MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR M-5-220C
Rev. B 35/38
OFF. The fuel then runs through the firewall to the fuel gascolator. Fuel runs from the
gascolator to the electric fuel boost pump, to the engine driven fuel pump, and then to the car-
buretor. Leave selector valve on LEFT or RIGHT position when airplane is parked to prevent
fuel transfer from one side to the other.
If installed, two (2) auxiliary wing tip fuel tanks with eleven and one half (11.5) gallon ca-
pacity, are mounted in the second from the outboard wing bay. They are fuel transfer tanks
and simply supply fuel to the main tank through a small vibrator pump.
The fuel line should be checked for cracks and chafing every 100 hours or annually and
the gascolator should be cleaned at the same time by separating the bowl from the covering by
removing the three (3) attaching screws. A new rubber “O” ring (Parker No. 2-042) should be
installed every time the gascolator is disassembled. Always safety wire the screws in place up-
on reassembly.
The auxiliary tank transfer pump strainers should be cleaned at the same interval. This is
done by removing the pump bottom with a 5/8" wrench. The pump is on the rear spar, inboard
of the auxiliary tank, and the bottom is exposed.
The electrical system is a 14 volt, 50 amp, direct current, single wire circuit using the air-
plane structure as a ground return to the battery. All wiring in the airplane is fabricated into
harnesses which are groups of related wires tied together. Most of the harnesses originate at
circuit breakers on the main bus (center of instrument panel) and terminate at the load (light,
pump motor, etc.) Wiring diagrams are shown at the end of this manual.
CAUTION: Addition(s) of electrical equipment must not cause the total load to exceed 50 am-
peres. A 50 amp circuit breaker is installed in aircraft.
:
A lead plate type storage battery rated at 12 volts is installed in the battery frame assembly
under the right front seat. The battery supplies current for the airplane electrical system when
the master switch is in the “ON” position only. A heavy-duty battery solenoid switch is installed
next to the battery and is controlled from the Instrument panel by the battery switch.
To gain access to the battery, the right seat must be tipped back. Move the seat stop to the
down position. Push the seat all the way forward completely out of the track. Tilt seat back (rear
of seat need not be removed to reach battery). When replacing seat, slide seat all the way back
and move the seat stop to the up position.
The battery may be the vented type, with a top manifold vent. A vinyl tube attached to the
case vents the battery through the right step or out the engine air egress. Battery caps should
be kept tight to prevent electrolyte spillage. If spillage does occur, the affected area should be
cleaned with a liberal application of an acid neutralizing solution such as baking soda and water.
The vent tube must be properly routed through the right step or out the air egress as battery acid
will destroy the fabric. Some batteries are sealed recombinant designs which do not require the
external vent tube.
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