TM 55-1520-240-T
4-1.1
ENGINE PERFORMANCE CHECK OPERATIONAL CHECK (Continued)
4-1.1
TASK
RESULT
If either NO. 1 or NO. 2 engine oil temperature
indicator (5 and 10) readings is high, go to Task
4-1.9.
If either pilot’s or copilot’s rotor tachometer (6
and 12) does not indicate between 98 and 102
percent rpm, go to Task 8-15.3.
If either NO. 1 or No. 2 engine emergency power
indicator (13 and 14) is on, go to Task 8-5.3.
7. Have pilot set ENG anti-ice switch (15) to
If NO. 1 engine anti-icing valve does not operate,
ON.
go to Task 4-2.4.
If NO. 2 engine anti-icing valve does not operate,
go to Task 4-2.4.
8. Have pilot set ENG anti-ice switch (15) to
OFF.
9. Have pilot establish stable hover. Check rotor
Rotor rpm shall not change more than +0 to -2
rpm indicator (6 and 12) and torque indicator
percent. Torque indication shall not split more
(16 and 17) indications.
than 6 percent. If either indication does, go to
Task 4-1.10.
FOLLOW-ON MAINTENANCE:
TM 55-1520-240-23:
Battery Disconnected
Electrical Power Off
Hydraulic Power Off
4-4
Change 2
