Air Nova British Aerospace BAE-146-200 BAE-146-20 incident
British Aerospace BAE-146-200 BAE-146-20 · Incident: partial loss of engine power (non-mechanical) en route
From Miami International Airport (KMIA) to LYHZ · Halifax
Event
- NTSB case
- MIA91IA091
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Incident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- 0
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- Airline
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Instrument Meteorological Cond
British Aerospace BAE-146-200 BAE-146-20
- Aircraft type
- British Aerospace BAE-146
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- CGRNU
- Operator
- Air Nova
- Onboard fatalities
- Unknown
- Route
- From Miami International Airport (KMIA), Miami, FLTo LYHZ · Halifax
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 129: Foreign
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- En route · cruise
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Partial loss of engine power (non-mechanical)
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Minor
Cause areas
- Bleed air system › Inadequate
- Manufacturer › Acft/equip, inadequate design
Approximate · Estimated position: the centre of Jacksonville, FL, the place the record names. Not the accident site.
NTSB narrative
THE FLIGHT CREW EXPERIENCED THE PARTIAL POWER LOSS OF THREE OF FOUR ENGINES WHILE IN CRUISE FLIGHT. THE AIRPLANE WAS OPERATING IN ICING CONDITIONS WITH ALL AIRPLANE ANTI ICE SYSTEMS ON. THE FLIGHT PASSED THROUGH AN AREA OF RAPIDLY WARMING AIR AND THE ENGINE BLEED BANDS WERE OPEN AND COULD NOT BE CLOSED WITH THROTTLE MOVEMENT. THE CREW SHUT DOWN TWO ENGINES TO PREVENT OVERTEMP CONDITIONS AND REDUCED ONE TO IDLE. THEY DECLARED AN EMERGENCY AND DIVERTED TO AN AIRPORT NEARBY. SUBSEQUENT TESTING OF A LIKE AIRPLANE REVEALED THAT THE ENGINE DESIGN WAS SUCH THAT WHEN OPERATING AT HIGH ALTITUDE WITH ALL ANTI ICE SYSTEMS 'ON' THE BLEED AIR VALVES COULD NOT BE CLOSED WITH NORMAL PROCEDURES. THE MANUFACTURER SUBSEQUENTLY DEVELOPED A MODIFIED CHECKLIST TO CORRECT FOR THIS SITUATION.
Probable cause
INADEQUATE ENGINE PERFORMANCE IN THE DESIGNED AIRPLANE FLIGHT ENVELOPES.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record MIA91IA091
- Event ID
- 20001212X16651
- Case number
- MIA91IA091
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: 7466095d8a7168046a334c0e36e638a070d2ac584ba5bd43ec7cbdd554531a15; retrieved 2026-09-18T18:56:33.475Z.