Rockwell Commander 112 - Page 32

ROCKWELL
COMMANDER
112/B/TC/TCA
MAINTENANCE MANUAL
SECTION n
SERVICING
AND INSPECTION
c. Replace and check security of fill port cap.
d. Wash spilled fuel from wing surface with clean
water.
e. Repeat procedure for opposite tank.
DRAINS. On model 112/TC four fuel drains are pro-
vided at the lowest points of the fuel system to ex-
tract moisture and sediments entrapped in the system.
On model 112B/TCA five drains are installed (see
Figure 2-4). Draining the fuel tanks, tank sump and
gascolator is accomplished by use of drain valves
located adjacent to the tanks, sump or gascolator.
All fuel drains except the gascolator should be drained
prior to the first flight of each day. The gascolator
should be drained and checked every 25 hours of ope-
ration. Drain a small quantity of fuel into a trans-
parent container to permit inspection for presence of
moisture or sediment. Fuel should be drained until
all evidence of moisture or sediment disappears.
Drain check the fuel system as follows:
a. Drain a fuel sample from wing tank sumps on
inboard underside area of each tank.
b. On model 112/TC aircraft, place fuel selector
valve on interior center console on BOTH and pull to
drain selector valve through bottom of fuselage. An
outside assistant will be needed to obtain fuel sample.
NOI.
The fuel selector remote drain valve
will also permit draining of the individual
tank lines by switching to either RIGHT
or LEFT and pulling up on valve handle.
Return fuel selector valve to RIGHT or
LE FT position to prevent fuel from flow-
ing
from one tank to the other and over-
flowing out of tank vent line.
On model 112B/TCA aircraft drain a fuel sample from
each wing tank sump located just forward of each main
wheel well opening.
c . Drain fuel sample from gascolator every
25 hours of operation by pushing in on drain or by
pulling
drain handle as applicable.
d. Visually check that all drain valves close after
draining.
FUEL SYSTEM SCREENS. Filter screens incorporated
in the fuel system are: finger inlet screens in both
fuel tank outlet lines and a screen in the gascolator
connected to the electric fuel pump, mounted on the
firewall. The gascolator screen should be removed,
inspected and cleaned every 100 hours of operation or
sooner if improper fuel circulation is suspected. The
finger inlet screens should be removed, inspected
and cleaned annually unless improper fuel circulation
requires immediate service to the system. See
Section V for removal and cleaning instructions.
DE FUE LING. Gasoline fumes are present during de-
fueling operation; therefore, extreme caution must be
exercised to prevent fire hazards.
Change 3
WARNING I
Smoking on or around the airplane is
not permitted during defueling proce-
dure. Fire protection equipment must
be immediately available.
a. Ground airplane and ground any defueling equip-
ment to airplane.
b. Place airplane on level surface.
c. Remove engine cowling.
d.
Disconnect fuel inlet supply line to engine-
driven fuel pump.
e. Connect defueling hose to fuel inlet supply line
and place end of hose in fuel container. Size of con-
tainer is determined by amount of fuel to be drained.
f. Remove fuel tanks filler caps.
g. Place fuel selector valve to BOTH.
h. Place master battery switch to ON, or attach an
auxiliary power unit to airplane.
i. Place auxiliary fuel pump switch to FUEL PUMP.
j. Place auxiliary fuel pump switch to OFF when
fuel
stops pumping. Drain residual fuel from all drains.
k. Remove drain hose, reconnect fuel inlet supply
line to engine-driven fuel pump and torque !fBI! nuts to
100 inch-pounds.
VACUUM FILTER. See Section vm for complete
description and servicing.
LANDING GEAR, WHEELS AND BRAKES
STRUT SERVICING. Place airplane on jacks with
gear clear of ground and inflate main gear struts to
150 psi for the Model 112 and 395 (:r 10) psi for the •
Model 112B/TC/TCA to obtain correct strut extension.
Nose gear strut is inflated to 90 psi for the Model
112 and 120 psi for the Model 112B/TC/TCA. The
main gear strut nitrogen filler valve is installed on
the side of the strut, while the nose gear strut valve
is located on top of the strut. Use nitrogen gas to
inflate the strut.
NOI.
Moisture free compressed air may be
used for temporary servicing. Reservice
with nitrogen gas as soon as possible.
Check gear assembly for general cleanliness, security
of mounting, and hydraulic leaks at prescribed inspec-
tion intervals. Refer to Section VI for detailed des-
cription of strut servicing. Keep chromed surface of
strut wiped free of dirt and dust, using a clean lint-
free cloth dampened in MIL-H- 5606 hydraulic fluid.
TIRES. Tires should be inspected for proper inflation,
breaks, cuts, foreign objects in tread, flat spots, and
exposed cord. Replace tire if there is any question of
its reliability. Proper inflation is necessary for max-
imum tire life. Maintain nose wheel tire pressure at
2-11
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