3–1 SYSTEMS – POWER

TM 1–1520–238–T–1 3–4 Change 6 3–1 SYSTEMS – POWER–UP (cont) 3–1 · Do not operate equipment if ECS indicator on the pilot caution/warning panel is lit. Failure to comply could result in damage to equipment. · Do not position the AGPU under a main rotor blade. Main rotor blade damage may occur from intense radiant heat from the AGPU exhaust. · If auxiliary fuel tank kits are installed, ensure pylon actuator connectors are installed on dummy connectors. 1. Operating instructions, initial switch settings, electrical, hydraulic and pneumatic interfaces are provided for the application of external power using AGPU. a. Make sure that the APU circuit breaker in the aft avionics bay (fig. 2–50) and the APU HOLD circuit breaker on the pilot center circuit breaker panel (fig. 2–6) are open before proceeding. WARNING AGPU operation exceeds acceptable safe noise levels. Personnel working near or operating will wear approved ear protection to protect their hearing. Failure to comply could result in permanent hearing loss. b. Perform AGPU prestart procedures prior to placing the AGPU on–line (refer to TM 55-1730-229-12 for operator and aviation unit maintenance (AVUM) maintenance instructions on the AGPU. c. Attach AGPU power cable to the EXTERNAL POWER CONNECTOR – 115 VAC/DC 400 Hz receptacle on the aircraft and apply ac power via the AC control panel on the AGPU (refer to TM 55-1730-229-12 for operator and AVUM maintenance instructions on the AGPU).