TM 55-1520-240-23-1
1-86
COLD ENVIRONMENT MAINTENANCE
1-86
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanic’s Tool Kit, NSN 5180-00-323-4692
Zone Heater With Duct
Materials:
Cloth (E120)
Hydraulic Fluid (E197)
Release Agent (E308)
Deicing-Defrosting Fluid (E74)
Dry Cleaning Solvent (E162)
Cleaning and Polishing Compound
(E118 or E282)
Personnel Required:
Medium Helicopter Repairer
Reference:
TM 1-1500-204-23
TM 55-410
Task 1-64
Task 1-78
Task 2-2
Task 2-40
Task 4-64
Task 4-76
Task 5-93
Task 9-25
Equipment Conditions:
As Required
General Safety Instructions:
As Required
NOTE
Refer to TM 1-1500-204-23 for cold
weather maintenance information.
1.
Follow cold weather maintenance procedures for
engines as described:
a.
Remove snow and ice from air inlet housings
before starting engines.
b.
Remove bypass panels from engine air inlet
screens for operation at temperatures below
40ºF (4ºC) (Task 4-64).
c.
Open screen access panel (Task 2-2).
d.
Check that compressor rotor turns freely.
Do not use starter to free frozen
compressor rotor. Engine damage
will result.
NOTE
Condensed moisture will freeze
engine parts when engine cools to
32ºF (0ºC) after shutdown.
e.
Free frozen compressor rotors. Use heater
and duct at air inlet housing.
f.
Close engine air inlet screen access panel
(Task 2-2).
2.
Follow cold weather maintenance practices for
battery as described:
a.
If helicopter will be parked overnight at -40ºF
(-4ºC) or below, remove battery (Task 9-25).
Store battery in warm place.
b.
Keep electrical loads to minimum before
starting APU.
3.
Wipe exposed shafts of landing gear shock struts
daily during cold weather operation (Task 1-78).
This prevents accumulation of ice and dirt which
damages seals and packings. Use cloth (E120)
damp with hydraulic fluid (E197).
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