ENGINE INSPECTION

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). GO TO NEXT PAGE