Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
April 21, 2022
Submitted
May 5, 2022
Operation
Air carrier
Aircraft
N927WN
Make and model
Boeing 7377H4
Aircraft serial
36889
Aircraft time
45,530 hours, 27,478 cycles
Part
Intercostal
Part number
146A81237
Condition
Corroded
Location
Aft Cargo Bay
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 INTERCOSTAL AT RBL 20 BS 767+5. / [01] REMOVED CORROSION ON AFT CARGO BAY INTERCOSTAL AT RBL 20 BS 767+5. L = 2.7' W = 1.1' Y = 0.041' MAT. LOSS 0.009; ORIGINAL THICKNESS 0.050' FOUND TO BE OUT OF LIMITS IAW SRM 53-60-15-1A-1 STEP 4G(2) B FIG 103 DETAIL G.<BR>TOLL MICROMETER PIN POINT ID ATS 1672 SN: 65092939 CALL DUE 03/2023;[02] REMOVED INTERCOSTAL AT AFT CARGO BAY RBL 20 BS767 -BS787 IAW SRM 51-40-02;[03] VERIFIED CORRECTIVE ACTION #1.;[04] LOCATED AND DRILLED NEW INTERCOSTAL WEB LOT: 1482081-1; IAW SRM 51-40-05 AND DWG 146A0081. OK TO INSTALL;[05] VERIFY APPLICABILITY BY SRM 53-60-15-1A-1; WAS FOUND OUT OF LIMIT.;[06] CORRECTED ITEM 5; VERIFIED APPLICABILITY BY SRM 53-60-15-1A-1 TO THIS REPAIR.;[07] VERIFIED APPLICABILITY OF SRM 53-60-15-1A-1 FOR LIMITS. PART WILL BE REPAIRED BY REPLACEMENT. VERIFIED DRILL UP OF NEW PART PER CORRECTIVE ACTION ITEM 4.<BR>OKAY TO INSTALL PART GIVEN.;[08] INSTALLED NEW INTERCOSTAL WEB AT BS767 - BS787; IAW SRM 51-40-02 AND DWG 146A0081.;[09] VERIFIED CORRECTIVE ACTION #8;[10] UPDATED MEASUREMENTS

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