Service difficulty report · Stiffener · Boeing 75724APF

Difficulty date
July 21, 2025
Submitted
August 7, 2025
Operation
Air carrier
Aircraft
N469UP
Make and model
Boeing 75724APF
Aircraft serial
25485
Aircraft time
35,720 hours, 21,553 cycles
Part
Stiffener
Part number
149N7523
Condition
Corroded
Location
Zone 100
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

EVIDENCE OF CORROSION ON CHANNEL UPPER L/H STA 1120. REMOVED CORROSION ON T-CHORD ORIGINAL MEASURES THICKNESS: 0.050''. AFTER BLENDED FOUND FOLLOWING MEASUREMENTS: L:2.1, W:1.2, DEPTH: 0.007'', REMAINING MAT.: 0.043'', %DAMAGE:14%. REMOVED STIFFENER STA 1220 AND RBL 50. IAW B757-200 SRM 51-40-02. TREATED AND PRIMED IAW B757-200PF SRM 51-20-01. INSTALLED STIFFENER FASTENER P/N BACB30NX6K3 AND BACB30NX6K6 BATCH#0004415262 COLLARS P/N BACC30N6 BATCH#0004384214.

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