TM 1-1520-238-T-7
11–245
11–29. ASE AC CIRCUIT BREAKER – DOES NOT STAY CLOSED
11–29
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
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.
NOTE
Unless otherwise indicated, components
and wires specified are common to all
DASE interconnection diagrams (pitch,
roll, yaw and collective/BUCS).
1. Open ASE AC circuit breaker. Check for short
between P1–54 and ground.
Does short exist?
YES
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (ac essential bus 1 –
pilot station).
NO
Go to step 2.
2. Check for short between:
(ACA) Wire end (A323)TB2–1–A and ground.
(ACB) P692–A and ground.
Does short exist?
YES
Repair shorted wire between
(A402):
J27–A11 and J1–54.
(ACA) P499–B7 and P431–A11,
(A323):
TB2–1–A and J5–B7.
(ACB) P692–A and P431–A11.
Go to paragraph 11–23.
NO
(ACA) Go to step 3.
(ACB) Replace isolation
transformer/filter assembly box
(TM 1-1520-238-23).
3. (ACA) Check for 13.5 ohms between wire end
(A323):
TB2–1–C and GS1–A.
Is resistance present?
YES
Replace 26 VAC excitation
transformer (A323)T2.
(TM 1-1520-238-23).
NO
Replace 26 VAC excitation
transformer (A323)T1
(TM 1-1520-238-23).
END OF TASK
