# NTSB LAX05LA027: Cessna 172RG, N6140R, Kingman, AZ, November 1, 2004 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: October 31, 2004, 18:05 local (Nov 1, 2004, 01:05 UTC) - Place: Kingman, AZ - Coordinates: 35.259445, -113.938056 - Nearby events: https://openairdocs.org/map.md?lat=35.2594&lon=-113.9381&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report March 28, 2006 - Report: Approved by Office Director - Parties: Las Vegas, Nevada - NTSB case key (mKey): 60509 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX05LA027 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/60509/pdf - Page: https://openairdocs.org/ntsb/LAX05LA027 ## Probable cause Landing gear extension system component failure resulting in a gear up landing. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, approach - vfr pattern - final approach - landing gear,normal retraction/extension assembly - failure (cause) - landing gear,gear locking mechanism - inoperative (cause) - Wheels up landing, landing - flare/touchdown - emergency procedure - not successful, pilot in command(cfi) - wheels up landing - intentional, pilot in command(cfi) ## Analysis The airplane landed gear up following a component failure in the airplane's landing gear extension system. As the flight was approaching the airport, the gear was extended, but it failed to lock in the down position. Several attempts using both the normal and emergency extension systems failed to rectify the problem and the instructor decided to land with the gear retracted. Post accident examination revealed that the roller piston and bearing (part numbers 1281019-1 and S1997C7-8) had fallen out of their assembly, thereby allowing the actuator piston assembly to reindex itself on the main gear pivot assembly. This prevented the left main gear from achieving a locked position in the down direction. ## Factual narrative On October 31, 2004, about 1805 mountain standard time, a Cessna 172RG, N6140R, landed with retracted landing gear at the Kingman Airport, Kingman, Arizona. The touchdown was firm, and the airplane was substantially damaged as it slid to a stop on runway 35. The commercial pilot, who possessed a certified flight instructor (CFI) certificate, was providing dual flight instruction to his student, who also held a commercial pilot certificate and was in training to become a CFI. Neither of the commercial pilots was injured. The airplane was operated by Sheble Aviation, Bullhead City, Arizona, under the provisions of 14 CFR Part 91. Visual meteorological conditions prevailed, and no flight plan had been filed. The flight originated from Kingman about 1635. The CFI reported to the National Transportation Safety Board investigator that after performing a series of practice takeoffs and landings with his student at the Henderson Airport, Henderson, Nevada, he and his student experienced a mechanical malfunction with the landing gear extension system during their landing approach. The landing gear would not fully extend using either the normal or emergency extension procedures. All attempts to remedy the problem were unsuccessful, and they returned to Kingman and landed with retracted gear. Under the direction of the Safety Board investigator, the landing gear extension system was examined by an airframe and powerplant mechanic. The mechanic reported finding the roller piston and bearing (part numbers 1281019-1 and S1997C7-8) to have fallen out of their assembly, thereby allowing the actuator piston assembly to reindex itself on the main gear pivot assembly. The mechanic further indicated that this event prevented the left main gear from being locked down. The actuator assembly (part number 9882015-2) had a total time of 7,156.0 hours. ## Aircraft - Registration: [N6140R](https://openairdocs.org/deregistered/N6140R-2014-10-29), registration cancelled 2014-10-29, S/N 172RG0092, built 1979 (OpenAirDocs) - Reported make and model: Cessna 172RG - Registry model: [Cessna 172RG](https://openairdocs.org/model/cessna-172rg) (registry code 2072438) (OpenAirDocs) - Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 172RG0092 - Airframe hours: 7156 - Engines: Lycoming O-360-F1A6 180 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Sheble Aviation - Registered owner: Joseph F. Sheble, III - Airworthiness certificate: Standard, Normal - Last inspection: Annual, September 10, 2004 - Departed: HND, Henderson, AZ - Destination: IGM, Kingman, AZ - Airport: IGM, Kingman, runway 35, 6,725 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 34; injuries: none; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; last flight review January 1, 2003; seat: left; flight hours: 1,800 total, 188 in this make and model, 1,740 as pilot in command, 250 in the last 90 days, 90 in the last 30 days, 3 in the last 24 hours - Student pilot; age 56; injuries: none; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; seat: right; flight hours: 1,196 total, 13 in this make and model, 1,109 as pilot in command ## Weather - Conditions: Visual (VMC), Night - Wind: 350° at 11 knots - Visibility: 10 statute miles - Lowest ceiling: none - Altimeter: 29.94 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 20041101029279A](https://openairdocs.org/incident/20041101029279A), Nov 1, 2004: Cessna 172RG, Kingman, AZ, Substantial damage. (-23) Pilot was unable to get the left main gear to lock down for landing. After landing gear up, inspection revealed the roller piston and bearing had fell… 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.