PART I-DESCRIPTIVE

     (b)  Three switches control the booster pumps. They arc the
          FUEL MASTER ON/OFF switch (31), the two-position
          TAKE-OFF-NORMAL auto override switch (36) and
          the three-position AUTO-RETRIM switch (at 61).
          Circuit breakers and test switches are in the starboard
          side of the equipment bay. Below generator cut-in speed
          the wing and rear tanks booster pumps do not switch on.

     (c)  At all times when the engine is running, the fuel master
          switch should be ON and, unless manual fuel balancing
          is necessary, the balance switch should be at AUTO.
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A.L.3    (d)  When the belly tank is carried and the override switch is
Para 4(d)      set to TAKE-0FF, the internal booster pumps operate in
Page 11       the normal manner but the belly tank booster pump is
                inoperative.  When the switch is set to NORMAL, if the
                belly tank contains fuel and the fuel is transferring cor-
                rectly, only the belly tank booster pump remains in
                operation. The other booster pumps are inoperative until
                either a pressure switch (transfer rate below minimum)
                or a float switch (tank empty) operates to switch off the
                belly tank pump and to switch on the internal tanks
                pumps. Automatic balancing then commences.
                NOTE-When reheat is in use below 15,000 ft., all
                         pumps are in operation irrespective of the switch
                         setting. Above 15,000 ft. with the switch at
                         NORMAL, belly tank fuel is used first, and then
                         auto balancing commences.
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     (e) (i) When automatic fuel balancing is in operation. the
             fuel in the front and centre tank group is kept in
             balance with that of the rear and wing tank group,
             in order to keep the C.G. within reasonable limits.
             To achieve this balancing, a relay, working with the
             fuel contents amplifiers, varies the speed of
             operation, and thus the output, of the booster pumps.

        (ii) Two magnetic indicators (at 61) are alongside the
             AUTO-RETRIM switch, and provide nose- or tail-
             heavy indications. The appropriate indicator shows
             white when such a state occurs and remains so until
             correct balance is again achieved.

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