737 Flight Crew Operations Manual
The ECU automatically controls APU speed through the electronic fuel control. If speed or EGT exceed acceptable levels with the APU providing electrical load only, some electrical load is shed. When electrical load and air extraction raise the EGT above acceptable levels during engine starting, electrical load shedding occurs prior to reducing bleed air. When electrical load and air extraction raise the EGT above acceptable levels other than during engine starting, the inlet guide vanes move toward a closed position, reducing bleed air extraction while maintaining electrical load.
APU Automatic Load Shedding
YA613 - YC413 In flight, if the APU is the only source of electrical power, all galley busses are automatically shed. If electrical load still exceeds design limits, both main busses automatically shed until the load is within design limits. On the ground, the APU attempts to carry a full electrical load. If an overload condition is sensed, the APU sheds galley busses first, and then both main busses until the load is within limits. Manual restoration of galley power can be attempted by moving the GALLEY Power Switch to OFF, then back ON.
YD651 - YK104 In flight, if the APU is the only source of electrical power, all galley busses and main buses are automatically shed. If electrical load still exceeds design limits, both IFE busses are also automatically shed. On the ground, the APU attempts to carry a full electrical load. If an overload condition is sensed, the APU sheds galley busses and main busses until the load is within limits. Manual restoration of galley and main bus power can be attempted by moving the CAB/UTIL Power Switch to OFF, then back ON.
Copyright . The Boeing Company. See title page for details.
7.30.4 June 1, 2005
Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.10.1
Overheat/Fire Protection Panel Switches . . . . . . . . . . . . . . . . . . . 8.10.1 Overheat/Fire Protection Panel Lights . . . . . . . . . . . . . . . . . . . . . 8.10.3 Cargo Fire Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.10.4 Master Fire Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.10.6 APU Ground Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.10.7 Lavatory Fire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.10.8
System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.1 Engine Fire Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.1 Engine Overheat and Fire Detection. . . . . . . . . . . . . . . . . . . . 8.20.1 Engine Fire Extinguishing . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.2 Engine Fire Extinguisher Schematic . . . . . . . . . . . . . . . . . . . 8.20.3 APU Fire Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.4 APU Fire Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.4 APU Fire Extinguishing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.4 Main Wheel Well Fire Protection . . . . . . . . . . . . . . . . . . . . . . . . 8.20.5 Main Wheel Well Fire Detection . . . . . . . . . . . . . . . . . . . . . . 8.20.5 Cargo Compartment Fire Protection . . . . . . . . . . . . . . . . . . . . . . 8.20.5 Cargo Compartment Smoke Detection . . . . . . . . . . . . . . . . . . 8.20.5 Cargo Compartment Fire Warning . . . . . . . . . . . . . . . . . . . . . 8.20.5 Cargo Compartment Fire Extinguishing . . . . . . . . . . . . . . . . . 8.20.6 Cargo Fire Extinguisher Schematic . . . . . . . . . . . . . . . . . . . . 8.20.6 Lavatory Fire Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.7 Lavatory Smoke Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.7 Lavatory Fire Extinguisher System . . . . . . . . . . . . . . . . . . . . 8.20.7 Fire and Overheat System Tests . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.7 FAULT/INOP Test Detection . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.8 OVERHEAT/FIRE Test Detection . . . . . . . . . . . . . . . . . . . . . 8.20.8
Copyright . The Boeing Company. See title page for details.
Fire Protection -Table of Contents
Extinguisher Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.8 Cargo Fire System Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.8 Cargo Fire TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.9 Cargo Fire Extinguisher Test. . . . . . . . . . . . . . . . . . . . . . . . . . 8.20.9 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737NG机组操作手册Flight Crew Operations Manual FCOM 2(127)
