# Comm system malf/failure

- Type: NTSB defining event
- NTSB code: 336
- CICTT category: System/Component Failure (Non-Powerplant)
- Defining event in: 15 cases
- In the sequence of: 20 cases
- Fatal cases: 1
- All cases: https://openairdocs.org/ntsb-events/336/cases.md
- Cases with it anywhere in the sequence: https://openairdocs.org/ntsb-events/336/sequence.md
- Page: https://openairdocs.org/ntsb-events/336

## Cases per year (defining / in the sequence)

- 2009: 0 / 1
- 2010: 0 / 1
- 2011: 0 / 1
- 2013: 1 / 1
- 2017: 1 / 1
- 2019: 1 / 1
- 2021: 2 / 2
- 2022: 2 / 2
- 2023: 4 / 5
- 2024: 1 / 2
- 2025: 2 / 2
- 2026: 1 / 1

## Phase of flight

- Approach: 4 cases
- Landing-landing roll: 2 cases
- Enroute: 2 cases
- Other: 1 cases
- Enroute-cruise: 1 cases
- Takeoff-rejected takeoff: 1 cases
- Takeoff: 1 cases
- Taxi-from runway: 1 cases
- Pushback/tow-engine not oper: 1 cases
- Standing-engine(s) operating: 1 cases

## In the probable cause of these cases

- [Not determined, general](https://openairdocs.org/ntsb-findings/05000000) (Not determined): 2 cases
- [Ground vehicle](https://openairdocs.org/ntsb-findings/03022025) (Environmental issues): 1 cases
- [Accuracy of communication](https://openairdocs.org/ntsb-findings/02063515) (Personnel issues): 1 cases
- [Incorrect action selection](https://openairdocs.org/ntsb-findings/02041010) (Personnel issues): 1 cases
- [Main landing gear attach sec](https://openairdocs.org/ntsb-findings/01023211) (Aircraft): 1 cases

## Aircraft models (registry)

- [Robinson Helicopter R44 II](https://openairdocs.org/model/robinson-helicopter-r44-ii): 1 cases
- [Mitsubishi MU-2B-60](https://openairdocs.org/model/mitsubishi-mu-2b-60): 1 cases
- [Embraer S A ERJ 170-200 LR](https://openairdocs.org/model/embraer-s-a-erj-170-200-lr): 1 cases
- [Curtiss Wright C-46F](https://openairdocs.org/model/curtiss-wright-c-46f): 1 cases
- [Boeing 737-8H4](https://openairdocs.org/model/boeing-737-8h4): 1 cases

## Newest cases

- [NTSB GAA26WA247](https://openairdocs.org/ntsb/GAA26WA247), May 21, 2026: Piper PA28 (SE-EOT), Roszczep, Poland, substantial damage
- [NTSB DCA26WA036](https://openairdocs.org/ntsb/DCA26WA036), Nov 22, 2025: Embraer ERJ170 (C-FRQM), Greenwich, CT, occurrence, no damage
- [NTSB ENG25WA046](https://openairdocs.org/ntsb/ENG25WA046), Jan 13, 2025: Airbus A321 (PH-YHA), Mérignac, France, incident, no damage
- [NTSB DCA24WA331](https://openairdocs.org/ntsb/DCA24WA331), Sep 20, 2024: Airbus A320 (EI-NSF), Bordeaux-Merignac, France, incident, no damage
- [NTSB GAA24WA051](https://openairdocs.org/ntsb/GAA24WA051), Aug 11, 2023: Diamond DA20-C1 (C-FRZG), Cooking Lake, Canada, 2 fatal
- [NTSB DCA23WA366](https://openairdocs.org/ntsb/DCA23WA366), Jul 16, 2023: Airbus A320 (EC-JTR), Barcelona, Spain, incident, minor damage
- [NTSB DCA23WA476](https://openairdocs.org/ntsb/DCA23WA476), Mar 10, 2023: Boeing 787 (AC9-FG), Dubai, United Arab Emirates, incident, no damage
- [NTSB DCA23WA475](https://openairdocs.org/ntsb/DCA23WA475), Mar 10, 2023: Boeing 737 (AC9-FG), Dubai, Qatar, incident, no damage
- [NTSB DCA22WA165](https://openairdocs.org/ntsb/DCA22WA165), Jul 30, 2022: drone Viper Pro (UNREG), Felthorpe, United Kingdom
- [NTSB GAA22WA116](https://openairdocs.org/ntsb/GAA22WA116), Jan 10, 2022: Cruiser PS-28 (EC-NKP), Casarrubios, Spain, substantial damage

NTSB has coded findings and defining events since 2008; earlier cases used its older occurrence and cause codes and aren't counted.

Findings: https://openairdocs.org/ntsb-findings.md. Defining events: https://openairdocs.org/ntsb-events.md. Phases of flight: https://openairdocs.org/ntsb-phases.md. Every investigation, filtered by finding, event, phase, state, year or model: https://openairdocs.org/ntsb.md (for example ?state=MI&fatal=1).

NTSB's definitions: Accident and incident, 49 CFR 830.2 (https://www.ecfr.gov/current/title-49/subtitle-B/chapter-VIII/part-830/subpart-A/section-830.2), CICTT occurrence categories (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/OccurrenceCategoryDefinitions.pdf), CICTT phases of flight (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/PhaseofFlightDefinitions.pdf), and NTSB coding manual, before 2008 (PDF) (https://www.ntsb.gov/GILS/Documents/codman.pdf). NTSB publishes no definitions for its findings, only their names.

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