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
Fuselage
Stage of operation
IN
How discovered
V
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 BS500A - BS500D RBL23 WL156. ; / [01] EVALUATED CORROSION ON FLOOR TO SIDEWALL SUPPORT FOUND 0.020 REMOVED FROM ORIG 0.040 DEEPEST LOCATION AT BS 500B+10; 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 500B+10; 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 RH FLOOR TO SIDEWALL SUPPORT BS500A TO 500D IAW SRM 5140-02-0G-0; [04] LOCATED AND DRILLED NEW RH FLOOR TO SIDEWALL SUPPORT BE500A TO BS500D; IAW SRM 51-40-02-0G-0 ; SRM 51-40-05-0G-0.; [05] ADDED DRAWING 143A7500; [06] CERTIFIED STEP 5; [07] UPDATED PART REQUIREMENT; [08] VERIFIED LOCATED AND DRILLED NEW RH FLOOR TO SIDEWALL SUPPORT BE500A TO BS500D; IAW SRM 51-40-02-0G-0 ; SRM 51-40-05-0G-0.DRAWING 143A7500.; [09] OK TO INSTALL FCB RH FLOOR TO SIDEWALL SUPPORT BS500A-500D; [10] VERIFIED OK TO INSTALL FLOOR TO SIDEWALL SUPPORT BS 500A- 500D.; [11] INSTALLED FCB RH FLOOR TO SIDEWALL SUPPORT BS500A-500D; IAW SRM 51-40-02-0G-0; DWG143A7500; [12] VERIFIED INSTALLED FCB RH FLOOR TO SIDEWALL SUPPORT BS500A-500D; IAW SRM 51-40-02-0G-0; DWG143A7500.; [13] RE-VERIFIED INSTALLED FCB RH FLOOR TO SIDEWALL SUPPORT BS500A-500D; IAW SRM 51-40-02-0G-0; DWG143A7500.

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