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 500-500d
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 BS500 - BS500D LBL23 WL156. ; / [01] EVALUATED CORROSION ON FLOOR TO SIDEWALL SUPPORT FOUND 0.020 REMOVED FROM ORIG 0.040 DEEPEST LOCATION AT BS 500C+5; FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 USING DEPTH GAUGE P/N ATS 400 S/N UNKNOWN; [02] VERIFIED EVALUATED CORROSION ON FLOOR TO SIDEWALL SUPPORT FOUND 0.020 REMOVED FROM ORIG 0.040 DEEPEST LOCATION AT BS 500C+5; FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 USING DEPTH GAUGE P/N ATS 400 S/N UNKNOWN; [03] REMOVED FCB LH FLOOR TO SIDEWALL SUPPORT BS396 TO BS500D IAW SRM 51-40-02-0G-0; [04] LOCATED AND DRILLED NEW LH FLOOR TO SIDEWALL SUPPORT BS396 TO BS500D IAW SRM 51-40-05-0G-0; SRM 51-40-02-0G-0; [05] ADDED DRAWING 143A7500; [06] CERTIFIED STEP 4 AND 5; [07] UPDATED PARTS TABLE; [08] VERIFIED LOCATED AND DRILLED NEW LH FLOOR TO SIDEWALL SUPPORT BS396 TO BS500D IAW SRM 51-40-05-0G-0; SRM 51-40-02-0G-0 DRAWING 143A7500; [09] OK TO INSTALL FLOOR TO SIDEWALL SUPPORT BE 396-500D; LBL 23; WL 156.; [10] OK TO INSTALL FLOOR TO SIDEWALL SUPPORT BE 396-500D; LBL 23; WL 156.; [11] INSTALLED FLOOR TO SIDEWALL SUPPORT BE 396-500D; LBL 23; WL 156 IAW SRM 51-40-02-0G-0; DWG# 143A7500; DWG# 143A7505; [12] VERIFIED THE INSTALLATION OF THE FLOOR TO SIDEWALL SUPPORT BE 396-500D; LBL 23; WL 156; [13] VERIFIED TASK IS COMPLETE

More about the Boeing 737-7H4