CLASSIFICATION OF FUSELAGE DAMAGE AND TYPES OF REPAIR

TM 1-1520-238-23 Change 2 2-37 2.12. CLASSIFICATION OF FUSELAGE DAMAGE AND TYPES OF REPAIR 2.12.1. Description This task covers: Damage Limits Categories. Types of Damage (Examples): Limits and Action. Corrosion. Impact or Fatigue Damage. Abrasion Damage. 2.12.2. Damage Limits Categories The following damage limits categories are assigned to help you establish repairable limits for particular areas and parts. Applicable categories are listed only for a damaged area or part. Category Description A Negligible damage to be repaired at first opportunity B Minor damage requiring immediate action with temporary repair C Major damage requiring immediate repair/replacement 2.12.3. Types of Damage (Examples): Limits and Action Category Limits Action a. Type: Skin Corrosion A Less than 20 PERCENT of skin thickness and no more than 25 PERCENT of panel area. Remove corrosion (para 1.49). B More than 20 PERCENT of skin thickness and less than 50 PERCENT of panel with no effect on adjacent structure. Patch repair (TM 1-1500-204-23) not to exceed 25 PERCENT of total panel. C More than 50 PERCENT of skin thickness. Replace affected area with patch repair (TM 1-1500-204-23). b. Type: Skin or Sheet Metal Holes, Cracks, or Tears A No negligible limits allowed. ------- B No minor limits allowed. ------- C No cracks or tears more than 25 PERCENT of shortest skin panel dimension. Clean up and patch repair (TM 1-1500-204-23). No holes greater than 3.00 INCHES diameter (clean up can be no closer than 2.00 INCHES to support structure). Clean up and patch repair (TM 1-1500-204-23). GO TO NEXT PAGE