Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
July 27, 2021
Submitted
September 15, 2021
Operation
Air carrier
Aircraft
N491WN
Make and model
Boeing 7377H4
Aircraft serial
33867
Aircraft time
53,758 hours, 31,898 cycles
Part
Stiffener
Condition
Cracked
Location
Bs 663 Bulkhead
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

B.S. 663 LOWER COMPOSITE BULKHEAD VERTICAL SUPPORT STIFFENER IS CRACKED AT L.B.L. 26; W.L. 150; ON AFT SIDE OF BULKHEAD. ; / [01] UPDATED MEASUREMENT TABLE; [02] REMOVED CRACKED VERTICAL SUPPORT STIFFENER BS 663; LBL 26; WL 150 AFT SIDE OF BULKHEAD PER SRM 51-40-02-0G-0; [03] LOCATED AND DRILLED VERTICAL SUPPORT STIFFENER AT B.S663 LBL 26; WL 150 AFT SIDE OF BULKHEAD PER SRM 51-40-05-0G-0;DWG 111A1000. O.K TO INSTALL.; [04] VERIFIED LOCATION; DRILL UP PER SRM 51-40-05-0G-0;DWG 111A1000. OK TO INSTALL STIFFENER; [05] INSTALLED VERTICAL SUPPORT STIFFENER BS 663; LBL 26; WL 150 AFT SIDE OF BULKHEAD PER SRM 51-40-02-0G-0;DWG 111A1000.; [06] VERIFIED SUPPORT STIFFENER INSTALLATION PER SRM 51-40-02 AND DWG 111A1000; [07] COMPLETE

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