What was found
L1 WINDOW CRACK DURING CRUISE AT FL400. WINDOW STARTED ARCING AND CRACKING, RAN WINDOW DAMAGE QRH. DESELECTED L FWD WINDOW HEAT, ARCING AND CRACKING STOPPED.
- Difficulty date
- July 17, 2025
- Submitted
- July 18, 2025
- Operation
- Air carrier
- Aircraft
- N948FD
- Make and model
- Boeing 757236
- Aircraft serial
- 25059
- Aircraft time
- 45,063 hours, 37,209 cycles
- System (JASC)
- 5610 · Flight Compartment Windows
- Part
- Window
- Part number
- 141W740047
- Part serial
- 18215H4601
- Condition
- Cracked
- Location
- Zone 200 L1
- Part time
- 3,970 hours, 2,668 cycles
- Stage of operation
- CR
- How discovered
- V
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.