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AP101B-7200-15
Fuel System
a. In the OFF position, all fuel is isolated from that wing’s tanks.
b. When selected to INNER ON both engines on that wing are fed
from the inboard No. 1 tank.
c. When selected to OUTER ON both engines on that wing are fed
from the outboard No. 2 tank.
14. Downstream of each tank cock is a master cock for each engine
on that wing. The inboard engines master cock is integral with the tank
cock whilst the outboard engines tank cock is independent and is just
outboard of the tank cock. Cables and chains operate the four master
cocks from levers (marked ON-MASTER FUEL COCKS-OFF) either side
of the throttle levers on the pilot’s centre pedestal.
15. A crossfeed cock (also referred to as a Balance Cock) is in the fuel
line that connects each wing downstream. The crossfeed cock is on the
front face of the front spar in the fuselage, it is accessed by lifting a flap
under the spare seat by the Wireless Operator’s station. The crossfeed
cock is operated manually when required, the handle being vertical when
closed and horizontal when open.
16. In each engine sub-frame, aft of the fireproof bulkhead, is a fuel
filter. An Engine Driven Pump (EDP) is driven from the left hand wheel
case. Its output is a nominal 13 PSI but this is varied by an Amal valve
downstream of the EDP. The Amal valve compensates automatically for
reduced air density at altitude and maintains smooth and constant fuel
flow and steady fuel pressure throughout all operating conditions.
17.
Fuel Pressure Indications.
There are four red lights on the Flight
Engineer’s fuel panel marked FUEL PRESSURE INDICATORS. The
lights illuminate when the pressure downstream of the AMAL valve falls
to 5PSI.
UNCONTROLLED DOCUMENT - NOT FOR USE IN FLIGHT OR TO BE PRINTED
UNCONTROLLED DOCUMENT - NOT FOR USE IN FLIGHT OR TO BE PRINTED
