TM 55-1520-240-23-4
5-44.1
INSPECT AND REPAIR PITCH-VARYING SHAFT BORE
5-44.1
INITIAL SETUP
Applicable Configurations:
All
Tools:
Technical Inspection Tool Kit, NSN 5180-00-323-5114
Machinist Scriber, 0.020 Inch Diameter Point
Fluorescent Penetrant Method
Materials:
Gloves (E186)
Crocus Cloth (E122)
Abrasive Pads (E2)
Personnel Required:
Aircraft Powertrain Repairer
Inspector
References:
TM 1-1500-335-23
TM 1-1520-253-23
TM 55-1520-240-23P
Equipment Condition:
Off Helicopter Task
Do not touch parts with bare hands.
Wear gloves (E186). Fingerprints can
cause corrosion.
1.
Inspect bore liner (1) of pitch-varying shaft (2)
as follows:
a.
Check for rust or corrosion. There shall be
no rust or corrosion.
b.
Check for stains. Stains shall be removable
using solvent or light polishing.
c.
Check for pits with a scriber. Pits shall not be
felt as the scriber slides over them. Reject a
shaft with pits deeper than 0.012 inch.
2.
Repair pits up to 0.012 inch deep as follows:
a.
Blend out pit into surrounding area with
crocus cloth (E122). Remove minimum
material from liner (1). Do not leave any
sharp edges.
b.
Polish reworked area. Use abrasive pads
(E2).
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