DOC AIRBUS | AMM A320FENGINE STARTING - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. Component Location
Engine Starting System - (Starter Air Control Valve and Manual Override Drive) ** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL Engine Starting System - (Starter Air Control Valve and Manual Override Drive) ** ON A/C NOT FOR ALL - The starter is attached to the rear of the engine main gearbox at the 5 o'clock position.
PRE SB C-80-00-0006A (Without Chip Collector) - The starter magnetic drain plug chip collector is located on the starter.
END OF PRE SB C-80-00-0006A
POST SB C-80-00-0006A (With Chip Collector) - The starter magnetic chip collector is located on the starter.
END OF POST SB C-80-00-0006A - The starter air control valve is attached to the starter air ducts at the 4 o'clock position.
- The starter speed sensor is located on the starter.
| FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||||
| 100KM | STARTER-PNEUMATIC | 400 | 80-11-41 | ||
| 102KM | MAGNETIC CHIP COLLECTOR-STARTER | 400 | 80-11-42 | ||
| 4005KS | CTL VALVE-STARTER AIR | 400 | 80-11-51 | ||
| 4208KS | SENSOR-STARTER SPEED | 400 | 80-11-00 | ||
2. Component Description
A. Starter
(1) The starter converts air flow to power (torque) to drive the main gearbox, which in turn rotates the engine.
(2) The starter requires a corrected air flow rate of 59 pounds per minute.
(3) The starter speed sensor is a mechanically single and electrically dual channel sensor. The target teeth are located on the ring gear of the planetary gear system and reads the starter gearbox output speed into the clutch. This is the same speed as the starter output shaft during the start cycle. The indicated speed of the starter will go to zero when the engine speed is more than the starter clutch disengagement speed. The signal is processed by the EEC and used to find if the starter is rotating (during start) or not rotating (during normal engine operation).
(4) The starter has a single-piece output shaft and synchronous engagement clutch. The starter gears and bearing are splash-lubricated from a shared oil system (shared with the engine oil system). The starter oil capacity is 16 - 20 oz. (473 - 591 ml). Fill and drain ports are provided in the housing for servicing.
PRE SB C-80-00-0006A (Without Chip Collector)
PRE SB C-80-00-0006A (Without Chip Collector)
(5) The starter must be drained before removal and inspection of the magnetic drain plug chip collector.
END OF PRE SB C-80-00-0006A
POST SB C-80-00-0006A (With Chip Collector)
END OF PRE SB C-80-00-0006A
POST SB C-80-00-0006A (With Chip Collector)
(6) The starter chip collector is removed to inspect the starter chip collector magnetic probe.
END OF POST SB C-80-00-0006A
END OF POST SB C-80-00-0006A
B. Starter Air Control Valve
(1) The valve is actuated with a FADEC controlled dual coil solenoid integrated into the SAV design. The position is determined by the high rotor speed (N2). The valve also has a 3/8 inch square drive for manual override capability.
(2) The SAV is a pneumatically actuated butterfly valve. It connects to a 4 in. (101.60 mm) stainless steel duct with a 0.035 in. (0.89 mm) wall thickness. "V" band flanges (lower starter air duct) and a flex joint coupling (located in the upper starter air duct) are used with the SAV to enhance system maintenance.
C. Dual Cooling
(1) Conditions to launch the DUAL COOLING function:
(a) "ENG DUAL COOLING NOT AVAIL" ECAM is a memo displayed when DUAL COOLING overhead panel pushbutton is selected and dual cooling not available. There are specific conditions to launch appropriately the DUAL COOLING function once activated (Ref. FCOM DSC-70-80-40 and Ref. FCOM PRO-NOR-SOP-08). These conditions are as follow:
1 Engine oil temperature needs to be above either 15 deg.C (59.0 deg.F) or 30 deg.C (86.0 deg.F) (upon APU type) (Ref. FCOM Dual Cooling Envelope) on both engines, before engage DUAL COOLING overhead panel pushbutton.
2 Automatic engine start mode is selected, through ENG MODE selector set to IGN/START (ENG MAN START overhead panel pushbutton staying OFF).
3 COOLING time is displayed on both engines.
4 DUAL COOLING pushbutton is pushed by the flight crew before auto start sequence launched.
(b) In summary, DUAL COOLING can be available if:
1 Both engines require cooling (COOLING memo and time displayed)
NOTE: COOLING is not displayed when Motoring-to-Start is below 20 sec and DUAL COOLING pushbutton is not selected.
NOTE: Motoring-to-Start time is calculated by the EEC upon engine thermal status (key parameter is the time since engine shut down).
2 Dual cooling envelope FCOM conditions fulfilled.
3 FCOM procedure is followed.
4 An automatic engine start mode is commanded (function not available in case of Manual start).
D. ICARE (Integrated and Controlled APU to Rotate Engine)
(1) The ICARE function is to improve engine start availability while the SAV is failed.
(2) The ICARE function is automatically active during all engine manual start procedures.
(3) The ICARE function modulates the APU bleed air flow in order to perform engine Motoring to Start (MtS) which is required prior to the Main Engine Start (MES) sequence. Indeed, ICARE will process the cooling to get rid of the bowed rotor effect even if SAV is not operational.
(4) For aircraft starting operations under ref. MMEL 80-11-01 (Failed Starter Air Valve), ICARE allows aircraft dispatch without respecting the minimum engine shutdown time.
(5) The ICARE function involves the following aircraft systems and computers:
- Air systems (Bleed Monitoring Computer (BMC), Air Conditioning System Controller (ACSC))
- Powered air source and controls (APU, Electronic Control Box (ECB))
- Engine controls system (EEC)
- Aircraft and engine interface (Engine Interface Unit (EIU)).