# NTSB DCA24WA107: Boeing 737, Tapachula, Mexico, February 21, 2024

- Type: NTSB incident investigation
- Classification: Incident · Class 5 · Foreign
- Date: February 21, 2024, 18:29 local (18:29 UTC)
- Place: Tapachula, Mexico
- Phase of flight: [Unknown](https://openairdocs.org/ntsb-phases/990) (OpenAirDocs' grouping)
- Defining event: [Unknown: Near midair/TCAS alert/loss of separation](https://openairdocs.org/ntsb-events/260)
- 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): 193844
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DCA24WA107
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/193844/pdf
- Page: https://openairdocs.org/ntsb/DCA24WA107

## Sequence of events

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

- [Unknown: Near midair/TCAS alert/loss of separation](https://openairdocs.org/ntsb-events/260) (defining event), aircraft 1; cases with it: [All aircraft, 96 cases](https://openairdocs.org/ntsb-events/260/sequence.md)

## Aircraft 1

- Registration: XA-ADU (not matched to a registry record)
- Reported make and model: BOEING 737
- Category: Airplane
- Damage: No damage
- Flight: Non-U.S., commercial

## Aircraft 2

- Registration: [N421RN](https://openairdocs.org/aircraft/N421RN), registered now, S/N 421C0263 (OpenAirDocs)
- Reported make and model: CESSNA 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (registry code 2076016) (OpenAirDocs)
- Registry engine: [Continental GTSIO-520-C](https://openairdocs.org/engine/continental-gtsio-520-c) (registry code 17035, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 421C0263
- Damage: No damage

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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