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NTSB Report
March 2, 1991 · British Aerospace BAE-146-200 BAE-146-20 · CGRNU
Jacksonville, FL
Overview
Report Status
Probable Cause
Event Type
Incident
Date
March 2, 1991
Injury Outcomes
No injuries (5 uninjured)
Location
Jacksonville, FL
Aircraft
British Aerospace BAE-146-200 BAE-146-20
Tail Number
CGRNU
Operator
Air Nova
Injuries
None
Aircraft Damage
Minor
NTSB Number
MIA91IA091
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.
NTSB Probable Cause
INADEQUATE ENGINE PERFORMANCE IN THE DESIGNED AIRPLANE FLIGHT ENVELOPES.
Full 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.
Flight
Event TypeIncident
Event Time14:45 EST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBritish Aerospace BAE-146-200 BAE-146-20
Tail NumberCGRNU
Aircraft CategoryAir
DamageMinor
OperatorAir Nova
Operating RulePart 129
Engines4
Engine TypeTurbofan
Engine DetailsLycoming · ALF-502-R · Turbofan
Seats74
People & Injuries
Injury SummaryNo injuries (5 uninjured)
Fatal0
Serious0
Minor0
Uninjured5
Total5
Crew 1Age 30 · Unknown
Conditions
ConditionsIMC
LightDaylight
Wind130° @ 4 kt
Visibility2 sm
CeilingOvercast 3000 ft
Temperature / Dew Point57 / 57
Altimeter29.00 inHg
Observation Time19:50
Weather SourceWFAC