# NTSB DCA23WA136: Mcdonnell Douglas DC-9-82, Kermanshah, Iran, January 23, 2023

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Class 5 · Foreign
- Date: January 23, 2023, 08:30 local (08:30 UTC)
- Place: Kermanshah, Iran
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Defining event: [Enroute-cruise: Pressure/environ sys malf/fail](https://openairdocs.org/ntsb-events/331)
- Highest injury: No injuries
- Injuries: 135 uninjured
- Status: Led by another country's authority
- Investigation class: Class 5 - No publish
- NTSB office: Major Investigations Division
- Lead agency: Other
- NTSB case key (mKey): 106636
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DCA23WA136
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/106636/pdf
- Page: https://openairdocs.org/ntsb/DCA23WA136

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Enroute-cruise: Pressure/environ sys malf/fail](https://openairdocs.org/ntsb-events/331) (defining event); cases with it: [All aircraft, 116 cases](https://openairdocs.org/ntsb-events/331/sequence.md)

## Aircraft

- Registration: EP-ZAA (not matched to a registry record)
- Reported make and model: MCDONNELL DOUGLAS DC-9-82
- Category: Airplane
- Damage: No damage
- Fire: Unknown
- Flight: Part 129
- Operator: Zagros Airlines
- Registered owner: Zagros Airlines
- Departed: OIBK, Kish Island
- Destination: Same as departure

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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