MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Page
Date
5
MAR 2017
Rev Date
12-00-00 - SERVICING
12-00-01 - SERVICING INTERVALS
The spec
ified intervals (refer to Chapter 5) are consid-
ered adequate to meet average requirements under
normal operating conditions. It is advisable, however,
to shorten service and maintenance intervals when op-
erating under abnormal environmental conditions,
such as extreme temperature ranges, dusty atmo-
spheric conditions, high humidity and moisture, unim-
proved airport facilities, or unusual operating require-
ments.
12-10-00 - REPLENISHING
12-10-01 - FUEL TANKS
Keep fuel tanks at least half filled to minimize con-
densation and moisture accumulation in tanks (Fuel
capacity is given in Chapter 6).
-WARNING-
Bond aircraft and fuel service vehicle during
refueling. Permit no smoking or open flame
within 50 feet of aircraft or vehicle.
-WARNING-
Each fuel tank is vented to t he atmosphere at
its outboard aft corner; vent openings are on
the lower wing surface. Check vents for ob-
structions before each flight.
Exercise following precautions when handling fuel
around aircraft.
Isolate aircraft to outdoor, secure area:
- Keep aircraft away from ignition source.
- Ground aircraft (and any external fuel pump sys-
tem, if used) properly.
- Use suitable container(s) for fuel storage.
- Have operating fire extinguisher and authorized
personnel available.
- Use trained personnel for all fueling and/or de-
fueling procedures.
12-10-02 - FUEL DRAINS
A fuel- drain valve is located in the aft inboard corner of
each tank to provide for drainage of moisture and sedi-
ment. Use the small plastic cup furnished with the fly-
away kit to drain fuel sumps. Drain wing tank sumps
and gascolator before first flight of the day and after
each fuel service to inspect for water and/or contamina-
tion. Continue draining until free of water or contamina-
tion.
-WARNING-
After servicing aircraft with fuel, wait at least
five minutes for moisture and sediment to
settle before draining and checking both the
fuel tank sumps and the fuel selector valve
drain.
1. Fuel Gascolator Drain. The fuel gascolator is at the
lowest point in the fuel system and has a drain valve op-
erated by a control on the floor in the cabin. To drain the
fuel gascolator:
A. Switch fuel selector valve handle to L and pull
fuel drain valve control ring for 10 seconds.
B. Switch fuel selector valve handle to R and pull
fuel drain valve control ring for 10 seconds.
C. After draining, be sure fuel drain valve control is
returned to the closed position and the valve is not leak-
ing outside aircraft.
-WARNING-
During cold weather operation, frequently
check fuel gascolator drain for ice formation
by repeating procedures 1., A, B and C above.
-NOTE-
If conditions conducive to fuel system icing ex-
ist, Alcohol may be added to fuel tanks. It is ex-
tremely important to thoroughly BLEND the iso-
propyl alcohol in with the fuel supply in
quantities not to exceed 3% of the total, by
volume.
2. Defueling. Fuel tanks may be drained by one of
several methods: pumping fuel out with electric boost
pump, siphoning fuel through the filler ports, or remov-
ing tank quick drain valves.
-WARNING-
Allow no smoking or open flame within 50
feet of the defueling area. Ground aircraft and
fuel container during all defueling operations.
A. To defuel aircraft using electric boost pump (Use
auxiliary power supply):
(1) Disconnect fuel line from electric boost pump
outlet at the fitting forward of the firewall.
(2) Connect a flexible line to output fitting that will
reach fuel receptacle.
(3) Turn fuel selector valve to tank to be drained,
and remove filler cap from fuel filler port.
(4) Turn boost pump ON until tank is empty. Re-
peat steps (3) and (4) to drain other tank.
(5) To completely drain fuel system also drain
wing tank sumps and fuel gascolator valve sump until
fuel stops running.
12-00-00
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