Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
April 27, 2022
Submitted
May 31, 2022
Operation
Air carrier
Aircraft
N479WN
Make and model
Boeing 7377H4
Aircraft serial
33990
Aircraft time
59,976 hours, 35,850 cycles
Part
Intercostal
Part number
141A56901
Condition
Corroded
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

INTERCOSTAL HAS CORROSION BETWEEN STA 294.50 TO STA 312;LBL12. CORRECT LBL 11.16. REMOVED CORROSION AT INTERCOSTAL BETWEEN STA 294.50 TO STA 312 LBL12. WL 208 IN REF B737-700 SRM 51-10-02-0G-0.REMOVED INTERCOASTAL BETWEEN STA 294.5 TO STA 312; LBL 12 IN REF WITH B737-700 SRM 51-40-02-0G-0. LOCATED AND DRILLED INTERCOSTAL BETWEEN FS 294.50 TO FS 312 LBL 12 WL 208.1 IN REF B737-700 SRM 51-40-05-0G-0;ORIGINAL MAT. 0.070'; MATERIAL REMOVED 0.031'; MAT. REMAINING 0.039'; FOUND OUT OF LIMITS REF. B737-7 SRM 53-10-51-1A-1 ALLOWABLE DAMAGE 1; REMOVED AND REPLACED INTERCOSTAL BETWEEN STA.294.5 TO STA.312; LBL11.16; REF. B737-7 SRM 51-40-02-0G-0 AND DRW #141A5600;

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