TM 55-2840-241-23 Table 7-1. Combustion Liner Inspection (Continued) Item Inspection and Method Serviceable Limits Repairable Limits Corrective action 10 Cracks in igniter ferrule attaching weld. (See figure 7-8.) If a crack in igniter ferrule attaching weld  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. Crack does not exceed 1/4 in. long. Weld repair. (Refer to paragraph 7-32c.) 11 Roughened igniter ferrule ID. (See figure 7-8.) (Visual) None permitted. ID does not exceed 0.560 in. after polishing. Polish ID. (Refer to paragraph 7-32d.) 12 Worn or distorted (out-of- round) igniter ferrule. (See figure 7-8.) (Visual) Wall thickness is not less than 0.020 in. and/or ID does not exceed 0.560 in. Not repairable. Replace liner. 13 Crack in fuel nozzle ferrule attaching weld. (See figure 7-8.) If a crack in fuel nozzle ferrule attaching weld  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. Crack does not exceed 1/4 in. long. Weld repair. (Refer to paragraph 7-32c.) 14 Roughened fuel nozzle ferrule ID. (See figure 7-8.) (Visual) None permitted. ID does not exceed 0.670 in. after polishing. Polish ID. (Refer to paragraph 7-32d.) 15 Worn or distored (out-of- round) fuel nozzle ferrule. (See figure 7-8.) (Visual) ID does not exceed 0.670 in. Not repairable. Replace liner. Change  23  7-12.1