Service difficulty report · Transition Panel · Boeing 737990ER

Difficulty date
August 27, 2025
Submitted
September 30, 2025
Operation
Air carrier
Aircraft
N471AS
Make and model
Boeing 737990ER
Aircraft serial
41703
Aircraft time
40,738 hours, 12,607 cycles
Part
Transition Panel
Part number
143A75014
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 CARGO TRANSITION PROFILE CORRODED AT STA 500L TO 500A AND BL 25R. GROUNDED - YES. REMOVED CORROSION AS REQ IN MULTIPLE AREAS. ORIG THICKNESS IS 0.040 PER SRM 53-30-53-01-02. LOWEST MATERIAL REMOVED WAS 0.020 REMAINING THICKNESS IS 0.020. FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2. REMOVED TRANSITION PANEL IAW SRM 51-40-02. FABRICATED REPAIR PARTS AND TRANSITION PANEL PN BAC1496444 7075-T62 PO 1131998.1 IAW SRM 53-00-53-2R-6, SRM 51-40-05 AND DWG 14347500 REV -. APPLIED PROTECTIVE TREATMENT TO PARTS IAW SRM 51-20-01. INSTALLED REPAIR PARTS AND TRANSITION PANEL IAW 51-40-02, SRM 53-00-53-2R-6 AND DWG 143A7500 REV -.