CLASSIFICATION OF FUSELAGE DAMAGE AND TYPES OF REPAIR

TM 1-1520-238-23 2-40 Change 1 2.12. CLASSIFICATION OF FUSELAGE DAMAGE AND TYPES OF REPAIR 2.12.5. Impact or Fatigue Damage Category Limits Action a. Skin or Sheet Metal Holes, Cracks, or Tears B Holes: less than 3.00 INCH diameter. (Clean up can be no closer than 2.00 INCHES to supporting structure and no more than 5 PERCENT of skin area.) Clean up and patch repair (TM 1-1500-204-23). Cracks or tears: no longer than 25 PERCENT of shortest skin dimension. Clean up and patch repair (TM 1-1500-204-23). b. Skin or Sheet Metal Nicks or Scratches A Less than 10 PERCENT of material thickness. Clean up (para 1.47). (Area cannot exceed 4.00 SQUARE-INCHES.) B Deeper than 10 PERCENT but less than 25 PERCENT of material thickness. Clean up (para 1.47). (Area can not exceed 5 PERCENT of skin area and can be no closer than 2.00 INCHES to supporting structure.) C Exceeds B. Replace. c. Skin Dents A Smooth dents less than 0.25 INCH deep. Repair (TM 1-1500-204-23). B Dents with nicks or gouges or deeper than 0.25 INCH. Patch repair (TM 1-1500-204-23). (Treat dents as holes.) C Dents greater than 3.00 INCHES in diameter (clean up can be no closer than 2.00 INCHES to support structure and will not exceed 5 PERCENT of skin area.) Repair (TM 1-1500-204-23). d. Aluminum Honeycomb Panel Cracks, Tears, or Punctures B Less than 6.00 INCH diameter in either direction after repair and clean up. Repair (TM 1-1500-204-23). C Exceeds B or repair will hinder normal operation or function. Replace. GO TO NEXT PAGE