TM 1-1520-238-23
6-124
6.25.
ENGINE NOSE GEARBOX METALLIC CHIP DETECTOR INSPECTION
6.25.1. Description
This task covers:
Inspection.
6.25.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Light duty laboratory apron (item 27, App H)
Chemical protective gloves (item 154, App H)
Adjustable air filtering respirator (item 262, App H)
Materials/Parts:
Brush (item 34, App F)
Dry cleaning solvent (item 74, App F)
Personnel Required:
67R
Attack Helicopter Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1520-238-T
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
6.25.3. Inspection
a. Check chip detector magnetic plug for metal chips, granular steel, metal flakes, or splinters.
(1) If no metal chips, flakes, or splinters are present, continue flight operations.
(2) REPLACE GEARBOX if granular steel is present (looks like sand).
(3) REPLACE GEARBOX if steel splinters or flakes greater than 1/16 (0.062) by 3/16 (0.187) INCH are
present. Go to step a(4) if splinters or flakes are smaller.
(4) REPLACE GEARBOX if more than 10 1/16 (0.062) by 1/16 (0.062) INCH steel flakes or particles are
present. Go to step b if flakes or particles are smaller or fewer.
b. Clean chip detector probe. Use brush (item 34, App F) and dry cleaning solvent (item 74, App F).
c. Reinstall chip detector and perform drive system dynamic maintenance operational check
(TM 1-1520-238-T).
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