Service difficulty report · Support · Boeing 7377H4

Difficulty date
August 26, 2021
Submitted
September 13, 2021
Operation
Air carrier
Aircraft
N966WN
Make and model
Boeing 7377H4
Aircraft serial
36966
Aircraft time
32,714 hours, 19,999 cycles
Part
Support
Part number
143A750180
Condition
Corroded
Location
Bs 500b-500d
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 SUPPORT AT B.S. 500B-500D; L.B.L. 24; W.L. 154. ; / REMOVED CORROSION ON FLOOR TO SIDEWALL SUPPORT AT B.S. 500B-500D; L.B.L. 24; W.L. 154 IAW SRM 51-10-02-0G-0. CORRODED AREA MEASURES 40'L X 4'W. REMOVED .006' OF MATERIAL. ORIGINAL THICKNESS = .045'CORROSION DAMAGE FOUND TO BE OUT OF ALLOWABLE DAMAGE LIMITS IAW SRM 53-00-53-1A-2. REPAIR BY REPLACEMENT IAW SRM 51-10-02-0G-0] REMOVED FCB L/H FLOOR TO SIDEWALL SUPPORT IAW SRM 51-40-02; [06] FABRICATED NEW FLOOR TO SIDEWALL SUPPORT AT B.S. 400-500D; L.B.L. 24; W.L. 154 FROM BAC1496-444; LOT#1466509-1 IAW SRM 51-40-05; SRM 53-00-53-2R-5 4. A-H; BOEING DWG 143A7501; AND BOEING DWG 143A7500. OK TO TREAT AND PRIME; [07] FABRICATED NEW FLOOR TO SIDEWALL SUPPORT AND REPAIR SPLICE AT B.S. 400-500D; L.B.L. 24; W.L. 154 FROM BAC1496-444; LOT#1466509-1 IAW SRM 51-40-05; SRM 53-00-53-2R-5 4. A-H; BOEING DWG 143A7501; AND BOEING DWG 143A7500. OK TO TREAT AND PRIME; [08] VERIFIED FABRICATION OF SUPPORT AND SPLICE REPAIR PARTS PER SRM 51-40-05; SRM 53-00-53-2R-5 AND DWG 143A7501 AND DWG 143A7500 INSTALLED SIDEWALL SUPPORT AT BS 396 TO 500D LBL 24 WL 154. IAW DWG:143A7500 AND SRM 51-40-02 INSTALLED SIDEWALL SUPPORT AT BS 396 TO 500D LBL 24 WL 154. IAW DWG:143A7500 AND SRM 51-40-02

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