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A.L.1. PART III - HANDLING
Para. 57 (e)
contd.
Page 52 With both booster-pumps off, the recuperators will also
discharge, therefore no negative G manoeuvres must be
carried out. It is important to land while both sides still
contain fuel, because the flow proportioner will maintain
out-of-balance levels and the engine will not run with one
side empty unless the booster-pump in the side containing
fuel is serviceable. The serviceable pump may be switched
on for landing if a sufficient head of fuel remains on that
side, but it should be remembered that with the pump on,
fuel will only be used from that side.
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(f) Transfer failure
(i) If one or both transfer indicators show "cross-line,"
transfer pressure failure has occurred and steep dives
should be avoided due to the possibility of collapsing
the tanks. Should an indicator show "cross-line"
before fuel transfer is complete, any fuel remaining
in the rear and wing tanks will be unusable and the
associated contents gauge will only indicate the
usable fuel in the front tanks (770 lb. max. per tank).
In these circumstances if the gauge registers more
than the total contents of a front tank a faulty gauge
should be suspected and only the front tank fuel
should be relied on as being available to the engine.
If air transfer fails on one side, the booster-pump on
the side with the transfer failure should be switched
OFF until the contents gauge of the other side
indicates an equal amount, then reset the pump ON.
(ii) An indicator may show cross-line when the wing
tanks are empty or nearly empty due to an air
pressure reducing valve freezing. Since this may
only occur when the rear and wing tanks are empty
it is not serious from a fuel point of view, but rapid
descents must be avoided otherwise the tanks may
collapse.
(g) Unusable fuel
(i) If a "tank empty" float in a rear tank becomes
saturated its switch will operate before the tank has
emptied. It is important to check that the change-
over to wing takes place at approx. 1,300 lb.
If the changeover occurs at a higher reading set the
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