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ASN Wikibase Occurrence # 219580
Last updated: 3 September 2021
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Time:03:45 UTC
Type:Silhouette image of generic A320 model; specific model in this crash may look slightly different
Airbus A320-231
Owner/operator:Iranair Tours Co.
Registration: EP-TTA
MSN: 393
Fatalities:Fatalities: 0 / Occupants: 165
Other fatalities:0
Aircraft damage: None
Category:Serious incident
Location:NE of Ahwaz -   Iran
Phase: En route
Nature:Passenger - Non-Scheduled/charter/Air Taxi
Departure airport:Tehran-Mehrabad Airport (THR/OIII)
Destination airport:Ahwaz Airport (AWZ/OIAW)
At FL340 the cabin pressure dropped. All persons on board used oxygen masks as the aircraft made an emergency descent to FL140. A safe landing was carried out at 04:24 UTC.
The aircraft was ferried back to Tehran at FL250 later that day and re-entered service on November 27.

Some facts and findings observed on the incident scenario which help to conclusion of the incident as:
- The aircraft was operated based on MEL but technical failure of Air bleed #2 caused supporting low quantity of demanded air for both pack system and wing anti-ice system.
- The crew did not follow the procedures descripted in OEB 40.01 and MEL timely. Including Approach climb performance penalty of 2400 kg as per MEL Flight Preparation/ Limitation.
- Flight crew made several mistakes in normal flying procedures (MTOW calculation, SID, LVL OFF & approach).
- Flight crew did not follow emergency descend procedure as per AIRBUS & AIP instructions & procedures.


Other occurrences involving this aircraft

13 Aug 2016 EP-TTA Atrak Air 0 Tehran-Mehrabad Airport (THR/OIII) min
Runway excursion.


Photo of EP-TTA courtesy

Tehran - Mehrabad International (OIII / THR)
31 January 2019; (c) Dara Zarbaf

Revision history:

16-Dec-2018 14:42 harro Added
30-May-2020 06:54 KagurazakaHanayo Updated [Total occupants, Departure airport, Destination airport, Source, Narrative]

Corrections or additions? ... Edit this accident description