TM 1-1520-238-T-5
7–112
7–33.
RTR BRK CIRCUIT BREAKER – DOES NOT STAY CLOSED (cont)
7–33
8. Detach P173 and P914. Check for short
between:
P173–Z and ground,
P173–C and ground,
P173–a and ground,
P173–b and ground.
Does short exist?
YES
Repair shorted wire between:
P173–Z and P441–A4,
P173–C and P441–A7,
P173–a and J914–B7,
P173–b and J914–B8.
Go to paragraph 7–21.
NO
Go to step 10.
9. Detach P1072. Check for short between:
P442–A2 and ground,
P442–A4 and ground.
Does short exist?
YES
Repair shorted wire between:
P442–A2 and P1072–A,
P442–A4 and P1072–B.
Go to paragraph 7–21.
NO
Replace rotor brake pressure
switch (TM 1-1520-238-23).
10. Attach P173. Set meter to low scale (R x 10).
Check for short between P441–A7 and ground.
Does short exist?
YES
Replace pilot power quadrant
panel (TM 1-1520-238-23).
NO
Go to step 11.
11. Check for short between P441–A4 and ground
while setting pilot power quadrant RTR BK
switch to OFF and BRAKE.
Does short exist?
YES
Go to step 13.
NO
Go to step 12.
12. Detach P238. Check for short between:
P914–B7 and ground,
P914–B8 and ground.
Does short exist?
YES
Repair shorted wire between:
P914–B7 and J436–A16,
P436–A16 and P238–15,
P914–B8 and J436–A15,
P436–A15 and P238–1.
Go to paragraph 7–21.
NO
Replace utility manifold
(TM 1-1520-238-23).
13. Remove pilot power quadrant panel
(TM 1-1520-238-23). On pilot power quadrant
RTR BK switch (A24)S86, tag and remove
terminal lugs from S86–3, S86–5, S86–11.
Check for short between (A24):
S86–3 and ground,
S86–5 and ground,
S86–11 and ground.
Does short exist?
YES
Repair shorted wire between
(A24):
J1–Z and S86–5,
J1–a and S86–11.
Go to paragraph 7–21.
NO
Go to step 14.
14. Check for short between (A24)S86–3 and
ground.
Does short exist?
YES
Go to step 15.
NO
Replace pilot power quadrant
RTR BK switch (A24)S86
(TM 1-1520-238-23).
