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Fuel is stored in the wings and the trimmable horizontal stabiliser. The wings have inner and outer tanks. In addition there is a centre tank in the centre fuselage, and optionally 1 or 2 ACTs. The FCMS controls the fuel system.
Each engine is fed by 1 main fuel pump, and there is 1 crossfeed valve for each engine.
Fuel is always fed to the engines from inner tanks.
There are 2 pumps per engine: 1 main and 1 standby (which automatically operates if the main fails). Each pair is isolated in a collector box in the inner tank.
In an electrical emergency, only main pump 1 remains powered. If it fails or is off, STBY pump 4 replaces it automatically. After land recovery, fuel feed is by gravity only.
Tanks are emptied as follows.
- Fuel is transferred from centre tank to inner tanks via 2 transfer pumps.
- Inner tanks are emptied.
- Fuel from trim tank is transferred to inner tanks.
- Fuel from outer tanks is transferred to inner tanks by gravity.
- Inner tanks cycle between full - 2,000 kg and full.
|Outer Tank||Inner Tank||Centre Tank||Trim Tank||Total||ACT (optional)|
|litres||3,650 × 2||42,775 × 2||42,420||6,230||141,500||7,200|
|kg (SG 0.785)||2,865 × 2||33,578 × 2||33,300||4,890||111,078||5,652|
Table: Fuel quantity (exact quantities depend on aircraft mod)
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