TM 1-1520-238-T-4
Change 5
6–57
6–13.
DRIVE SYSTEM – DYNAMIC MAINTENANCE OPERATIONAL CHECK (cont)
6–13
Task
Result
If FD/LS displays –32 C for XMSN 2 oil temperature,
go to paragraph 6–21.1.
If FD/LS does not display ambient (or higher if
recently operated) for NGB 2 oil temperature, go to
paragraph 6–22.
If FD/LS displays –32 C for NGB 2 oil temperature,
go to paragraph 6–22.1.
If FD/LS displays –32 C for NGB 1, XMN 1, XMN 2,
and NGB 2, go to paragraph 6–22.3.
2. Start engines and run at 100% Nr until all components temperatures stabilize (TM 1-1520-238-CL). While
ground running, check the instruments and caution/warning panels for abnormal drive system conditions.
CAUTION
Shut down helicopter if the HOD displays a 28 lbs. or less oil pressure
reading on any component, or an oil temperature reading climb above
140 C on any component. Failure to shut down helicopter can result in
damage to the drive system.
3. Complete the maintenance operational check as follows:
Task
Result
a. On CPG HOD (fig. 6–20 ), check FD/LS
display for NGB 1 oil reading.
If HOD NGB 1 oil pressure displays 0 LB oil pressure,
shutdown helicopter and go to paragraph 6–15.
If HOD NGB 1 oil pressure displays 50 LB oil
pressure, shutdown helicopter and go to
paragraph 6–15.1.
If HOD NGB 1 oil pressure displays >99 LB oil
pressure, shutdown helicopter and go to
paragraph 6–15.2.
If HOD NGB 1 oil pressure displays 54 LB oil
pressure or less, shutdown helicopter and go to
paragraph 6–15.3.
