# NTSB MIA86LA104: Cessna 210E, N4916U, Jacksonville, FL, March 25, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 25, 1986, 16:45 local (21:45 UTC)
- Place: Jacksonville, FL
- Coordinates: 30.270839, -81.749801 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=30.2708&lon=-81.7498&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 31590
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA86LA104
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/31590/pdf
- Page: https://openairdocs.org/ntsb/MIA86LA104

## Sequence of events

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

- Airframe/component/system failure/malfunction, climb - to cruise
  - landing gear,normal retraction/extension assembly - contamination (cause)
  - maintenance,service of aircraft/equipment - improper, other maintenance personnel (cause)
- In flight collision with terrain/water, landing - flare/touchdown
  - wheels up landing - performed, pilot in command (cause)

## Analysis

AFTER DEPARTURE PLT SELECTED LANDING GEAR UP AND DID NOT RECEIVE A GEAR UP INDICATION. ANOTHER AIRCRAFT FLEW UNDER THE AIRCRAFT AND REPORTED THE NOSE GEAR AND LEFT MAIN GEAR WERE UP AND THAT THE RIGHT MAIN GEAR WAS PARTIALLY EXTENDED. WHEN ATTEMPTS TO CORRECT THIS SITUATION WERE UNSUCCESSFUL THE AIRCRAFT WAS LANDED IN THIS CONFIGUARTION. POST CRASH INSPECTION OF THE AIRCRAFT REVEALED A SECONDARY RELIEF VALVE IN THE HYDRAULIC POWER PACK WAS BEING HELD OPEN BY CONTAMINATION ALLOWING HYDRAULIC PRESSURE TO BY PASS THE LANDING GEAR ACTUATORS. THE LOGBOOK RECORDS FOR THE AIRCRAFT REVEALED NO EVIDENCE THE HYDRAULIC POWER PACK HAD EVER BEEN OVERHAULED OR THAT A MODIFICATION TO REMOVE THE SECONDARY RELIEF VALVE HAD BEEN COMPLIED WITH.

## Aircraft

- Registration: [N4916U](https://openairdocs.org/deregistered/N4916U-2014-01-16), registration cancelled 2014-01-16, S/N 21058616, built 1965 (OpenAirDocs)
- Reported make and model: CESSNA 210E
- Registry model: [Cessna 210E](https://openairdocs.org/model/cessna-210e) (registry code 2073416) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 21058616
- Airframe hours: 1726
- Engines: CONTINENTAL IO 520-A 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Charles B. Wright Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, April 6, 1985, 85 hours before
- Departed: CRG, JACKSONVILLE, FL
- Airport: 23J, Herlong, runway 11, 4,000 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 63; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 6,622 total, 82 in this make and model, 6,520 as pilot in command, 19 in the last 90 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 50° at 10 knots
- Visibility: 7 statute miles
- Lowest ceiling: 8,000 ft broken
- Temperature: 68 °F, dew point 59 °F
- Altimeter: 30.00 inHg
- Observed at: CRG, 15 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 19860325012709A](https://openairdocs.org/incident/19860325012709A), Mar 25, 1986: Cessna 210E, Jacksonville, FL, Substantial damage. Secondary relief valve held open by contamination. Normal, manual landing gear operation disabled. Landed gear up.

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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