Service difficulty report · Sidewall Support · Boeing 7377CT

Difficulty date
October 13, 2022
Submitted
November 17, 2022
Operation
Air carrier
Aircraft
N569WN
Make and model
Boeing 7377CT
Aircraft serial
33656
Aircraft time
66,340 hours, 34,395 cycles
Part
Sidewall Support
Condition
Corroded
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

CORROSION ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT RBL 21 BS 727D+3; BS 727D+5; BS 727D+6; BS 727D+8; BS 727D+10; BS 727D+19; BS 727E+2; BS 727E+6; BS 727E+10; BS 727E+12. / [01] VERIFIED APPLICABILITY SRM 53-60-53-01-2 FOR IDENTIFICATION AND SRM 53-00-53-1A-2 FOR ALLOWABLE DAMAGE. REMOVED CORROSION ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT RBL 21 BS 727E +10 IAW SRM 51-10-02. EVALUATED DAMAGE REMOVAL AT BLENDED AREA L=1.900' W=1.0' ORIGINAL THICKNESS 0.040' PER BAC1496-377 REMAINING 0.031' LOSS 0.009'; MAX MAT REMOVE ALLOWABLE 0.004'; FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2 PARA 4A (2) FIG 103 DETAIL D. TOOL ID: ATS1672 S/N: 65092939 DUE:03/2023;[02] VERIFIED CORRECTIVE ACTION STEP 1.;[03] LOCATED AND DRILLED NEW SIDEWALL SUPPORT P/N 146A7502-51 AT RBL 21 BS 727 TO BS 767 I.A.W SRM 51-40-05-0G-0 AND DWG 146A7502.;[04] VERIFIED CORRECTIVE ACTION #3.;[05] ALL WORK COMPLETED;[06] INSTALLATION IS DOCUMENTED ON CUSTOMER CARD #TTG8Q004D144;[07] VERIFIED ACTION #6;[08] VERIFIED MEASUREMENT FIELDS

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