9287. RDR ALT CIRCUIT BREAKER (CB31) DOES NOT STAY CLOSED OR 28 VDC IS NOT PRESENT AT (A76): J1-f AND J1-g

9286. STBY ATTD CIRCUIT BREAKER (CB19) DOES NOT STAY CLOSED OR 28 VDC IS NOT PRESENT AT (A76)J1-e

9288. TRIM CIRCUIT BREAKER (CB87) DOES NOT STAY CLOSED OR 28 VDC IS NOT PRESENT AT (A76): J1-Y AND J1-Z

TM-1-1520-238-T-6 Army Model AH-64 Helicopter (NSN
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TM 1-1520-238-T-6 9–580 9–287. RDR ALT CIRCUIT BREAKER (CB31) – DOES NOT STAY CLOSED 9–287 OR 28 VDC IS NOT PRESENT AT (A76): J1-f AND J1-g Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68X Armament/Electrical Systems Repairer One person to assist References: TM 1-1520-238-23 TM 11-1520-238-23-2 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 RDR ALT circuit breaker (CB31) stay closed? YES Go to step 4. NO Go to step 2. 2. On pilot center circuit breaker panel, open RDR ALT circuit breaker (CB31). Set BATT/EXT PWR switch to OFF. Check for short between (A76): J1-f and ground, J1-g and ground. Does short exist? YES Go to step 3. NO Refer to TM 11-1520-238-23-2 to troubleshoot radar altimeter set. 3. Detach wire at CB31-2. Check for short between (A76): J1-f and ground, J1-g and ground. Does short exist? YES Repair shorted wire. Go to paragraph 9–263. NO Replace RDR ALT circuit breaker (CB31) (TM 1-1520-238-23). 4. Set BATT/EXT PWR switch to OFF. Check for open between: CB31-2 and (A76)J1-f, CB31-2 and (A76)J1-g. Does open exist? YES Repair open wire. Go to paragraph 9–263. NO Replace RDR ALT circuit breaker (CB31) (TM 1-1520-238-23). END OF TASK

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