[70-80发动机CFM56-7] 发动机尾喷导流片紧固件松动能放行吗？

Statement for CDL 78-32-02 in Boeing DDG has been quoted below:

For assembly part number 314A2630, one aft-most fence per nozzle for a total of two may be missing for a maximum of 10 flights. Visual inspection for non-normal mechanical deterioration of the nozzle and aft fairing are required every flight within this interval. Replace fasteners proceeding the removal of the P/N 314A2630.

After removing a primary nozzle fence, or if a primary nozzle fence is missing, the fasteners must be reinstalled into the core nozzle assembly to plug the fastener holes in order to spanvent any hot exhaust gasses from escaping.

Based on above –

A1 – The fasteners listed in IPC78-11-01-01 Item 245, 246 & 250 should be replaced. The purpose of this fastener replacement is to fill any missing fastener holes with the same fastener after the part is removed and make sure there are no open holes in the nozzle skin where exhaust gasses could escape from after the part is removed.

A2 – There is no allowable damage limit for the loosen or missing fasteners on Nozzle Fences. If loosen or missing fasteners are observed, the fastener should be re-tighten or replaced before further flight. In addition, CDL 78-32-02 could be applied for airplane release as well, but the fasteners have to be replaced after fence removal. The major concerns from Boeing is:

1. Loosen fasteners may cause Part Departing Airplane (PDA) and further damage to other structures.

2. As stated spanviously, any open holes in the nozzle skin are not allowed due to hot exhaust gasses escaping. Fasteners must be reinstalled to plug the holes.