You can contribute by submitting additional or updated information.
| Date: | Wednesday 31 December 2008 |
| Time: | 21:00 UTC |
| Type: |  Fokker 100 |
| Owner/operator: | Portugália |
| Registration: | CS-TPE |
| MSN: | 11342 |
| Year of manufacture: | 1991 |
| Fatalities: | Fatalities: 0 / Occupants: 23 |
| Other fatalities: | 0 |
| Aircraft damage: | Unknown |
| Category: | Incident |
| Location: | Waypoint ZMR, FL340 -
 Portugal
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Lisboa-Humberto Delgado Airport (LIS/LPPT) |
| Toulouse-Blagnac Airport (TLS/LFBO) | |
| Investigating agency: | GPIAA |
| Confidence Rating: |  Accident investigation report completed and information captured |
While en route at FL340, a Cabin Altitude warning was triggered. The cabin altitude was at 10,000 feet and was observed to be increasing at a rate of 1,000 feet per minute. The appropriate descent procedure was initiated. Due to the minimum safe altitude in the area, the aircraft was maintained at 14,000 feet. Air Traffic Control (ATC) was informed, and coordination was requested to return the flight to Lisbon Airport.
During the remainder of the flight, the cabin altitude continued to rise until it matched the aircraft’s flight level — 14,000 feet. After reaching this altitude, the cabin pressure began to descend until stabilizing at 3,500 feet. The landing was carried out without incident on Runway 03 at Lisbon Airport.
An investigation of the pressurization system found the presence of a piece of speed tape that had detached from the area where it had been used as part of a temporary repair. This tape appears to have been carried by the airflow within the pressurization system and became lodged near the outflow valve, interfering with its operation.
Accident investigation:
 |
|
Sources:
GPIAAF
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Apr-2025 09:55 | ASN | Added |
| 01-May-2025 17:06 | ASN | Updated [Time, Cn, Operator, Total occupants, Phase, Nature, Departure airport, Destination airport, Narrative, ] |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2025 Flight Safety Foundation