- Date
- April 2, 1991, 16:00 local (21:00 UTC)
- Place
- West Chicago, IL
- Injuries
- 2 uninjured
- Damage
- Minor damage
- Phase of flight
- Maneuvering
- Aircraft
- N9592BCessna 172RG
- Weather
- Visual (VMC) · Day
- Status
- Completed · report May 28, 1993
- Report
- Approved by Office Director
- Safety recommendations
- Yes
- FAA report
- 19910402015659I
- Case key
- 14928
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
Failure of the splined shaft on the right main landing gear pivot assembly. A factor related to the incident was inadequate design of the landing gear pivot assembly.
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
After repeated attempts to lower the landing gear, only the left main and nose gear would extend. The pilots elected to make a wheels-up landing. During the landing, the lower fuselage and propeller tips received minor damage. An investigation revealed the right main landing gear pivot assembly (pn 2441100-1) had failed. A metallurgical examination disclosed the splined shaft on the pivot assembly had fractured in torsional overload. As a result, mechanical extension of the right main landing gear was not possible.
Aircraft
- Registration
- N9592B
- Reported as
- Cessna 172RG
- Category
- Airplane
- Serial number
- 172RG0905
- Airframe hours
- 4,567
- Engine
- Lycoming O-360-F1A6, 180 horsepower, reciprocating
- Damage
- Minor damage
- Flight
- Instructional · Part 91
- Operator
- Av. Training Enterprise Of Il.
- Registered owner
- Av. Training Enterprise Of Il.
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · March 20, 1991 · 45 hours before
- Airport
- DPA · Dupage, runway 15, 3,400 × 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
- 25
- Certificates
- Flight instructor, Commercial
- Airplane ratings
- Single-engine land, Single-engine sea
- Instrument ratings
- Airplane
- Medical
- Class 1, Valid Medical--no waivers/lim.
- Seat
- Right
- Flight hours
- 1,531 total · 280 in this make and model · 1,430 as pilot in command · 25 in the last 90 days · 15 in the last 30 days · 2 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 140° at 10 knots
- Visibility
- 15 statute miles
- Lowest ceiling
- None
- Temperature
- 54 °F, dew point 45 °F
- Altimeter
- 30.00 inHg
- Observed at
- DPA, 1 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.