TM 1-1520-238-T-6
9–437
9–187. TADS AC CIRCUIT BREAKER (CB3) – DOES NOT STAY CLOSED OR 115 VAC IS NOT
9–187
PRESENT AT (A97): J1-H, J1-F, J1-E
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68F
Aircraft Electrician
References:
TM 1-1520-238-23
TM 1-1270-476-T
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. On pilot ELEC PWR panel, set BATT/EXT PWR
switch to EXT PWR.
Does TADS AC circuit breaker (CB3) stay
closed?
YES
Go to step 4.
NO
Go to step 2.
2. Open CB3 and set BATT/EXT PWR switch to
OFF. Check for short between (A97):
J1-H and ground,
J1-F and ground,
J1-E and ground.
Does short exist?
YES
Go to step 3.
NO
Refer to TM 1-1270-476-T to
troubleshoot TADS.
3. Detach wire at CB4-A2, CB4-B2, CB4-C2.
Check for short between (A97):
J1-H and ground,
J1-F and ground,
J1-E and ground.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 9–172.
NO
Replace TADS AC circuit
breaker (CB3)
(TM 1-1520-238-23).
4. Set BATT/EXT PWR switch to OFF. Check for
short between:
CB3-A1 and CB4-A1,
CB3-B1 and CB4-B1,
CB3-C1 and CB4-C1,
CB3-A2 and (A97)J1-H,
CB3-B2 and (A97)J1-F,
CB3-C2 and (A97)J1-E.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–172.
NO
Replace TADS AC circuit
breaker (CB3)
(TM 1-1520-238-23).
END OF TASK
