Mooney M20TN, Service And Maintenance Manual

Page: 267 / 1169

MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Page
Date
13
2006
Rev Date
-- CAUTION --
Do not run pump dry for more than 15 seconds.
NOTE:
When the aircraft will not be flown for a period of
time, refer to Sections 10--10--01, 10--10--02 &
10--10--03.
28--22--00 -- GASCOLATOR SCREEN CLEANING
Gascolator screen removal and cleaning;
1. Remove belly skin just aft of nose wheel well.
2. Turn fuel selector valve – OFF.
3. Remove safety wire on bottom nut; remove nut.
4. Remove sump and screen by pulling down.
5. Clean screen.
6. Reverse removal process to reinstall. Take care
not to damage O--rings. Have new replacement O--
rings available, if needed.
7. Lubricate O--rings with clean engine oil before
installing.
8. Torque nut 10 to 15 in. lbs.
9. Safety wire nut, to prevent loosening, exactly as
original installation.
28--23--00 -- FUEL INJECTION SYSTEM
28--24--00 -- ENGINE PRIMING
There is no separate priming system on the M20TN air-
craft. Operating the Low boost pump switch in the cock-
pit turns auxiliary fuel pump -- ON. The time for running
pump, for starting purposes, is dependent upon outside
ambient temperature (See POH/AFM Section IV for
chart).
28--25--00 -- FUEL SELECTOR VALVE REMOVAL &
INSTALLATION
The fuel selector valve is located below floor board just
aft of console.
1. Drain both fuel tanks. Refer to Chapter 28--30--00
for procedures to de--fuel aircraft.
2. Disconnect inlet lines at valve body.
3. Disconnect outlet lines at valve body.
4. Disconnect both fuel return lines at valve body.
5. Remove handle above floorboard in fuel selector
pan.
6. Remove screws that mount valve to tubular struc-
ture.
7. Remove valve.
8. Reverse removal procedure to install valve.
9. Refuel aircraft.
10. Leak check fuel system.
28--30--00 -- FUEL DUMP
The fuel tanks can be emptied for maintenance pur-
poses by: (1) removing sump drains in lower panel of
each fuel tank and allowing fuel to drain into suitable
container or (2) disconnect fuel line at outlet of fuel
pump and use boost pump, with appropriate fittings
and hoses, to transfer fuel from both tanks into a suit-
able storage container.
Isolate aircraft to outdoor, secure area:
-- Keep aircraft away from ignition source.
-- Ground aircraft (and any external fuel pump system,
if used) properly.
-- Use suitable container(s) for fuel storage.
-- Have operating fire extinguisher and authorized per-
sonnel available.
-- Use trained personnel for all fueling and/or defueling
procedures.
28--31--00 -- FUEL SYSTEM DRAINS
Fuel drains are installed at aft, inboard corners of each
wing tank and on gascolator, the lowest point in the fuel
system. The engine manifold and engine--driven fuel
pump drains join at a juncture on right side of engine. A
single drain line dumps fuel overboard below cowling.
Tank drains are recessed and spring loaded closed. An
O--ring at lower flange seals drain valve seat. Check the
tank drain valves after each use to verify the O--ring is
properly sealed when the spring loaded valve is closed.
28--32--00 -- FUEL VENTS
Fuel tanks are vented from outboard upper edge. This
vent is routed outboard through wing structure and
vented overboard through a NACA vent on lower wing
surface. Expansion of fuel takes place inside tank as
temperature and environmental conditions change.
NOTE:
It is important that fuel tank vent tubes protrude
only enough to be flush with lower wing skins.
28--40--00 -- INDICATING
28--41--00 -- FUEL QUANTITY INDICATING
TRANSMITTERS
The Fuel Quantity displayed on the G1000, is the quan-
tity of fuel in the tanks in gallons. The indicator ranges
from E (Empty) to F (Full) with tick marks at 10, 20, 30,
and 40 gallons. Two triangle pointers labeled L (Left)
and R (Right) indicate the number of gallons in each
fuel tank. There are two color bands on the Fuel Quanti-
ty indicator.
Yellow -- Caution
Red -- Warning
The fuel quantity indicating system has two fuel quanti-
ty transmitters in each wing tank; one on inboard wing
tank rib and one on outboard wing tank rib. Each pair of
transmitters interface with the Garmin G1000 to indi-
28--22--00
AUGUST 2010