Service difficulty report · Angle · Boeing 7377H4

Difficulty date
June 12, 2022
Submitted
July 14, 2022
Operation
Air carrier
Aircraft
N488WN
Make and model
Boeing 7377H4
Aircraft serial
33853
Aircraft time
59,468 hours, 35,169 cycles
Part
Angle
Condition
Corroded
Location
Fuselage
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 FLOOR TO SIDEWALL ANGLE LBL 24.75; WL 156.5; BS 440+10.5; 14.5; 18.5; BS 460+10.5; 14.5; 18.5; BS 480+6; BS 500+5; 10.5; 14.5; BS 500A+2; 6.5; 10.5; 14.5; BS 500B+10.5 & 500C+6.5 10.5 14.5 / [01] VERIFIED APPLICABILITY SRM 53-30-53-0I-2 IDENTIFICATION 2 AND SRM 53-00-53-1A-2 ALLOWABLE DAMAGE ARE APPLICABLE TO THIS A/C;[02] REMOVED CORROSION ON FLOOR TO SIDEWALL ANGLE FROM BS 440 TO BS 500C + 10.5 LBL 24.75; WL 156.5 (23) PLACE; DISCREPANCY AREA BS 460 + 10.5 TO 14.5; L: 4' W: .800' D: 0.010; ORIGINAL THICKNESS 0.040' MAT. REMOVED 0.010' REMAINING MATERIAL 0.030' FOUND TO BE OUT OF LIMIT IAW SRM 53-00-53-1A-2.<BR><BR>TOOL USED ID: ATS1672 CAL DUE: 03/2023;[03] REMOVED FLOOR TO SIDEWALL ANGLE FROM BS 400 TO BS 500D LBL 24.75; WL 156.5 IAW SRM 51-40-02-0G-0;[04] VERIFIED SRM 53-00-53-1A-2 FOR ALLOWABLE DAMAGE IS APPLICABLE TO THIS FAULT.<BR>VERIFIED CORRECTIVE ACTION ITEM 2; DAMAGE TO FLOOR TO SIDEWALL ANGLE IS OUT OF LIMITS.;[05] LOCATED AND DRILLED NEW FLOOR TO SIDEWALL ANGLE WITH P/N 143A7501-183;LOT#1491510-1;IAW SRM 51-40-05;AND DWG#143A7500.;[06] VERIFIED CORRECTIVE ACTION #5 AND MEASUREMENT TABLE;[07] FLOOR TO SIDEWALL SUPPORT WILL BE INSTALL WITH THE CUSTOMER CARD # TTG8Q004EXYE. ALL MAINTENANCE ACTIONS ARE COMPLETE REQUEST FINAL BUYOFF.;[08] VERIFIED CORRECTIVE ACTION STEP 7. TASK CARD COMPLETE.;[09] VERIFIED MEASUREMENT TABLE.

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