# Engine bleed air system, general

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft power plant](https://openairdocs.org/ntsb-findings/0105) › [Engine bleed air system](https://openairdocs.org/ntsb-findings/010575) › Engine bleed air system, general
- NTSB code: 01057500
- Cases: 7
- In the probable cause: 4
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-findings/01057500/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01057500/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01057500

## Cases per year (in the probable cause / all)

- 2009: 1 / 1
- 2011: 1 / 1
- 2016: 1 / 1
- 2017: 0 / 1
- 2019: 1 / 1
- 2021: 0 / 1
- 2023: 0 / 1

## Defining events in these cases

- [Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342): 2 cases
- [Powerplant sys/comp malf/fail](https://openairdocs.org/ntsb-events/340): 2 cases
- [Birdstrike](https://openairdocs.org/ntsb-events/901): 1 cases
- [Part(s) separation from AC](https://openairdocs.org/ntsb-events/338): 1 cases
- [Fire/smoke (non-impact)](https://openairdocs.org/ntsb-events/150): 1 cases

## Aircraft models (registry)

- [Piper PA46-500TP](https://openairdocs.org/model/piper-pa46-500tp): 1 cases
- [Lockheed C-130A](https://openairdocs.org/model/lockheed-c-130a): 1 cases
- [Bombardier CL-600-2C11](https://openairdocs.org/model/bombardier-cl-600-2c11): 1 cases
- [Boeing 737-8](https://openairdocs.org/model/boeing-737-8): 1 cases
- [Bell UH-1B](https://openairdocs.org/model/bell-uh-1b): 1 cases
- [Bell 47G-3B-1](https://openairdocs.org/model/bell-47g-3b-1): 1 cases
- [Air Tractor AT-602](https://openairdocs.org/model/air-tractor-at-602): 1 cases

## Other findings in the same cases

- [Adequacy of policy/proc](https://openairdocs.org/ntsb-findings/04021015) (Organizational issues): 1 cases
- [Manufacture/production, general](https://openairdocs.org/ntsb-findings/04013000) (Organizational issues): 1 cases
- [Animal(s)/bird(s)](https://openairdocs.org/ntsb-findings/03022045) (Environmental issues): 1 cases
- [Maintenance, general](https://openairdocs.org/ntsb-findings/02062000) (Personnel issues): 1 cases
- [Fluids, general](https://openairdocs.org/ntsb-findings/01071000) (Aircraft): 1 cases
- [Directional control](https://openairdocs.org/ntsb-findings/01062020) (Aircraft): 1 cases
- [Eng oil sys (airframe furnish), general](https://openairdocs.org/ntsb-findings/01057900) (Aircraft): 1 cases
- [Compressor bleed valve](https://openairdocs.org/ntsb-findings/01057532) (Aircraft): 1 cases
- [Engine anti-icing system](https://openairdocs.org/ntsb-findings/01057510) (Aircraft): 1 cases
- [Compressor section](https://openairdocs.org/ntsb-findings/01057230) (Aircraft): 1 cases

## Newest cases

- [NTSB DCA24LA330](https://openairdocs.org/ntsb/DCA24LA330), Dec 20, 2023: Boeing 737-8 (N8830Q), Kenner, LA, incident, minor damage. Probable cause: A partial loss of engine power due to bird ingestion in the No. 1 (left) engine, which resulted in the activation of the load reduction device to prevent vibration. The load reduction device…
- [NTSB ERA21LA287](https://openairdocs.org/ntsb/ERA21LA287), Jul 6, 2021: Piper PA46-500TP (N31062), Manteo, NC, substantial damage. Probable cause: The improperly secured pneumatic compressor discharge air (P3) line coupling nut on the engine, which ultimately allowed the nut to back off resulting in a partial loss of engine power.
- [NTSB WPR19LA242](https://openairdocs.org/ntsb/WPR19LA242), Aug 26, 2019: Lockheed C130 (N119TG), Santa Barbara, CA, substantial damage. Probable cause: The failure of the No. 3 bleed air duct due to corrosion, which resulted in numerous system failures and the pilot’s inability to maintain directional control during the landing roll.
- [NTSB DCA17LA182](https://openairdocs.org/ntsb/DCA17LA182), Jul 2, 2017: Bombardier CL 600 2C10 (N796SK), Denver, CO, substantial damage. Probable cause: The fuel supply tube fitting pulling out of the left engine’s operability bleed valve (OBV) during the landing rollout, allowing fuel to leak and contact hot engine cases, which ignited a fire that…
- [NTSB WPR16LA104](https://openairdocs.org/ntsb/WPR16LA104), May 7, 2016: Bell UH 1B (N486SA), Maxwell, CA, substantial damage. Probable cause: A reduction in available engine power during takeoff due to a stuck hot air valve, which resulted in low rotor rpm and a forced landing. Contributing to the accident was the lack of dry film…
- [NTSB CEN11LA370](https://openairdocs.org/ntsb/CEN11LA370), May 25, 2011: Bell 47G-3B-1 (N96SH), Lakeville, MN, substantial damage. Probable cause: The loss of engine power due to a loose B-nut on the compressor discharge pressure bleed line.
- [NTSB CEN09LA401](https://openairdocs.org/ntsb/CEN09LA401), Jun 30, 2009: Air Tractor AT-602 (N5192T), Knobel, AR, substantial damage. Probable cause: The failure of the P-3 tube resulting in the loss of engine power.

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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