1139. ASE PANEL YAW SWITCH DOES NOT STAY ON

1138. ASE PANEL ROLL SWITCH DOES NOT STAY ON

1140. ASE PANEL ATTD/HOVER HOLD SWITCH DOES NOT STAY ON

TM-1-1520-238-T-7 Army Model AH-64 Helicopter (NSN
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TM 1-1520-238-T-7 11–258 11–39. ASE PANEL YAW SWITCH – DOES NOT STAY ON 11–39 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 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. To prevent the possibility of shorting, use extreme care when checking voltage at mass termination connectors. Failure to do so could result in damage to equipment or possible injury to personnel. 1. Check for 28 VDC at P170–A9. Is voltage present? YES Replace pilot ASE panel (TM 1-1520-238-23). NO Go to step 2. 2. Check for open between P170–A9 and P683–121. Does open exist? YES Repair open wire. Go to paragraph 11–23. NO (ACA) Replace DASEC (TM 1-1520-238-23). (ACB) Go to step 3. 3. (ACB) Detach filter adapter A706. Check for open between A706–121 and P170–A9. Does open exist? YES Replace filter adapter (TM 1-1520-238-23). NO Replace DASEC (TM 1-1520-238-23). END OF TASK

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