Fuel Systems




 
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Fuel transfer

Transferring fuel is achieved through the cross feed process.

Transferring of fuel can be accomplished both in the air and on the ground and will transfer fuel from one tank to the other at the rate of approximately 400-500 lbs/hr.

Engines not running (on the ground)

Fuel transfer on the ground without the engines running is accomplished by selecting the boost pump switch to MAIN, for the tank in which fuel is to be removed from, with the fuel selector positioned to cross feed in the required direction, i.e. left tank to right engine, with the left boost pump switch to MAIN.

The left boost pump switch to MAIN and the cross feed selector Left tank to right engine. This selection of cross feed will cause the L. AUX BOOST ON light to illuminate as both the main and auxillary boost pumps are used on the same side during cross feed operations.

Engines running (in the air or on the ground)

Fuel transfer with the engines running is accomplished by simply selecting the fuel selector to cross feed from the required tank to the opposite engine.

The main boost pumps are normally selected ‘on’ so excess fuel not being required by the engines will be transferred to the opposite tank.

Engines running (in the air or on the ground)

Once again because the fuel selector switch has been selected to cross feed, the AUX BOOST ON light for the tank being transferred FROM will illuminate.

Remember, if cross feeding from left tank to right engine, the left main and auxillary boost pumps will be operating and the right main and auxillary boost pumps will be deactivated.

Fuel cross feed

The cross feed system consists of a single cross feed line interconnecting the engine nacelle fuel lines, two cross feed valves and the three position fuel selector switch.

When the fuel selector switch is in the vertical 'OFF' position the two cross feed valves are closed and the engines draw fuel from there respective tanks.

When the fuel selector switch is turned to the LH ENG position both cross feed valves are opened (which will momentarily illuminate the IN TRANSIT light) with the right hand main and auxillary boost pumps being activated and both left hand boost pumps deactivated.

With both pumps from the one tank operating, sufficient fuel is available to both engines at all power settings.

Whilst cross feeding from the right tank to the left engine, any fuel that is not required by either engine will be fed back to the left hand tank as previously described in the section on fuel transfer.

With the fuel selector switch in the opposite cross feed position the procedure previously described is obviously reversed.

Fuel level low indicators

The left and right FUEL LEVEL LOW indicators on the annunciator panel will provide an indication to the crew when the fuel level in each tank reaches between 150-250 lbs.

These lights are activated by a float switch in each tank and operate INDEPENDANTLY of the fuel quantity indicators.

Limitations

Minimum approved fuel for takeoff is 208 lbs of fuel per side.

Due to possible fuel starvation maximum sideslip duration is 1 minute when the left or right X-FER PUMP FAIL light is illuminated. Note: The aircraft is considered to be side slipping when the balance ball is more than half of ball off centre.

Fuel drains

There are three fuel drains per side, six in total, two drains are located in each hopper tank and one drain in each cross feed line.

Each drain should be checked prior to the first flight of each day, and after each refuelling.

 
Fuel transfer & Fuel


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