TM 1-1520-238-23
4-12
Change 3
4.2.
ENGINE INSPECTION
4.2.1. Description
This task covers:
Inspection.
4.2.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Industrial faceshield (item 129, App H)
Chemical protective gloves (item 154, App H)
Adjustable air filtering respirator (item 262, App H)
30 - 150 inch-pound 1/4-inch drive click type torque
wrench (item 435, App H)
0 - 75 inch-pound 1/4-inch drive dial indicator torque
wrench (item 446, App H)
Materials/Parts:
Methyl ethyl ketone (item 124, App F)
Sealing compound (item 167, App F)
Personnel Required:
67R
Attack Helicopter Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1500-204-23
TM 55-1500-322-24
TM 55-1500-323-24
TM 55-2840-248-23
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access panels removed, as necessary
4.2.3. Inspection
a. Check engine tubes, hoses, and fittings for cracks, nicks, scratches, chafing, and dents.
(1) No cracks allowed.
(2) If depth of defect can be measured on fuel carrying tubes, replace tube. No damage allowed.
(3) On non-fuel-carrying tubes nicks, scratches, and chafing not to exceed 0.005 INCH are repairable if repair
has not been previously done in same area.
(4) On straight or curved sections of tubing with a bend radius larger than twice the tube OD, replace tubing
with dents larger than 20 percent of tube OD.
(5) On curved tubing with a bend radius less than twice tube OD, replace tubing with dents larger than 10
percent of tube OD.
b. Check hoses for kinks and buckling. None allowed.
c. Check brackets and support clips for cracks (TM 1-1500-204-23).
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