Avoid snow and slush blown by preceding
aircraft by increasing distance between aircraft when
Inspect oil and fuel drains and crankcase
breathers for ice or frost. Remove any existing frost or
Reduce taxi speeds to ensure safe stop-
Exercise care when pulling out or turning
from parking line to ensure that other aircraft will not be
damaged or covered by snow and ice from propeller
Avoid taxiing into deep snow or snow drifts,
as steering could become difficult, brakes could freeze,
and damage to propellers could result.
Unless aircraft is equipped with an auxiliary
power unit, use only essential electrical equipment to
preserve battery life while taxiing at low engine speeds.
b. Taxiing. The following are general procedures for
Only personnel authorized to taxi as speci-
fied in AR 95-1 may taxi Army aircraft.
Do not taxi aircraft on any taxiway which
runs within 100 feet of active runways unless necessi-
tated by terrain or directed to do so by proper authority.
Upon approved signal from flight compart-
ment, approach and remove wheel chocks. Exercise
caution and consideration for operating propellers, tur-
bine inlet, and exhaust areas.
Use only sufficient engine power to gain roll-
ing momentum when taxiing aircraft from a row of parked
aircraft. When it is necessary to turn aircraft, gain
required momentum in straight movement to permit mak-
ing turn with reduced power.
Under normal operations, wing guides will
not be mandatory. However, when an aircraft is maneu-
vered in proximity of other aircraft, buildings, or obstruc-
tions, or in gusty or high wind conditions, there shall be
wing guides to ensure adequate guidance.
c. Postflight and Parking.
The following procedures
are listed to prevent abortive flights following the last
flight of the day, and to protect parked aircraft:
Drain oil tank sump and main oil drain
before condensation freezes.
Inspect battery for charge at least once a
week. If layovers are to be over 4 hours and temperature
is below -20°F (-29ºC), remove battery and store in a
Drain oil system when there is no provision
available for preheating oil and a long layover period is
(5) When temperature rises above freezing
during a long layover, drain fuel and oil tank sumps of
water before temperature drops.
3-12. Test Flights and Maintenance Operational
Maintenance test flights are categorized as
general test flights and limited test flights. Specific and
mandatory requirements for accomplishment of aircraft
test flights and maintenance operational checks are
found in Section III, TM 55-1500-328-23.
a. Test Flight Safety
Maintenance test flights will be
accomplished with assistance as necessary from the
most proficient flight crew available; i.e., copilot, techni-
cal inspectors, and observers. Aviators who are not grad-
uates of The Aircraft Maintenance Test Flight course may
be designated as Maintenance Test Pilots upon success-
ful completion of an evaluation administered in accor-
dance with FM 1-544. Minimum crew possible will be
aboard aircraft during test flight.
b. Maintenance Operational Checks.
operational checks (MCCs) are accomplished on the
ground through engine runup, aircraft taxiing or use of
auxiliary power or testing equipment, in such a manner
as to simulate conditions under which the system is to
operate. The purpose of an MOC is to assure that aircraft
systems or components which have been disturbed dur-
ing an inspection or maintenance action have been
repaired, reassembled or adjusted satisfactorily.
c. Carbon Monoxide Detection.
Determine the car-
bon monoxide concentration in aircraft after every major
overhaul. Follow the procedures and limits in the instruc-
tions packed with the carbon monoxide detector.