# NTSB DEN84LA074: Cessna 210D, N45AM, Englewood, CO, January 25, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: January 24, 1984, 18:40 local (Jan 25, 1984, 01:40 UTC)
- Place: Englewood, CO
- Coordinates: 39.580448, -104.860466 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.5804&lon=-104.8605&mi=10
- Phase of flight: [Other](https://openairdocs.org/ntsb-phases/800) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16324
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN84LA074
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16324/pdf
- Page: https://openairdocs.org/ntsb/DEN84LA074

## Sequence of events

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

- Airframe/component/system failure/malfunction, other
  - hydraulic system,relief valve - failure,total (cause)
  - landing gear,normal retraction/extension assembly - inoperative
  - gear extension - not possible
- In flight collision with terrain/water, landing - flare/touchdown
  - wheels up landing - performed, pilot in command

## Analysis

THE ACFT WAS LANDED WITH THE MAIN GEAR RETRACTED AFTER ATTEMPTS TO EXTEND THEM FAILED. AFTER LANDING THE ACFT DEPARTED THE RIGHT SIDE OF THE RWY. POST ACCIDENT EXAMINATION REVEALED THAT THE SECONDARY RELIEF VALVE HAD FAILED IN THE HYDRAULIC POWER PACK. THIS PREVENTED A BUILD-UP OF PRESSURE IN THE HYDRAULIC SYSTEM. THE ACFT HAD ONLY FLOWN 57 HOURS SINCE THE HYDRAULIC POWER PACK WAS OVERHAULED IN JULY 1983.

## Aircraft

- Registration: [N45AM](https://openairdocs.org/aircraft/N45AM), registered now, S/N 21058475, built 1964 (OpenAirDocs)
- Reported make and model: CESSNA 210D
- Registry model: [Cessna 210D](https://openairdocs.org/model/cessna-210d) (registry code 2073414) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 21058475
- Airframe hours: 3214
- Engines: CONTINENTAL IO-520-A 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Business, Part 91
- Registered owner: Baptist Foundation Of Co
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, July 15, 1983
- Departed: CAG, CRAIG, CO
- Destination: APA, ENGLEWOOD, CO
- Flight plan: IFR
- Airport: APA, Arapahoe Co., runway 34L, 5,140 × 77 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 51; flight instructor, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 7,500 total, 350 in this make and model, 7,500 as pilot in command, 28 in the last 90 days, 4 in the last 30 days

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 280° at 4 knots
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 36 °F, dew point -0 °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 (OpenAirDocs).

- [Accident 19840124022869A](https://openairdocs.org/incident/19840124022869A), Jan 24, 1984: Cessna 210D, Englewood, CO, Substantial damage. Main gear would not lower due to hydrulic power pack failure. 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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