TM 1-1520-238-T-5
7–123
7–41.
TWHL LOCK CIRCUIT BREAKER (CB59) – DOES NOT STAY CLOSED (cont)
7–41
6. Identify and detach wires from (A331):
S1–2 and S1–3. Check for short between:
J527–A14 and ground,
J527–A15 and ground,
P527–A14 and ground.
Does short exist?
YES
Repair shorted wire between:
J527–A14 and (A331)S1–2,
J527–A15 and (A331)S1–3,
P527–A14 and P441–A6.
Go to paragraph 7–21.
NO
Replace TAIL WHEEL switch
(TM 1-1520-238-23).
7. Check for short between P442–A1 and ground.
Does short exist?
YES
Go to step 8.
NO
Go to step 9.
8. Detach P1011. Check for short between
P442–A1 and ground.
Does short exist?
YES
Repair shorted wire between
P442–A1 and P1011–A.
Go to paragraph 7–21.
NO
Replace utility shutoff valve
solenoid (TM 1-1520-238-23).
9. Check for short between P402–B9 and ground.
Does short exist?
YES
Go to step 10.
NO
Repair shorted wire between
P431–A6 and J402–B9.
Go to paragraph 7–21.
10. Detach P760. Check for short between P402–B9
and ground.
Does short exist?
YES
Go to step 11.
NO
Replace tail landing gear
proximity switch
(TM 1-1520-238-23).
11. Remove tail wheel lock relay. Check for short
between P402–B9 and ground.
Does short exist?
YES
Repair shorted wire between:
P402–B9 and XK34–A2,
P402–B9 and XK34–X1,
P402–B9 and P760–1.
Go to paragraph 7–21.
NO
Replace relay K34
(TM 1-1520-238-23).
END OF TASK
