Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
February 22, 2023
Submitted
March 10, 2023
Operation
Air carrier
Aircraft
N289CT
Make and model
Boeing 7377H4
Aircraft serial
36633
Aircraft time
50,940 hours, 30,659 cycles
Part
Stiffener
Condition
Cracked
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

FLIGHT DECK FLOOR REPAIR - CRACK NOTED IN THIRD LAYER OF FASTENER HOLE AT BS 254 LBL 4 WL 208. MARKED LOCATION.<[01] REMOVED FITTING SUPPORT BS 251 BETWEEN LBL 3.8 - LBL 15.3 FLIGHT DECK FLOOR WEB PER SRM 51-40-02;[02] LOCATED AND DRILLED NEW STIFFENER P/N:141A5136-11; LOT#1519516-1 AT BS 252; WL 208 BETWEEN LBL 3.8 AND LBL 15.3 PER SRM 51-40-05 AND DWG#141A5100 SH 158. OK TO INSTALL.;[03] VERIFIED CORRECTIVE ACTION STEP 2. VERIFIED OK TO INSTALL.;[04] INSATALLED NEW STIFFENER P/N:141A5136-11 BS 252; WL 208 BETWEEN LBL 3.8 AND LBL 15.3 PER SRM 51-40-02 AND DWG#141A5100 SH 158.;[05] VERIFIED CORRECTIVE ACTION STEP 4.;[06] COMPLETED STEP 2.;[07] VERIFIED STEP 2.;[08] STEP 1 COMPLETED;[09] VERIFIED STEP 1.;[10] REPAIRED BY REPLACEMENT STIFFENER P/N 141A5136-11 IAW SRM 51-10-02-0G-0 PARAGRAPH 9

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