# NTSB CHI91LA182: Cessna 310L, N3337X, Fort Wayne, IN, June 6, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 6, 1991, 17:52 local (22:52 UTC)
- Place: Fort Wayne, IN
- Coordinates: 40.999149, -85.209106 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.9991&lon=-85.2091&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report March 31, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 15087
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI91LA182
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/15087/pdf
- Page: https://openairdocs.org/ntsb/CHI91LA182

## Probable cause

THE IMPROPER INSTALLATION OF A BEARING BY MAINTENANCE PERSONNEL.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Airframe/component/system failure/malfunction, approach - vfr pattern - downwind
  - landing gear,main gear strut - disengaged
  - maintenance,installation - improper, company maintenance personnel (cause)
  - landing gear,main gear strut - jammed
  - gear extension - not possible
- Gear not extended, landing

## Analysis

THE RIGHT MAIN REMAINED RETRACTED WHEN THE GEAR WERE SELECTED DOWN, AND THE PILOT LANDED ON TWO WHEELS.  EXAMINATION OF THE HUNG GEAR SHOWED AN EXTERNAL LOCK RING ON THE STRUT PISTON ASSEMBLY HAD UNSEATED, ALLOWING THE STRUT TO OVEREXTEND AND JAM IN ITS WELL.  THE INNER BEARING WHICH MOUNTS NEXT TO THE LOCK RING GROOVE WAS INSTALLED BACKWARDS. THE OPPOSITE LANDING GEAR HAD THE SAME INVERSE INSTALLATION.  BOTH INNER BEARINGS WERE NEW PARTS INSTALLED DURING ACCOMPLISHMENT OF AN AIRWORTHINESS DIRECTIVE 5 DAYS BEFORE THE ACCIDENT.  THE MANUFACTURER'S SERVICE MANUAL PROVIDES INSTRUCTIONS FOR THE CORRECT ORIENTATION OF THE INNER BEARINGS.

## Aircraft

- Registration: [N3337X](https://openairdocs.org/deregistered/N3337X-2018-03-23), registration cancelled 2018-03-23, S/N 310L-0187, built 1967 (OpenAirDocs)
- Reported make and model: CESSNA 310L
- Registry model: [Cessna 310L](https://openairdocs.org/model/cessna-310l) (registry code 2074230) (OpenAirDocs)
- Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 310L0187
- Engines: CONTINENTAL IO-470-V 260 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Edward C. Hartung
- Registered owner: Edward C. Hartung
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, June 1, 1991, 6 hours before
- Departed: 28J, PALATKA, FL
- Flight plan: IFR
- Airport: FWA, Fort Wayne Muni, runway 5, 12,000 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 42; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 1,696 total, 25 in this make and model, 1,400 as pilot in command, 30 in the last 90 days, 10 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 70° at 6 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 77 °F, dew point 45 °F
- Altimeter: 30.00 inHg
- Observed at: FWA, 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 (OpenAirDocs).

- [Accident 19910606020439A](https://openairdocs.org/incident/19910606020439A), Jun 6, 1991: Cessna 310L, Fort Wayne, IN, Substantial damage. Landed with right main gear stuck in wheel well. Gear had overextended due to piston seal put in wrong on annual.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.