DOC AIRBUS | AMM A320FSTARTING - GENERAL - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
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 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 :
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.
Pneumatic System SchematicThe air which is necessary to drive the starter comes from :
- the APU,
- or the second engine,
- or a ground power unit.
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. AMM D/O 74-31-00-00)
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.
(Ref. AMM D/O 74-31-00-00)
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. AMM D/O 74-31-00-00)
This sequence controlled by the pilot is as follows :
(Ref. AMM D/O 74-31-00-00)
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.
2. Component Location
| ------------------------------------------------------------------------------- |
| FIN I FUNCTIONAL DESIGNATION I PANELIZONEIACCESS I ATA |
| I I I I DOOR I REF. |
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| VALVE-STARTER SHUTOFF 436 438AR 80-11-20 |
| 438CR |
| 446 448AR |
| 448CR |
| STARTER 438 438AR 80-11-10 |