What was found
CORROSION ON FCB SUB THRESHOLD WEB BETWEEN BS 440 - 492, RBL 25, WL 156. P 5 REJECT DUE TO COMMON STRUCTURE TO SUB-THRESHOLD HAS BEEN COUNTERSINK. REMOVED AND REPLACED FCB THRESHOLD WEB IAW SRM 51-40-02-0G-0, DWG 143A8330, REV B.
- Difficulty date
- May 19, 2026
- Submitted
- June 23, 2026
- Operation
- Air carrier
- Aircraft
- N8646B
- Make and model
- Boeing 7378H4
- Aircraft serial
- 36935
- Aircraft time
- 39,772 hours, 19,344 cycles
- System (JASC)
- 5320 · Fuselage Miscellaneous Structure
- Part
- Threshold Web
- 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.