TM 55-2840-241-23 Table 7-1. Combustion Liner Inspection (Continued) Item Inspection and Method Serviceable Limits Repairable Limits Corrective action 4 Burning in area of relief slots. (See figure 7-8.) (Visual) Rear edge burned less than 1/16 in. or both corners burned less than 1/14 in. along relief slot. Not repairable. Replace liner. 5 Crack on outside of liner. (See figure 7-8.) If a crack on outside of liner is suspected, refer to TM 1- 1520-254-23, Technical Manual Aviation Unit Maintenance (AVUM) and Aviation Intermediate Maintenance (AVIM) Manual Nondestructive Inspection Procedure for OH-58 Helicopter Series. (Visual)   None permitted. Any number as long as crack length does not exceed limits shown in figure 7-8. Not repairable if crack cannot be completely welded and/or weld obstructs cooling air passage. Weld repair. (Refer to paragraph 7-32b.) 6 Crack in tab end inside liner. (See figure 7-8.) If a crack in tab end inside liner is suspected, refer to TM 1- 1520-254-23, Technical Manual Aviation Unit Maintenance (AVUM) and Aviation Intermediate Maintenance (AVIM) Manual Nondestructive Inspection Procedure for OH-58 Helicopter Series. (Visual) No cracks greater than 1/4 in. long and no more than two cracks per tab. Not repairable. Replace liner. 7 Cracks at two adjacent relief slots progressing toward same hole. (See figure 7-8.) If a crack is suspected, refer to TM 1- 1520-254-23, Technical Manual Aviation Unit Maintenance (AVUM) and Aviation Intermediate Maintenance (AVIM) Manual Nondestructive Inspection Procedure for OH-58 Helicopter Series. Not permitted. Not repairable. Replace liner. Change  23  7-11 (Visual)