# Engine bleed air system - Type: NTSB finding section - Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft power plant](https://openairdocs.org/ntsb-findings/0105) › Engine bleed air system - NTSB code: 010575 - Cases: 14 - In the probable cause: 12 - Fatal cases: 1 - All cases: https://openairdocs.org/ntsb-findings/010575/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/010575/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/010575 ## Cases per year (in the probable cause / all) - 2009: 1 / 1 - 2011: 2 / 2 - 2016: 3 / 3 - 2017: 1 / 1 - 2018: 1 / 1 - 2019: 1 / 1 - 2021: 0 / 1 - 2022: 1 / 1 - 2023: 0 / 1 - 2024: 2 / 2 ## Findings - [Engine bleed air system, general](https://openairdocs.org/ntsb-findings/01057500): 7 cases, 4 in the probable cause - [Engine anti-icing system](https://openairdocs.org/ntsb-findings/01057510): 4 cases, 4 in the probable cause - [Compressor bleed valve](https://openairdocs.org/ntsb-findings/01057532): 4 cases, 4 in the probable cause - [Compressor bleed control](https://openairdocs.org/ntsb-findings/01057530): 1 cases, 1 in the probable cause ## Defining events in these cases - [Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342): 4 cases - [Loss of engine power (total)](https://openairdocs.org/ntsb-events/341): 2 cases - [Powerplant sys/comp malf/fail](https://openairdocs.org/ntsb-events/340): 2 cases - [Fuel related](https://openairdocs.org/ntsb-events/190): 2 cases - [Fire/smoke (non-impact)](https://openairdocs.org/ntsb-events/150): 2 cases - [Birdstrike](https://openairdocs.org/ntsb-events/901): 1 cases - [Part(s) separation from AC](https://openairdocs.org/ntsb-events/338): 1 cases ## Aircraft models (registry) - [Bombardier CL-600-2C11](https://openairdocs.org/model/bombardier-cl-600-2c11): 2 cases - [Air Tractor AT-602](https://openairdocs.org/model/air-tractor-at-602): 2 cases - [Piper PA46-500TP](https://openairdocs.org/model/piper-pa46-500tp): 1 cases - [Piper PA-18-150](https://openairdocs.org/model/piper-pa-18-150): 1 cases - [Lockheed C-130A](https://openairdocs.org/model/lockheed-c-130a): 1 cases - [Cessna 172M](https://openairdocs.org/model/cessna-172m): 1 cases - [Cessna 152](https://openairdocs.org/model/cessna-152): 1 cases - [Boeing 737-8](https://openairdocs.org/model/boeing-737-8): 1 cases - [Bell OH-58A](https://openairdocs.org/model/bell-oh-58a): 1 cases - [Bell UH-1B](https://openairdocs.org/model/bell-uh-1b): 1 cases ## Other findings in the same cases - [Conducive to carburetor icing](https://openairdocs.org/ntsb-findings/03031030) (Environmental issues): 3 cases - [Use of equip/system](https://openairdocs.org/ntsb-findings/02063015) (Personnel issues): 3 cases - [Adequacy of policy/proc](https://openairdocs.org/ntsb-findings/04021015) (Organizational issues): 1 cases - [Equipment manufacture](https://openairdocs.org/ntsb-findings/04013010) (Organizational issues): 1 cases - [Manufacture/production, general](https://openairdocs.org/ntsb-findings/04013000) (Organizational issues): 1 cases - [Design of document/info](https://openairdocs.org/ntsb-findings/04011020) (Organizational issues): 1 cases - [Equipment design](https://openairdocs.org/ntsb-findings/04011010) (Organizational issues): 1 cases - [Animal(s)/bird(s)](https://openairdocs.org/ntsb-findings/03022045) (Environmental issues): 1 cases - [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 1 cases - [Installation](https://openairdocs.org/ntsb-findings/02062035) (Personnel issues): 1 cases ## Newest cases - [NTSB ERA24LA135](https://openairdocs.org/ntsb/ERA24LA135), Mar 9, 2024: Cessna 172 (N5171H), Homestead, FL, substantial damage. Probable cause: A loss of engine power due to carburetor ice as a result of the pilot’s failure to use carburetor heat in conditions conducive to the formation of carburetor ice. - [NTSB WPR24LA070](https://openairdocs.org/ntsb/WPR24LA070), Jan 10, 2024: Air Tractor AT-502A (N6126U), Stratford, CA, substantial damage. Probable cause: A partial loss of engine power due to the malfunction of the engine compressor bleed-off valve. - [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 ERA23LA066](https://openairdocs.org/ntsb/ERA23LA066), Nov 14, 2022: Piper PA-18-150 (N9858P), St. Augustine, FL, substantial damage. Probable cause: The pilot’s failure to appropriately use carburetor heat, which resulted in a total loss of engine power due to carburetor icing. - [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 CEN18FA277](https://openairdocs.org/ntsb/CEN18FA277), Jul 17, 2018: Cessna 152 (N24515), Fort Rice, ND, substantial damage, 1 fatal. Probable cause: The pilot's failure to use carburetor heat in conditions that were conducive to serious carburetor icing, which resulted in a loss of engine power, an exceedance of the airplane's critical angle of… - [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 WPR17LA042](https://openairdocs.org/ntsb/WPR17LA042), Dec 27, 2016: Air Tractor AT 602 (N602L), Willows, CA, substantial damage. Probable cause: The decision of the maintenance facility mechanic to conduct maintenance without reference to the applicable manufacturer’s guidance, which resulted in the improper reassembly and subsequent failure… - [NTSB WPR16LA134](https://openairdocs.org/ntsb/WPR16LA134), Jul 2, 2016: Bell OH 58A (N6251G), Brawley, CA, substantial damage. Probable cause: The engine's degraded performance due to excessive wear of the engine bleed valve, which prevented it from closing during the accident flight. Contributing to the accident was the operator's failure… 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. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.