# NTSB LAX07LA136: Cessna T210N, N81PC, Oakland, CA, April 1, 2007 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: April 1, 2007, 15:00 local (22:00 UTC) - Place: Oakland, CA - Coordinates: 37.7244444444444, -122.223333333333 - Nearby events: https://openairdocs.org/map.md?lat=37.7244&lon=-122.2233&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report March 31, 2008 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 65650 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX07LA136 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/65650/pdf - Page: https://openairdocs.org/ntsb/LAX07LA136 ## Probable cause Collapse of the landing gear for undetermined reasons. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Nose gear collapsed, takeoff - roll/run - reason for occurrence undetermined (cause) ## Analysis While attempting to start the airplane 2 days after an annual inspection, the landing gear warning horn sounded upon activation of the master switch. The pilot checked the landing gear and found it in the down and locked position with the squat switches depressed. He also noted that with both of the avionics master switches in the ON position, the landing gear warning horn stopped, the instrument panel lights activated, and the landing gear down and locked green light illuminated. He made the return flight home and the following day flew the airplane, with the landing gear in the extended position, to an avionics shop. During the inspection, a shorted terminal in the breaker box was found and repaired. During a return flight to the pilot's home base the landing gear system functioned normally. Five days later, the pilot attempted to start the engine. He realized the battery was dead and got a jump start. The avionics then failed during the takeoff initial climb. He recycled the avionics master, but power to the avionics was not returned. The pilot returned and landed without problems. The battery was removed, recharged, and then replaced. The pilot noted that everything functioned properly and he decided to continue his flight. During the takeoff roll, the nose landing gear collapsed and the airplane slid down the runway, with the left main landing gear eventually collapsing. During an inspection of the aircraft, an FAA inspector noted structural damage to the airframe. Maintenance personnel inspected the landing gear and electrical system and found no discrepancies. They replaced a weak battery and cycled the landing gear several times. They were not able to reproduce the discrepancy encountered by the pilot during the accident takeoff roll. ## Factual narrative On April 1, 2007, about 1500 Pacific daylight time, a Cessna T210N, N81PC, experienced a collapsed nose landing gear during the takeoff roll from runway 33 at Metropolitan Oakland International Airport (OAK), Oakland, California. The pilot/owner operated the airplane under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. The airplane sustained substantial damage after one of the wings struck the runway. The pilot and one passenger were not injured. Day visual meteorological conditions prevailed for the flight that was originating at the time of the accident on a local area flight; no flight plan had been filed. In the pilot's written report, he stated that on March 22, 2007, an annual inspection had been completed. He flew the airplane to Bryce Canyon, Utah, the following day. Two days later he attempted to start the airplane for the return flight to OAK. Upon activation of the master switch, the gear horn sounded. He stated that a gear check revealed that the landing gear was "down and locked, squat switches depressed." He checked the circuit breakers and radio switches with the master switch ON, and found that having both avionics master switches in the ON position stopped the gear horn audio and activated "all instruments as well as [the] down and locked green light." The pilot made the return flight to OAK. On March 26, 2007, he flew the airplane to Sacramento, with the landing gear in the down position. Airborne Electronic found a shorted terminal in the breaker box, repaired it, and returned it to service. The pilot stated that the return flight to OAK was normal, and the landing gear functioned properly. On the day of the accident, the pilot attempted to start the engine, however, the battery was dead, and he had to get a jump start. After he started the engine, he departed runway 33. On the takeoff climb out the electronics failed and recycling the master did not return power. He returned to land without any problems. He removed the battery and took it to Pacific States Aviation to have it recharged. About 4 hours later, he reinstalled the battery and noted no additional problems. The pilot stated that he taxied out, conducted the pre-takeoff checklist and was on the takeoff roll from runway 33 when the nose landing gear and eventually the left main landing gear retracted. He reduced the throttle, and the airplane slid about 300 feet down the runway. The incident was upgraded to an accident on April 24, 2007, after a Federal Aviation Administration (FAA) airworthiness inspector examined the airplane and found structural damage to the airframe. According to maintenance personnel from Beegles Aircraft Service, Inc., Greeley, Colorado, a thorough check of the landing gear and electrical system were conducted, with no discrepancies found. They noted a weak battery, replaced it, and then cycled the landing gear several times. They were not able to reproduce the discrepancy that the pilot had encountered on the accident takeoff roll. ## Aircraft - Registration: [N81PC](https://openairdocs.org/deregistered/N81PC-2010-04-09), registration cancelled 2010-04-09, S/N 21063620, built 1979 (OpenAirDocs) - Reported make and model: Cessna T210N - Registry model: [Cessna T210N](https://openairdocs.org/model/cessna-t210n) (registry code 2073456) (OpenAirDocs) - Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 21063620 - Airframe hours: 2531 - Engines: Continental TSIO-520-R 310 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: John H. Austin - Airworthiness certificate: Standard, Normal - Last inspection: Annual, March 1, 2007, 5 hours before - Departed: OAK, Oakland, CA - Destination: OAK - Airport: OAK, Metropolitan Oakland Intl, runway 33, 3,372 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 62; injuries: none; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, with waivers/limitations; last flight review January 1, 2007; seat: left; flight hours: 6,500 total, 5,000 in this make and model, 6,400 as pilot in command, 20 in the last 90 days, 5 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 260° at 11 knots - Visibility: 10 statute miles - Lowest ceiling: 25,000 ft broken - Temperature: 59 °F, dew point 46 °F - Altimeter: 30.00 inHg - Observed at: OAK ## 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 20070401013419A](https://openairdocs.org/incident/20070401013419A), Apr 1, 2007: Cessna T210N, Oakland, CA, Substantial damage. (-23) The pilot attempted a take-off from Oakland airport at 1630 PDT on 04/01/2007. Pilot reported that the nose landing gear collapsed during take-0FF. The… 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.