Service difficulty report · Support Angle · Boeing 75724APF

Difficulty date
July 23, 2025
Submitted
August 14, 2025
Operation
Air carrier
Aircraft
N433UP
Make and model
Boeing 75724APF
Aircraft serial
25464
Aircraft time
30,544 hours, 21,715 cycles
Part
Support Angle
Part number
148N31521
Condition
Corroded
Location
Zone 200
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

UPON REMOVING APU INLET ASSY, FOUND FWD LWR ANGLE AT STA. 1745, UPR MID AND LWR MID ANGLES BETWEEN BS 1825 AND 1745, TO BE CORRODED. REMOVED 4 EA ANGLES, FWD LWR AND FWD UPR ANGLES AT BS 1784, UPR MID AND LWR MID ANGLES P/N 148N3152-2, P/N 148N3152-1 BETWEEN STA. 1825 - STA 1784.LOCATED AND DRILLED NEW FWD STRAP AT STA 1787 BETWEEN STR 3R -STR 6R AT APU INLET ASSY IAW SRM 51-40-05-0G-0.FABRICATED ANGLES FOR APU INLET ASSY SUPPORT, IAW 148N3141/SAMPLE AND 148N3152/SAMPLE.INSTALLED NEW FWD STRAP, NEW LOWER MIDDLE ANGLES FWD LOWER AND FORWARD UPPER ANGLES.

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