- Date
- May 18, 1991, 10:50 local (16:50 UTC)
- Place
- Boulder, CO
- Injuries
- 2 serious, 1 minor
- Damage
- Substantial damage
- Phase of flight
- Approach
- Aircraft
- N6ALBeech C23
- Weather
- Visual (VMC) · Day
- Status
- Completed · report April 8, 1993
- Report
- Approved by Office Director
- FAA report
- 19910518016499A
- Case key
- 18024
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
Inadvertent stall/mush due to the passengers's delay in relinquishing aircraft control, and inadequate supervision of the flight by the pilot in command. Factors were: mixture not leaned, and a high density altitude takeoff with a slight quartering tailwind.
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 rear seat passenger said the instructor let the front seat passenger make the takeoff and 'talked' him through the procedure. Shortly after lift off, both passengers heard a 'warning buzzer' sound that continued until ground impact. The instructor was seriously injured and could not recall any details of the accident.
Aircraft
- Registration
- N6AL
- Reported as
- Beech C23
- Category
- Airplane
- Serial number
- M-1421
- Airframe hours
- 2,756
- Engine
- Lycoming O-360-A4G, 180 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Business · Part 91
- Operator
- Dakota Ridge Aviation, Inc.
- Registered owner
- Dakota Ridge Aviation, Inc.
- Airworthiness certificate
- Standard, Normal; Standard, Utility
- Last inspection
- Annual · March 7, 1991 · 68 hours before
- Airport
- IV5 · Boulder Municipal, runway 26, 4,100 × 75 ft, asphalt
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
- 23
- Certificates
- Flight instructor, Commercial
- Airplane ratings
- Single-engine land, Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 767 total · 2 in this make and model · 682 as pilot in command · 61 in the last 90 days · 20 in the last 30 days
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 130° at 7 knots
- Visibility
- 25 statute miles
- Lowest ceiling
- 1,200 ft broken
- Temperature
- 63 °F, dew point 45 °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.