- Date
- July 22, 1991, 09:05 local (14:05 UTC)
- Place
- Greenbay, WI
- Injuries
- 8 uninjured
- Damage
- Minor damage
- Phase of flight
- Enroute
- Aircraft
- N770MBeech B200
- Weather
- Visual (VMC) · Day
- Status
- Completed · report January 27, 1993
- Report
- Approved by Office Director
- FAA report
- 19910722035799I
- Case key
- 14931
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the incident.
On this page
Probable cause
Inadequate airframe design, which resulted in the in-flight separation of the left engine's outboard aft upper cowl door.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
The twin-engine turbo prop airplane was cruising at 8000' MSL, when the left engine's outboard aft upper accessory case cowl door separted from its mount. The cowl door struck the top surface of the left wing (outboard of the engine nacelle) & penetrated the wing's fuel cell. This resulted in fuel siphoning & prompted the pilot to perform a precautionary engine shutdown. The airplane was landed without further incident. Airworthiness directive (AD) 91-18-11 (effective 9/3/91) required structural modification of the aft upper cowl assembly doors to prevent inflight separation.
Aircraft
- Registration
- N770M
- Reported as
- Beech B200
- Category
- Airplane
- Serial number
- BB1330
- Engine
- P&W PT6A-42, 840 horsepower, turbo prop
- Damage
- Minor damage
- Flight
- Business · Part 91
- Registered owner
- Marshall & Isley Bank
- Departed
- MKE · Milwaukee, WI
- Destination
- GRB · Greenbay, WI
- Flight plan
- IFR
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 52
- Certificates
- Airline transport, Flight instructor
- Airplane ratings
- Single-engine land, Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--w/ waivers/lim
- Flight hours
- 6,800 total · 1,800 in this make and model
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 240° at 7 knots
- Visibility
- 3 statute miles
- Lowest ceiling
- 8,000 ft broken
- Temperature
- -0 °F, dew point -0 °F
- Observed at
- GRB, 35 nm away
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.