# NTSB ATL85LA184: Cessna T337G, N30S, Knoxville, TN, June 12, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 12, 1985, 16:50 local (20:50 UTC)
- Place: Knoxville, TN
- Location: 35.8111° N, 83.9941° W: Placed by OpenAirDocs at MC GHEE TYSON (TYS), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=35.8111&lon=-83.9941&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 6807
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ATL85LA184
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/6807/pdf
- Page: https://openairdocs.org/ntsb/ATL85LA184

## Sequence of events

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

- Airframe/component/system failure/malfunction, approach
  - landing gear - inoperative (cause)
  - hydraulic system,bypass valve - inoperative (cause)
  - electrical system,electric switch - jammed (cause)
  - maintenance,service bulletin/letter - not performed, other maintenance personnel (cause)
- In flight collision with terrain/water, landing
  - landing gear,normal retraction/extension assembly - disabled
  - landing gear,emergency extension assembly - disabled

## Analysis

THE ACFT MADE AN EMERGENCY GEAR UP LANDING WHEN BOTH THE NORMAL AND EMERGENCY EXTENSION SYSTEMS FAILED TO FUNCTION PROPERLY. A MECHANIC WAS LATER ABLE TO EXTEND THE GEAR WITH THE ACFT ON JACKS BY REPEATEDLY CYCLING THE SELECTOR SWITCH.IT WAS DETERMINED THAT THE SOLENOID ON THE LANDING GEAR HYDRAULIC MANIFOLD ASSEMBLY HAD MALFUNCTIONED, LEAVING THE SELECTOR VALVE ASSEMBLY STUCK IN THE UP POSITION. CESSNA SERVICE LETTER SE76-24 RECOMMENDS REPLACEMENT OF THE SOLENOID WITH AN IMPROVED VERSION. ACCORDING TO THE MECHANIC, THIS HAD NOT BEEN ACCOMPLISHED PRIOR TO THE ACCIDENT.

## Aircraft

- Registration: [N30S](https://openairdocs.org/aircraft/N30S), registered now, S/N P3370147, built 1973 (OpenAirDocs)
- Reported make and model: CESSNA T337G
- Registry model: [Cessna T337G](https://openairdocs.org/model/cessna-t337g) (registry code 2075726) (OpenAirDocs)
- Registry engine: [Continental IO-360 series](https://openairdocs.org/engine/continental-io-360-series) (registry code 17025, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: P3370147
- Airframe hours: 509
- Engines: CONTINENTAL IO-360-C 225 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Tarr Chevrolet Co.
- Registered owner: Southaire, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, August 7, 1984, 30 hours before
- Departed: SSI, SEA ISLAND, GA
- Destination: MOR, MORRISTOWN, TN
- Airport: TYS, Mcghee Tyson, runway 23L, 5,999 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 65; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: unknown, valid medical--w/ waivers/lim; seat: left; flight hours: 12,000 total

## Weather

- Conditions: Visual (VMC), Day
- Wind: 250° at 11 knots
- Visibility: 15 statute miles
- Lowest ceiling: 3,500 ft broken
- Temperature: 68 °F, dew point 52 °F
- Altimeter: 29.00 inHg
- Observed at: TYS

## 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 19850612024389A](https://openairdocs.org/incident/19850612024389A), Jun 12, 1985: Cessna T337G, Knoxville, TN, Substantial damage. Gear could not be extended. Original actuating solenoid in power pack defective. Service letter not complied with.

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.

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