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CHAPTER 80
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STARTING
TABLE OF CONTENTS
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SUBJECT_______ CH/SE/SU _ PAGE EFFECTIVITY________ C ____ ___________ Handle Position after Engine Start Refer to the MMEL TASK: 80-11-04 401 ALL Manually Operate the Starter Valve 404 ALL Refer to the MMEL TASK: 80-11-01 404 ALL
STARTER 80-11-10 REMOVAL/INSTALLATION 401 ALL Removal of the Pneumatic Starter 401 ALL Installation of the Pneumatic 406 ALL Starter STARTER 80-11-10 INSPECTION/CHECK 601 ALL Check Chip Detector 601 ALL Starter Inspection for a Probably 613 ALL FOD (Foreign Object Damage)
VALVE - STARTER SHUTOFF 80-11-20 REMOVAL/INSTALLATION 401 ALL Removal of the Starter Shutoff 401 ALL Valve Installation of the Starter 405 ALL Shutoff Valve DUCT - LOWER STARTER 80-13-42 REMOVAL/INSTALLATION 401 ALL Removal of the Lower Starter Duct 401 ALL Installation of the Lower Starter 405 ALL Duct DUCT - LOWER STARTER 80-13-42 INSPECTION/CHECK 601 ALL Visual Inspection of the Lower 601 ALL Starter Duct DUCT - FLEXIBLE STARTER 80-13-43 REMOVAL/INSTALLATION 401 ALL Removal of the Upper Starter Duct 401 ALL Installation of the Upper Starter 405 ALL Duct DUCT - FLEXIBLE STARTER 80-13-43 INSPECTION/CHECK 601 ALL Visual Inspection of the Upper 601 ALL Starter duct
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STARTING - GENERAL - DESCRIPTION AND OPERATION
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1. General
_______ (Ref. Fig. 001) The starting system of the engine utilizes pressurized air to drive a turbine at high speed. This turbine applies a torque to the engine high pressure rotor system through a reduction gear in the (starter) turbine and through the engine accessory drive system. The air which is necessary to drive the starter comes from :
- the APU,
- or the second engine,
- or a ground power unit.
The starter air supply is controlled by a starter shutoff valve (SOV)
pneumatically operated and electrically controlled. The SOV has a manual
override capability which permits the valve to be opened or closed in case
of failure of the electrical control.
The starter shutoff valve closes when the N2 speed reaches 50 percent.
The starter centrifugal clutch disengages when N2 speed is higher than 50
percent.
Engine starting is controlled from the ENG start panel 115VU located on
center pedestal and ENG/MAN START switch on the overhead panel.
The starting sequence may be interrupted at any time by placing the MASTER
control lever in OFF position which overrides the FADEC. When the MASTER
control lever is in OFF position the HP fuel shutoff valve is closed and the
engine is stopped.
Two procedures are applicable for engine starting :
A. Normal Starting Procedure (automatic) (Ref. 74-31-00) The starting sequence is fully controlled by the FADEC and is selected when the ENG/MODE/CRANK/NORM/IGN/START selector switch is in IGN/START position and the MASTER control lever in ON position. Start can be aborted on ground only by the FADEC in case of failure.
B. Alternative Starting Procedure
(Ref. 74-31-00)
This sequence controlled by the pilot is as follows :
- the ENG/MODE/CRANK/NORM/IGN/START selector switch in IGN/START position and MAN START pushbutton switch command the start valve
- the MASTER control lever commands HP fuel shutoff valve.
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Pneumatic System Schematic
Figure 001
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2. Component Location
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