Service difficulty report · Transition Panel · Boeing 737990ER

Difficulty date
March 20, 2025
Submitted
April 23, 2025
Operation
Air carrier
Aircraft
N457AS
Make and model
Boeing 737990ER
Aircraft serial
36355
Aircraft time
37,855 hours, 11,929 cycles
Part
Transition Panel
Part number
143A7501192
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

FWD PIT R/H TRANSITION PANEL HAS SPOTS OF CORROSION FROM STA.500B TO 500L. GROUNDED - YES. REMOVED CORROSION IAW B737-900 SRM 53-00-53 ORIG. THICKNESS .040 REMOVED .020 REMAINING .020 FOUND TO BE OUT OF LIMITS IAW B737-900 SRM 53-00-53 T8224B 02/DEC/2025 LOCATED, DRILLED AND TREATED REPAIR PARTS IAW B737-900 SRM 53-00-53 ASSEMBLED AND INSTALLED REPAIR PARTS IAW B737-900 SRM 53-00-53 BAC DWG'S 143A7501 REV A, 143A7500 REV- AND 143A7505 REV-.