# NTSB WPR10LA216: Cessna 210, N9527T, Show Low, AZ, April 11, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: April 10, 2010, 17:05 local (Apr 11, 2010, 00:05 UTC) - Place: Show Low, AZ - Coordinates: 34.265556, -110.005554 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=34.2656&lon=-110.0056&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing: Landing gear not configured](https://openairdocs.org/ntsb-events/095) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report June 27, 2011 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 75849 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR10LA216 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/75849/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=75849 - Page: https://openairdocs.org/ntsb/WPR10LA216 ## Probable cause Inadequate clearance between a landing gear brake system line and airframe components, which precluded gear extension and resulted in an intentional gear-up landing. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Landing gear system: gear extension and retract sys](https://openairdocs.org/ntsb-findings/01023230): Aircraft › Aircraft systems · Inoperative (probable cause); cases with it: [Cessna 210, 6 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md?model=2073402), [All aircraft, 416 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Prior to flight: Miscellaneous/other](https://openairdocs.org/ntsb-events/900); cases with it: [Cessna 210, 1 case](https://openairdocs.org/ntsb-events/900/sequence.md?model=2073402), [All aircraft, 1,556 cases](https://openairdocs.org/ntsb-events/900/sequence.md) - [Approach-VFR pattern final: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330); cases with it: [Cessna 210, 6 cases](https://openairdocs.org/ntsb-events/330/sequence.md?model=2073402), [All aircraft, 994 cases](https://openairdocs.org/ntsb-events/330/sequence.md) - [Landing: Landing gear not configured](https://openairdocs.org/ntsb-events/095) (defining event); cases with it: [Cessna 210, 3 cases](https://openairdocs.org/ntsb-events/095/sequence.md?model=2073402), [All aircraft, 584 cases](https://openairdocs.org/ntsb-events/095/sequence.md) ## Analysis The pilot took off following maintenance on the airplane, which did not involve the left main landing gear. The pilot planned to remain in the local traffic pattern. When the pilot attempted to extend the landing gear for landing, the left main gear remained retracted in the wheel well. The pilot reported that, although he followed the specified emergency gear extension procedure, the left main landing gear did not extend, so he landed with the gear up. The landing caused abrasion to the airframe belly skin and damage to the forward bulkhead as the airplane slid to a stop on the runway. An examination of the airplane revealed that the left main landing gear's brake line was mispositioned and had been caught on the gear leg's snubber in the wheel well. This interference between the brake line and the snubber precluded the gear from extending. The investigation did not determine the reason for the brake line becoming mispositioned in such a manner that its clearance from the snubber was inadequate. ## Factual narrative On April 10, 2010, about 1705 mountain standard time, a Cessna 210, N9527T, registered to Overseas Aircraft Support, Inc., Lakeside, Arizona, landed at the Show Low Regional Airport, Show Low, Arizona, with its landing gear intentionally retracted. The airplane was substantially damaged as it slid to a stop on the runway. Visual meteorological conditions prevailed at the time of the personal flight. No flight plan had been filed. Neither the private pilot nor passenger was injured. The flight was performed under the provisions of 14 Code of Federal Regulations Part 91, and it originated from Show Low about 1530. The pilot reported that, earlier during the day, maintenance had been performed to the airplane, which was manufactured in 1960. The maintenance did not involve the left main landing gear. According to the pilot, the accident occurred during the airplane's first flight following completion of maintenance to the nose wheel's shimmy dampner. The pilot stated that he planned to fly the airplane around the airport's traffic pattern to functionally check the maintenance. The pilot further reported that, during taxi and climb, no problems were noted with the airplane. However, when he attempted to extend the landing gear, the left main gear did not extend. The left gear remained in the wheel well, and the gear door was open. After troubleshooting the situation and following the emergency gear extension procedure, the pilot elected to land with all the gear in the retracted position. The airplane slid to a stop on runway 24. During recovery of the airplane off the runway, a mechanic reported observing that the left gear's brake line was caught on the gear leg snubber. The mechanic disconnected the brake line from the caliper and the landing gear extended without further difficulty. Interference between the brake line and the gear leg snubber had precluded the gear from extending. The Federal Aviation Administration (FAA) coordinator subsequently reported to the National Transportation Safety Board investigator that his examination of the airplane revealed its belly skin was abraded and a forward bulkhead, near the front door post area, was damaged. Repair to this bulkhead would require a major airframe structural repair. The FAA coordinator also reported that the left main landing gear's brake line was improperly positioned on the airplane. In the location where it was found on the accident flight, the line had inadequate clearance from the snubber and became hooked on it. This restricted the gear's movement out of the gear well. The FAA coordinator was unable to ascertain the underlying reason for the brake line not being properly attached to the gear leg in a manner that would provide adequate clearance from other objects. ## Aircraft - Registration: [N9527T](https://openairdocs.org/aircraft/N9527T), registered now, S/N 57327, built 1960 (OpenAirDocs) - Reported make and model: CESSNA 210 - Registry model: [Cessna 210](https://openairdocs.org/model/cessna-210) (registry code 2073402) (OpenAirDocs) - Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 57327 - Airframe hours: 3048 - Engines: CONT MOTOR IO-470-E 260 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 10, 2009, 41 hours before - Departed: SOW, Show Low, AZ - Destination: SOW, Show Low, AZ - Airport: SOW, Show Low Regional, runway 24, 7,200 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 31; injuries: none; private; airplane ratings: single-engine land; medical: class 3, without waivers/limitations; last flight review December 29, 2008; seat: left; flight hours: 301 total, 24 in this make and model, 301 as pilot in command, 24 in the last 90 days, 2 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 230° at 17 knots, gusting 26 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 64 °F, dew point 12 °F - Altimeter: 30.13 inHg - Observed at: SOW ## 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 20100410032459A](https://openairdocs.org/incident/20100410032459A), Apr 10, 2010: Cessna 210, Show Low, AZ, Substantial damage. Left main gear would not extend out of the wheel well. Nose and right main gear extended down and locked normal. Pilot made decision to land aircraft with all… ## Docket (2 files) The files NTSB released with the investigation on April 21, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=75849. 609 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 475 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40346302&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Statement of Mechanic (item 2, .PDF, 134 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40346303&FileExtension=.PDF&FileName=Statement%20of%20Mechanic-Redacted.PDF 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.