- Date
- December 5, 1991, 16:45 local (23:45 UTC)
- Place
- Broomfield, CO
- Injuries
- 2 uninjured
- Damage
- Minor damage
- Phase of flight
- Approach
- Aircraft
- N9320DCessna 172RG
- Weather
- Visual (VMC) · Day
- Status
- Completed · report May 5, 1993
- Report
- Approved by Office Director
- FAA report
- 19911205058509I
- Case key
- 18167
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
The NTSB’s determination of the probable cause, and any contributing factors.
Failure of the left main landing gear pivot assembly due to ductile torsional overstress.
Analysis
Upon return from a local area instructional flight, the left main landing gear failed to extend. After repeated unsuccessful attempts to extend and lock the left main landing gear, the pilot made an intentional wheels up landing. Post incident examination disclosed the landing gear pivot assembly failed in ductile torsional overstress. There was no evidence of fatigue or preexisting cracks.
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.
Aircraft
- Registration
- N9320D
- Reported as
- Cessna 172RG
- Category
- Airplane
- Serial number
- 172RG1119
- Airframe hours
- 4,458
- Engine
- Lycoming O-360-F1A6, 180 horsepower, reciprocating
- Damage
- Minor damage
- Flight
- Instructional · Part 91
- Operator
- Airwest Flying Club
- Registered owner
- Keigth A. Franz
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · October 4, 1991 · 76 hours before
- Airport
- BJC · Jefferson County, runway 29, 9,000 × 100 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
- 29
- Certificates
- Commercial, Flight instructor
- Airplane ratings
- Multi-engine land, Single-engine land
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Right
- Flight hours
- 510 total · 85 in this make and model · 430 as pilot in command · 52 in the last 90 days · 24 in the last 30 days · 2 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 300° at 8 knots
- Visibility
- 20 statute miles
- Lowest ceiling
- None
- Temperature
- 41 °F, dew point 25 °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 N9320D · 1
Matched to the same aircraft by N-number and date.