Service difficulty report · Support · Boeing 7377H4

Difficulty date
June 23, 2021
Submitted
August 4, 2021
Operation
Air carrier
Aircraft
N940WN
Make and model
Boeing 7377H4
Aircraft serial
36900
Aircraft time
39,596 hours, 24,067 cycles
Part
Support
Condition
Corroded
Location
Bs 500-500c
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

BS500-500C LBL24.5 WL157 FLOOR TO SIDEWALL SUPPORT IS CORRODED. / [01] EVALUATED CORROSION FROM BS 500-500C FOUND DEEPEST LOCATION AT BS 500B FOUND 0.015 REMOVED FROM ORIG 0.040 FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 USING MICROMETER P/N 4566A S/N UNKNOWN; [02] VERIFIED CORROSION TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2; [03] REMOVED FCB L/H FLOOR TO SIDEWALL SUPPORT BS400-BS500D; RBL24.5; WL157 PER SRM 51-40-02-0G-0; [04] * CORRECTION * L/H FLOOR TO SIDEWALL SUPPORT BS 400 TO BS500D L/B 24.5 WAS NOT REMOVED; [05] CERTIFIED STEP 3; [06] REMOVED FCB L/H FLOOR TO SIDEWALL SUPPORT BS400-BS500D; LBL24.5; WL157 PER SRM 51-40-02-0G-0; [07] VERIFIED STEP 6 REMOVED FCB L/H FLOOR TO SIDEWALL SUPPORT BS400-BS500D; LBL24.5; WL157 PER SRM 51-40-02-0G-0; [08] LOCATED AND DRILLED FCB NEW FLOOR TO SIDEWALL SUPPORT BS396-500D LBL24 IAW SRM 51-40-02-0G-0; DWG143A7500; [09] VERIFIED CORRECTIVE ACTION ITEMS 3-8; [10] OK TO INSTALL; [11] OK TO INSTALL; [12] INSTALLED FLOOR TO SIDEWALL SUPPORT BS500D-396 LBL25 WL 157 IAW SRM 51-40-02-0G-0; DWG 143A7505 AND 143A7500.; [13] VERIFIED FLOOR TO SIDEWALL SUPPORT BS500D-396 LBL25 WL 157 INSTALLED IAW SRM 51-40-02-0G-0; DWG 143A7505 AND 143A7500; [14] COMPLETE

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