On January 25, 1984, a Cessna 210D (registration N45AM) was involved in an aviation accident near Englewood, CO. Investigators recorded the probable cause as: Failure of the secondary relief valve in the hydraulic power pack, which prevented a build-up of pressure in the hydraulic system. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An aircraft landed with its main gear retracted after attempts to extend them failed. Post-accident examination revealed a failed secondary relief valve in the hydraulic power pack, which had been overhauled 57 flight hours earlier.
Incident Overview
An aircraft experienced a landing with its main landing gear retracted after multiple attempts to extend the gear were unsuccessful. Following touchdown, the aircraft departed the right side of the runway.
Post-Accident Findings
A post-accident examination identified a failure of the secondary relief valve within the hydraulic power pack. This failure prevented the hydraulic system from building up sufficient pressure, which likely interfered with the normal extension of the main landing gear.
Maintenance History
The hydraulic power pack had been overhauled in July 1983. At the time of the incident, the aircraft had accumulated only 57 flight hours since that overhaul.
Probable cause
Failure of the secondary relief valve in the hydraulic power pack, which prevented a build-up of pressure in the hydraulic system.
Frequently asked questions
What happened in the 25 Jan 1984 Cessna 210D accident near Englewood, CO?
An aircraft landed with its main gear retracted after attempts to extend them failed. Post-accident examination revealed a failed secondary relief valve in the hydraulic power pack, which had been overhauled 57 flight hours earlier.
What aircraft was involved and where did it happen?
The accident on 25 Jan 1984 involved a Cessna 210D, registration N45AM, at Englewood, CO.
What was the probable cause of the accident?
Failure of the secondary relief valve in the hydraulic power pack, which prevented a build-up of pressure in the hydraulic system.
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