Normal Use
(I)
Warm up taken off and fly for the first fifteen minutes on reserve tanks. This is to provide space in
the reserve tanks for the vapour return from the carburetors. Switch both engines to the left
dropable tank until almost dry then shift to right dropable tank until almost dry. Determine hourly
fuel consumption from the charts in Appendix II. Fuel gauges are not installed in the dropable
tanks. Do not drop external tanks unless for increase range or for combat. Use up the fuel in the
outer wing tanks (if inst) then use main tanks, and switch back to RESERVE for the remainder of
the flight.
WARNING:
Always check the fuel level in the tank before trying to operate the engine from that
tank. To check the level in the outer tank, press the low level test switch on the side of
the warning light box. It is not possible to check the fuel level in the dropable tanks.
(2)
On modified airplanes the booster pumps should be operated during take-off) and landing to
prevent engine failure which may result from engine-driven fuel pump failure. The booster pumps
should also be operated during flight whenever necessary to maintain the required 16 to 18 lb/sq.
in. fuel pressure. On modified airplanes the booster pump master switches should be on at all
times. The speed control switch should be in the EMERGENCY position during take-off and
landing to prevent engine failure which may result from engine-driven fuel pump failure. The
booster pumps should also be operated on EMERGENCY whenever necessary during flight to
maintain the desired fuel pressure of 16 to 18 lb/sq. in. The speed control switches have no effect
on the dropable tank booster pumps. On modified airplanes the booster pump switches merely
supply power to the booster pumps. The proper pump is turned on by contacts on the tank selector
valve.
NOTE: Never exceed 250 mph indicated with 300 gallon dropable tanks installed.
(3)
To release drop tanks:
(a) Raise flaps and landing year.
(b) Turn tank selector valves to MAIN, RESERVE or OUTER WING.
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