 8-15.3.
If gas producer tachometer (9) does not indicate
between 60 and 63 percent rpm, go to task 4-1.5.
If either NO. 1 or NO. 2 engine N2 overspeeds, go
to task 4-1.6.
If either NO. 1 or NO. 2 engine acceleration is
rough or surging, go to task 4-1.7.
If dual engine minimum beep is not between 92-
96 percent, go to task 4-1.8.
If either NO. 1 or NO. 2 engine power turbine (N2)
actuator does not increase or decrease, go to task
4-6.3.
If either NO. 1 or NO. 2 engine oil pressure indica-
tor (3 and 8) readings fluctuate more than 5 psi,
go to task 8-3.3.
3. Have pilot start NO. 2 engine and stabilize at
If NO. 2 engine N1 CONT caution light (7) does
ground idle.
not come on, go to task 4-5.3.
If engine does not motor, go to task 4-4.4.
If engine NO. 2 STARTER ON light (11) does not
come on, go to task 4-4.4.
GO TO NEXT PAGE
Change 1
4-3