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| Date: | Tuesday 8 February 2022 |
| Time: | 06:25 UTC |
| Type: |  Boeing 767-332ER (WL) |
| Owner/operator: | Delta Air Lines |
| Registration: | N1602 |
| MSN: | 29694/735 |
| Year of manufacture: | 1999 |
| Total airframe hrs: | 99721 hours |
| Engine model: | GE CF6-80C2B6F |
| Fatalities: | Fatalities: 0 / Occupants: 68 |
| Other fatalities: | 0 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | over Galicia -
 Spain
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | New York-John F. Kennedy International Airport, NY (JFK/KJFK) |
| Madrid-Barajas Adolfo Suárez Airport (MAD/LEMD) | |
| Investigating agency: | CIAIAC |
| Confidence Rating: |  Accident investigation report completed and information captured |
Delta Air Lines flight DL126, a Boeing 767-300, took off from New York-John F. Kennedy International Airport at 00:44 UTC, bound for Madrid Barajas International Airport, Spain.
After approximately two hours of flight, the crew received an indication of failure of the automatic cabin pressurization system. From that moment on, the crew began to manually control the cabin pressure.
About 06:25 UTC, when it was flying over Galicia, the cabin was depressurized. The crew had to use the oxygen masks and the oxygen masks were deployed for the passengers. The crew declared an emergency, descended and were later able to continue the flight, landing normally at the destination airport.
The occupants of the aircraft were uninjured and the aircraft was not damaged.
Causes/contributing factors
The investigation has revealed that the incident was caused by water leaking from a tube with a broken clamp which, when it froze, blocked the outflow valve doors.
The following factors are thought to have contributed:
• The use of plastic tube clamps in the vicinity of the OFV (section 46), the deterioration of which had previously caused leaks in other incidents in the avionics compartment (section 41), where they had since been replaced by metal clamps.
• The absence of a fault in the BITE ground test performed prior to the flight.
• The fact that there is no requirement to perform a visual inspection of the OFV during Task 803 of 21-31 of the FIM when the automatic pressurisation system becomes inoperative in flight, the manual operation is normal, and the BITE does not detect a fault on the ground.
The incident aircraft was ferried back to New York on 10 February 2022 and resumed service on February 14.
Accident investigation:
 |
|
Sources:
https://www.mitma.es/organos-colegiados/ciaiac/investigacion/2022/in-005-2022
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Mar-2022 17:25 | harro | Added |
| 13-Dec-2023 20:19 | harro | Updated [Other fatalities, Narrative, Accident report] |
Corrections or additions? ... Edit this accident description
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