TM 1-1520-238-23
6-268
6.60.
MAIN TRANSMISSION FILTER INSPECTION
6.60.1. Description
This task covers:
Inspection.
6.60.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1500-204-23
TM 1-1520-238-T
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access doors T250L, T250R, T290L,
T290R, and L325 opened; panels L200 and
R200 removed
6.60.3. Inspection
NOTE
This inspection covers main transmission filter elements, nose gearbox filter elements, shaft driven
compressor filter elements, and main transmission accessory pump filter.
a. Check filter or filter bowl for metal chips, flakes, splinters, or other contamination.
(1) Identify contaminants. Use permanent magnet to separate steel particles.
(2) Perform steps b. thru d. if five or more steel splinters or flakes greater than 1/16 (0.062) INCH by 3/16
(0.187) INCH are present. Go to step a.(3) if smaller.
(3) Perform steps b. thru d. if 10 or more steel flakes or particles greater than 1/16 (0.062) INCH by 1/16
(0.062) INCH are present. Go to step a.(4) if fewer.
(4) If smaller or fewer metal chips, flakes, or splinters than given in steps a.(2) or a.(3):
(a) Drain and flush main transmission (para 1.32).
(b) Replace main transmission filter elements (para 6.61) or (para 6.62), shaft driven compressor filter
element (para 7.124), and main transmission accessory pump filter (para 6.70).
(c) Perform drive system dynamic maintenance operational check (TM 1-1520-238-T).
(d) Check main transmission filter elements, shaft driven compressor filter element, and main transmis-
sion accessory pump filter.
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