# NTSB SEA00LA090: Cessna T210M, N761VZ, Boise, ID, May 25, 2000 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: May 25, 2000, 10:40 local (16:40 UTC) - Place: Boise, ID - Coordinates: 43.559909, -116.210113 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=43.5599&lon=-116.2101&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report May 9, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 49277 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA00LA090 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/49277/pdf - Page: https://openairdocs.org/ntsb/SEA00LA090 ## Probable cause The deterioration and subsequent leakage of a hydraulic line which resulted in the total loss of hydraulic fluid and the inability of the pilot to extend the landing gear into the locked position. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, approach - hydraulic system,line - deteriorated (cause) - hydraulic system,line - leak - Gear collapsed, landing - flare/touchdown - fluid,hydraulic - loss,total - gear extension - not possible, pilot in command ## Analysis Approaching his destination, the pilot lowered the landing gear of the Cessna T210M, and was then advised by the tower that the gear did not appear to be locked down. After a flyby confirming the right main landing gear only partially extended, the pilot attempted corrective action without success. He then returned to the airport and executed a power-off, full flaps landing to runway 28L. During the landing roll, the right gear collapsed and the right horizontal stabilizer was damaged. Post-crash examination revealed that the hydraulic hose between the system and the nose gear door actuator had deteriorated allowing a total hydraulic fluid loss and rendering the gear system inoperable. ## Factual narrative On May 25, 2000, at 1040 mountain daylight time, a Cessna T210M, N761VZ, registered to and being flown by a private pilot, sustained substantial damage when the right gear collapsed during the landing touchdown and rollout on runway 28L at the Boise Air Terminal, Boise, Idaho. The pilot was uninjured. Visual meteorological conditions existed and a VFR flight plan was in effect. The flight, which was personal, was operated under 14CFR91, and originated from Aberdeen, Idaho, at 0910, on the morning of the accident. The pilot reported in a written statement (ATTACHMENT P-I) that he departed Aberdeen, Idaho, and had an uneventful flight to Boise. After lowering the landing gear, and while on short final, the tower advised the pilot that his landing gear did not appear to be locked down. The pilot executed a go-around, recycled the landing gear and then returned for a fly-by past the tower during which one gear was confirmed visually to still be in a partially extended position. The pilot left the pattern, flew south of the airport, and attempted to correct the situation by troubleshooting and ultimately adding all the hydraulic fluid from a one-half pint container he kept in the aircraft cabin for emergencies, but this did not correct the problem. He then re-entered the pattern, executed another flyby to verify the hung gear condition and then executed a power-off, full flaps landing to runway 28L. The aircraft touched down and gradually veered off the right side of the runway coming to rest with the nose pointed east. An inspector from the Federal Aviation Administration's (FAA) Boise Flight Standards District Office (FSDO) reported that the aircraft touched down about 3,000 feet beyond the runway threshold. The right gear collapsed upon touchdown and the aircraft gradually skidded off the right side of the runway. The inspector reported that the right horizontal stabilizer had sustained damage during the ground slide. Initial examination of the landing gear system revealed a hydraulic leak. The gear were operated by means of an electrically actuated, electrically driven, hydraulic pump. The emergency extension system utilized manual pressure through the same hydraulic lines. The pilot reported in a telephone interview that he had never seen any evidence of hydraulic leakage associated with the aircraft's landing gear system. A Malfunction or Defect Report (FAA Form 8010-4) was submitted by the fixed base operator who examined the aircraft following the accident. The form reported that "the hydraulic hose failed between the system and the nose gear door actuator, resulting in system fluid depletion. The R/H [right-hand] main gear could not be extended..." and that "maintenance is unable to determine the date of manufacture of the hose (no date code)..." (refer to ATTACHMENT MDR-I). ## Aircraft - Registration: [N761VZ](https://openairdocs.org/deregistered/N761VZ-2007-05-16), registration cancelled 2007-05-16, S/N 21062565, built 1978 (OpenAirDocs) - Reported make and model: Cessna T210M - Registry model: [Cessna T210M](https://openairdocs.org/model/cessna-t210m) (registry code 2073451) (OpenAirDocs) - Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 21062565 - Airframe hours: 2173 - Engines: Continental TSIO-520 300 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Funk, Raymond F. - Airworthiness certificate: Standard, Normal - Last inspection: Annual, August 6, 1999, 29 hours before - Departed: U36, ABERDEEN, ID - Destination: BOI - Flight plan: VFR - Airport: BOI, Boise Air Terminal, runway 28L, 9,763 × 190 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 74; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 1,744 total, 950 in this make and model, 15 in the last 90 days, 10 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 280° at 7 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 64 °F, dew point 43 °F - Altimeter: 29.00 inHg - Observed at: BOI 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.