- Date
- February 22, 1991, 15:19 local (21:19 UTC)
- Place
- Tulsa, OK
- Injuries
- 3 fatal
- Damage
- Destroyed
- Phase of flight
- Initial climb
- Aircraft
- N274MAMitsubishi MU-2B-60
- Weather
- Visual (VMC) · Day
- Status
- Completed · report January 28, 1993
- Report
- Approved by Office Director
- FAA report
- 19910222003339A
- Case key
- 23250
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
The shutdown of one engine for undetermined reasons, and the pilot's failure to maintain vmca during a critical phase of flight. A factor in the accident was the pilot's improper emergency procedure.
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
Airplane was departing on a required maintenance test flight following replacement of both engines. Witnesses stated that the takeoff roll and initial climb appeared normal, but that at about 500 ft AGL, the airplane entered a right bank which continued until the wings were vertical and the nose fell through. Airplane impacted in an inverted steep nose down attitude. Examination of wreckage revealed that the right engine had been secured and feathered. Subsequent investigation did not reveal any evidence of pre-impact failure or malfunction of either engine or any of the airframe systems. Engine mounting/rigging continuity could not be established due to impact damage. The pilot was a principal in the operator's organization and not one of the regular line pilots. Evidence indicated that the gear was up and that the left spoiler was deployed at impact. Emerg procedure taught in transition training is to use rudder trim as soon as possible after eng failure to preclude deployment of spoilers. Rudder trim found in neutral position.
Aircraft
- Registration
- N274MA
- Reported as
- Mitsubishi MU-2B-60
- Category
- Airplane
- Serial number
- 786SA
- Airframe hours
- 6,094
- Engine
- Garrett TPE-331-10, 715 horsepower, turbo prop
- Damage
- Destroyed
- Flight
- Part 91
- Operator
- Corp. Aviation Services, Inc.
- Registered owner
- Scope Leasing, Inc.
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · February 22, 1991 · 1 hours before
- Airport
- TUL · Tulsa International, runway 35L, 6,101 × 150 ft
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 58
- Certificate
- Commercial
- Airplane ratings
- Multi-engine land, Single-engine land
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--w/ waivers/lim
- Seat
- Left
- Toxicology
- Performed
- Flight hours
- 4,910 total · 445 in this make and model · 4,531 as pilot in command · 27 in the last 90 days · 11 in the last 30 days · 1 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 20° at 13 knots
- Visibility
- 15 statute miles
- Lowest ceiling
- None
- Temperature
- 61 °F, dew point 30 °F
- Altimeter
- 30.00 inHg
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N274MA · 1
Matched to the same aircraft by N-number and date.