What: Southwest Airlines Boeing 737-3H4 en route from Phoenix to Sacramento
Where: Yuma International Airport, AZ
When: 01 APR 2011
Who: 118 aboard
Why: A hole burst through the top of this Boeing while en route. The plane suffered decompression, descended to a safe level (when an attendant was injured) and made an emergency landing in Yuma.
The hole has opened a witch hunt on aging Boeings in search of the kind of metal fatigue that would result in a hole during operations now that the aluminum skin has been known to separate at the lap joints, where panels are spliced together. Although the incident did not result in death, it is being taken as a “warning.” 175 Boeing 737 are slated for examination, and maintenance programs (Southwest, FAA, Boeing) are being re-evaluated to take this into account.
Discussion of lap joint and the 3 rows of rivets. The skin separated at the lower rivet line. Pre-existing fatigue existed on the fracture surface. (Multi site damage.) The decompression happened 18.5 minutes after take-off, and no pre-indications. The flight crew immediately declared emergency.