Service difficulty report · Transition Panel · Boeing 737990ER

Difficulty date
February 13, 2026
Submitted
February 23, 2026
Operation
Air carrier
Aircraft
N251AK
Make and model
Boeing 737990ER
Aircraft serial
62470
Aircraft time
34,790 hours, 11,280 cycles
Part
Transition Panel
Part number
143A7501192
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

WHILE GAINING ACCESS TO REPLACE BONDED NUTPLATES AT STA 500J; FOUND R/H TRANSITION PANEL CORRODED FROM STATIONS 500H TO 500L RBL 25. GROUNDED - YES. REMOVED CORROSION AND FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2 ORIGINAL THICKNESS .040, MATERIAL REMOVED .035, MATERIAL REMAINING .005. REMOVED AND REPLACED SECTION OF TRANSITION PANEL BETWEEN BS 500+20 TO 500L IAW SRM 51-40-02 AND DWG 143A7500, REV-, AND SRM 53-00-53-2R-5. REMOVED AND REINSTALLED FLOOR PANEL 120EF IAW AMM 25-52-10-400-801.