PART 1-DESCRIPTIVE

    FUEL AND OIL SYSTEMS
        
    1.   Fuel tanks and gauges
    
    (a)  Fuselage tank

         The fuselage tank is divided into two equal compart-
 	 ments.  The front compartment normally feeds the port
 	 engine and the rear compartment the starboard engine but
 	 the compartments are interconnected by the operation
 	 of a balance cock (29).  Each compartment contains nega-
 	 tive G traps, ensuring sufficient fuel for 15 seconds' inverted
 	 flight.  There are vent holes near the top of the dividing
 	 diaphragm and fuel may, in certain  circumstances pass
 	 from one compartment to another through these holes.
                                             
   (b)  Drop tanks

        A ventral tank and two under-wing drop tanks may be
        carried.
        
   (c)  Tank capacities

        Tank capacities (in gallons) are as follows:-

            Fuselage tank	..	..	..	325
            Ventral tank	..	..	..	175
            Wing drop tanks (2x100)	..	..	200
                    Total fuel	..	..	..	700
                     
   (d)  Fuel gauges
        
        Two electrical fuel contents gauges (52, 54), one for each
        compartment of the fuselage tank. are below the front
        cockpit instrument panel and similar gauges (111) are
        below the rear cockpit instrument panel.   There are no
        gauges for the drop tanks.

   2.   Fuel transfer   
    
        Fuel from the drop tanks is transferred to the fuselage
        tank by air pressure from the engines.  Air pressure to
        either the ventral tank or the wing tanks is selected by a
        T-handle (35) at the upper left-hand side of the front cock-
        pit instrument panel.  (This handle is also used to jettison
        the ventral tank.)  A float valve in each fuselage tank
        compartment prevents overtfilling of the fuselage tank by
        fuel from the drop tanks: the fuel level in the fuselage tank
        falls to approximately 125 gallons a side before the float
        valves open.

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