Service difficulty report · Support · Boeing 7377H4

Difficulty date
June 9, 2021
Submitted
July 19, 2021
Operation
Air carrier
Aircraft
N489WN
Make and model
Boeing 7377H4
Aircraft serial
33855
Aircraft time
54,253 hours, 32,244 cycles
Part
Support
Condition
Corroded
Location
Bs 727d-747
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 AFT CARGO BAY BS727D - BS747 LBL21 WL156. ; / [01] UPDATED MEASUREMENT TABLE; [02] EVALUATED CORROSION FROM 727D-747 DEEPEST MEASUREMENT WAS AT BS 767 FOUND 0.020 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 UNKOWN; [03] DEEPEST MEASUREMENT WAS AT BS727D+10 NOT BS767; [04] VERIFIED; [05] VERIFIED OUT OF LIMITS; [06] REMOVED ACB LH FLOOR TO SIDEWALL SUPPORT BS727 TO BS847; IAW SRM 51-40-02-0G-0; [07] LOCATED; DRILLED ;DEBURRED NEW FLOOR TO SIDEWALL SUPPORT ; BS 727 - BS 847 LBL 21 WL 156; PER SRM 51-40-05-0G-0; DWG 146A7500.; [08] VERIFIED LOCATED; DRILLED ;DEBURRED NEW FLOOR TO SIDEWALL SUPPORT ; BS 727 - BS 847 LBL 21 WL 156; PER SRM 51-40-05-0G-0; DWG 146A7500.; [09] UPDATED PARTS TABLE; [10] OK TO INSTALL FLOOR TO SIDEWALL SUPPORT ACB BS 727-847; LBL 21; WL 156.; [11] OK TO INSTALL; [12] INSTALLED FLOOR TO SIDEWALL SUPPORT ACB BS 727-847; LBL 21; WL 156 IAW SRM 51-40-02-0G-0; DWG# 146A7500.; [13] VERIFIED INSTALLED FLOOR TO SIDEWALL SUPPORT ACB BS 727-847; LBL 21; WL 156 IAW SRM 51-40-02-0G-0; DWG# 146A7500.; [14] COMPLETED

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