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SEE A START VALVE MAIN GEARBOX SEE SEE C B FWD A (QAD) ADAPTER QUICK ATTACH-DETACH STARTER
FLIGHT COMPARTMENT ENGINE AUTOSTART OFF ON 12 34 ELEC ENG CONTROL NORM NORM NORM NORM w w w w ALTN ALTN ALTN ALTNa a a a ENGINE IGNITION CONTROL MODULE EEC PANEL ASSEMBLY BC Engine Starting System - Component Location Figure 1
B60383 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 80-11-00 ALL ú ú N07 Page 2 ú Feb 10/93 BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. C. The gears and bearings of the starter are splash-lubricated by a self-contained oil system. Fill, overflow, and drain ports are supplied in the housing for servicing. The magnetic chip detector (MCD) assembly, installed on the drain port, includes an inner MCD probe and an outer MCD housing. The MCD probe can be removed to look for metallic chips without draining the oil. A check valve in the MCD housing prevents draining when the MCD probe is removed. D. An EICAS caution message STARTER CUTOUT # will show on the main EICAS display, after a 5 second delay, when the corresponding engine start valve is open or commanded open at more than 50 %N2 rpm.
NOTE: "#" denotes engines 1, 2, 3, or 4. ____ 3. Start Valve (Fig. 3) ___________ A. The start valve controls compressed air flow to the starter. The start valve is a spring loaded closed, diaphragm-actuated, solenoid operated, butterfly type pneumatic shutoff valve. The start valve has three primary components; the valve body, actuator, and the position indicating switch. B. The dual diaphragm, pneumatic actuator is torsion-spring loaded with a solenoid valve and an externally mounted relief valve. The actuator is connected to the butterfly shaft with a connecting link and arm. The solenoid valve is a three-way ball valve. The bleed-off pressure regulator is a spring loaded, poppet type, relief valve.
MCD DETECTOR (MCD) PROBE
OIL FILL PLUG Starter Figure 2
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 80-11-00 ALL ú ú N04 Page 3 ú Feb 10/93 BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. ////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL //////////////////////// HEAT SHIELD SOLENOID VALVE AMBIENT VENT PNEUMATIC ACTUATOR
BLEED OFF REGULATOR ELECTRICAL RECEPTACLE CLOSED SOLENOID OPEN RATING ORIFICE OPENCLOSING TORSION SPRING CHAMBER A CLOSING POSITION
DIAPHRAGM A SECTION AMBIENT SEE A
VENT START VALVE BLEED OFF REGULATOR
REGULATOR DIAPHRAGM B ORIFICE SQUARE DRIVE SOCKET
FILTER CHAMBER B BUTTERFLY AIR FLOW ORIFICE ELECTRICAL CONNECTOR OPEN POSITION
MANUAL OPERATINGINDICATOR SWITCHSTART VALVE DRIVE AND POSITION MANUAL OVERRIDE INDICATOR CLOSED POSITION A INDICATOR SWITCH SQUARE DRIVE ELECTRICAL CONNECTOR Start Valve Figure 3 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 80-11-00 ALL ú ú N01 Page 4 ú Oct 10/88 BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. C. The position indicating switch has two electrical switches in a housing installed on the valve body, opposite side of the valve actuator. A manual override and position indicator is installed on top of the position switch. D. The valve body contains the butterfly shaft, bearings, pneumatic filter, and a butterfly plate. The position of the start valve butterfly plate is controlled by the solenoid valve. Air immediately upstream of the butterfly plate is filtered and routed through an orifice to chamber A, the solenoid valve, then chamber B. When the solenoid is energized, the ball valve moves to the opposite seat. This stops air pressure to chamber B and bleeds air pressure in chamber B to ambient through the opening rate orifice. Air pressure acts on the large diameter diaphragm against the combined force of the torsion spring and the upstream pressure acting on the small diameter diaphragm. The force from the opening diaphragm is transmitted through a mechanical linkage to turn the butterfly plate to the fully open position. www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 起动 STARTING
