TM 1-1520-238-23
6-214
6.45.
MAIN TRANSMISSION CHIP DETECTOR INSPECTION
6.45.1. Description
This task covers:
Inspection.
6.45.2. 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
6.45.3. Inspection
a. Check chip detector magnetic plug for metal chips, flakes, or splinters.
(1) Identify steel particles. Use a permanent magnet to isolate steel particles.
b. Perform steps f. thru h. if more than five steel splinters or flakes greater than 1/16 (0.062) INCH by 3/16
(0.187) INCH are present.
(1) Go to step c if flakes are smaller.
c. Perform steps f. thru h. if more than 10 steel flakes or particles greater than 1/16 (0.062) INCH by 1/16
(0.062) INCH are present.
(1) Go to steps d. and e. if fewer than 10 flakes are present.
d. Clean chip detector probe.
e. Reinstall chip detector and perform drive system dynamic maintenance operational check
(TM 1-1520-238-T).
(1) If metal chips, flakes, or splinters are still present on chip detector probe:
(a) Clean chip detector probe.
(b) Drain and flush transmission oil system (para 1.32).
(c) Replace transmission filter elements (para 6.61) or (para 6.62), transmission accessory pump filter
element (para 6.70), and shaft driven compressor filter element (para 7.124).
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