Service difficulty report · Support · Boeing 7377H4

Difficulty date
March 8, 2023
Submitted
April 12, 2023
Operation
Air carrier
Aircraft
N956WN
Make and model
Boeing 7377H4
Aircraft serial
36672
Aircraft time
38,869 hours, 23,696 cycles
Part
Support
Condition
Corroded
Location
Zn 100 Fus Lower
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 AFT CARGO BAY SIDEWALL SUPPORT AT BS 727C+19 STRINGER 20R; 25R.(MARKED)<[01] EVALUATED BLEND. BLEND AT BS 727C+19 1 X 0.9-D 0.09. ORIGINAL THICKNESS IS 0.040 (BLEND IS OUT OF LIMITS) PER SRM 53-00-53-1A-2 CAL TOOL ATS2588 SERIAL#:F00991 DUE: 2/29/2024;[02] CORRECTION TO LINE 1. REMOVED CORROSION. EVALUATED BLEND. BLEND AT BS 727C+19 1 X 0.9-D 0.09. ORIGINAL THICKNESS IS 0.040 (BLEND IS OUT OF LIMITS) PER SRM 53-00-53-1A-2 CAL TOOL ATS2588 SERIAL#:F00991 DUE: 2/29/2024;[03] FIXED MEASUREMENTS;[04] UPON FURTHER INVESTIGATION THERE IS NO DAMAGE LIMITS FOR THIS PART. PART IS (OUT OF LIMITS).;[05] CORRECTION TO LINE 4 UPON FURTHER INVESTIGATION THERE IS NO DAMAGE LIMITS FOR THIS PART. PART IS (OUT OF LIMITS). SRM 51-10-02;[06] SRM 51-10-02 IS FOUND TO BE APPLICABLE FOR THIS EVAL.;[07] VERIFIED CORRECTIVE ACTIONS 2; 5; 6; AND MEASUREMENT TABLE.;[08] REMOVED ON AFT CARGO BAY; SIDEWALL SUPPORT AT BS 727C+19 IAW SRM 51-40-02-0G-0;[09] LOCATED AND DRILLED NEW SUPPORT PO 1430180 IAW SRM 51-40-05-0G-0;[10] VERIFIED CORRECTIVE ACTION STEP 9.;[11] REQ. OK TO INSTALL SIDE WALL SUPPORT BS 727C +19;[12] OK TO INSTALL SIDEWALL SUPPORT BS 727C+19 GIVEN;[13] INSTALLED SIDE WALL SUPPORT AT BS 727C + 19 IAW SRM 51-40-02-0G-0 AND DWG 146A1220 REV.-;[14] VERIFIED CORRECTIVE ACTION 13 INSTALLATION;[15] UPDATED MEASUREMENTS PARAMETERS ITEM 20.;[16] CERTIFIED MEASUREMENT TABLE UPDATE. ITEM 20 ONLY;[17] TASK CARD COMPLETED;[18] VERIFIED MEASUREMENT TABLE. TASK COMPLETE

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