Rockwell Commander 112 - Cold Weather Maintenance Hints; Cold Weather Operation; Leveling

ROCKWELL
COMMANDER
112/B/TC/TCA
MAINTENANCE MANUAL
SECTION IT
SERVICING
AND INSPECTION
XIS 2A
Figure 2-2. Mooring
floor and struts have fully extended. Provide adequate
clearance from floor surface if landing gear cycle tests
are to be made.
Check
that parking brake is released
prior to lowering the aircraft after
maintenance.
The nose gear may be raised without the use of jacks,
by lowering aft fuselage and securing with weighted tail
stand.
LEVELING
Leveling of the aircraft is required for weighing and
calibration of the fuel quantity indicating system. To
level the airc raft, place airc raft in an enclo sed hangar.
If aircraft is to be weighed, retract flaps, install con-
trol wheel lock, remove all loose equipment from the
aircraft and pOSition adjustable seats in the forward
position. Place scales under jack stands at wing and
nose jacking points. If scales are equipped with cas-
ter wheels, block wheels to prevent movement. Raise
all three jacks evenly until aircraft is high enough to
permit fore and aft leveling by adjustment of the nose
jack. Place a level on the exterior surface of the
fuselage floor pan just aft of the nose wheel well.
Minor lateral leveling adjustments can then be made
by
adjusting an individual wing jack. Accomplish
longitudinal leveling by placing a level in a fore and
aft direction on the exterior floor pan surface and
adjusting the nose jack as necessary.
COLD WEATHER OPERATION
Aircraft operation in cold weather creates a need for
additional maintenance practices and operating pro-
cedures that are not required in moderate tempera-
tures. Whenever possible, shelter aircraft in a
heated hangar to prevent frost, ice, and snow accumu-
lation which requires added maintenance time to
remove. These weather elements, if allowed to ac-
cumulate only a fraction of an inch in thickness on the
critical airfoils and control surfaces, seriously de-
grades aircraft lift and flight control effectiveness.
The possibility of aircraft system failures is increased
when the aircraft is parked where wind driven snow or
freezing rain can be forced into the engine air inlet,
fuel and static vents, heater air inlets, pitot tubes
and wheel wells. H aircraft is to be moored outside
in extreme cold, the battery should be fully charged
so it will not freeze. Make certain all vents, air in-
lets, static ports, etc., are covered. Make certain
cowl flaps are closed. The engine should be preheated
if aircraft is parked in the open when temperatures
are extremely low. Locating the aircraft inSide a
heated hangar is the most effective method of pre-
heating aircraft. Auxiliary ground heating units may
be used to preheat the engine. This will make start-
ing easier and assure proper engine lubrication at the
initial engine start. Use of an external power unit is
recommended to conserve battery energy if your air-
craft is equipped with the optional ground service
receptacle. General Aviation Divisions f Service De-
partment is available to advise operators having any
particular cold weather operation problems.
COLD WEATHER MAINTENANCE HINTS
Information contained below is intended only for the
purpose of supplementing existing information in this
manual, when operating aircraft in cold weather.
Keeping aircraft in top maintenance condition during.
2-3
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**unofficial copy**