TM 9-2350-247-20-1
TACHOMETER MALFUNCTIONS
0088 00
INITIAL SETUP:
Maintenance Level
Unit
Tools and Special Tools
General Mechanic’s Tool Kit (WP 0541 00, Item 57)
Materials/Parts
Grease WP 0542 00, Item 14
Personnel Required
Unit Mechanic
Helper (H)
References
See your -10
See your PMCS
Equipment Condition
Engine stopped (see your -10)
Carrier blocked (see your -10)
Power plant rear access door/panel removed
(see your -10)
Instrument panel partially removed (WP 0256 00)
NOTE
M548A1 and M548A3 troubleshooting procedures are the same. M548A1 procedure is shown.
T
1. Start engine (see your -10).
2. Does tachometer fail to show any reading?
YES
NO
GO TO BY (PAGE 0088 00-2)
Y
1. Stop engine (see your -10).
2. Remove tachometer cable (1) from tachometer (2).
3. Start engine (see your -10).
4. Observe tachometer cable drive tip (3).
5. Does tachometer cable drive tip fail to rotate?
YES
NO
YN
1. Stop engine (see your -10).
2. Replace tachometer (WP 0519 00).
3. Verify no faults found.
0088 00-1
