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SDR ASAA2025081260444

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Service difficulty report · Transition Panel · Boeing 737990ER

FAA SDR system

Difficulty date
August 12, 2025
Submitted
September 2, 2025
Operation
Air carrier
Aircraft
N481AS
Make and model
Boeing 737990ER
Aircraft serial
44106
Aircraft time
37,117 hours, 11,501 cycles
System (JASC)
5320 · Fuselage Miscellaneous Structure
Part
Transition Panel
Part number
146A750242
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

AFT CARGO COMPARTMENT RT FLOOR TRANSITION PANEL BS 7271+9 TO BS 767, RBL21 UPPER AND LOWER SURFACE HAS AREAS OF CORROSION. GROUNDED - YES. REMOVED CORROSION, ORIGINAL THICKNESS .040, REMOVED .040, REMAINING .000. FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2. REMOVED TRANSITION PANEL, FABRICATED REPAIR PARTS USING BAC1496-377, ALODINE, PRIMED AND INSTALLED IAW SRM 53-00-53-2R-5.