Service difficulty report · Structure · Boeing 7377BD

Difficulty date
March 16, 2023
Submitted
April 4, 2023
Operation
Air carrier
Aircraft
N556WN
Make and model
Boeing 7377BD
Aircraft serial
33936
Aircraft time
37,398 hours, 21,958 cycles
Part
Structure
Condition
Out Of Round
Location
Zn 100 Fus Lower
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

4EA HOLES IN BS 1016 LOWER BULKHEAD COMMON TO Y CHORD RBL 2-5 ARE OUT OF ROUND<[01] OVERSIZED 4(EA) HOLES IN BS 1016 LOWER BULKHEAD COMMON TO Y CHORD RBL 2-5 ; FROM .193' TO .193 IAW SRM 51-40-05-0G-0;[02] CUT AND REMOVED THE DAMAGED PART OF THE INTERNAL PRESSURE BULKHEAD WEB COMMON TO THE 4EA OUT OF ROUND HOLES AND ONLY 3 OUT OF 4 HOLES REMAIN OUT OF ROUND IAW SRM 51-10-02-0G-0 . WEB REPAIR WILL BE ACCOMPLISHED ON FAULT [TTG8Q00JS23H];[03] CUT AND REMOVED THE DAMAGED PART OF THE INTERNAL PRESSURE BULKHEAD WEB COMMON TO THE 4EA OUT OF ROUND HOLES AND ONLY 3 OUT OF 4 OF THE OUT OF ROUND HOLES REMAIN ON THE Y CHORD IAW SRM 51-10-02-0G-0 . WEB REPAIR WILL BE ACCOMPLISHED ON FAULT [TTG8Q00JS23H];[04] VERIFIED STEP 1 AND CORRECTIVE ACTION 3.;[05] REFER TO FAULT TTG8Q00JS23H;[06] REAMED THE 3EA OUT OF ROUND HOLES COMMON TO THE Y CHORD TO .290 IAW SRM 51-40-05;[07] REPAIRING THE 3EA REMAINING HOLES WILL BE ACCOMPLISHED ON FAULT TTG8Q00JS23H;[08] REFER TO FAULT TTG8Q00JS23H PER EA 23-153-00918

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