# NTSB LAX06LA166: McKenzie Lancair IV-P Turbine, N5M, San Diego, CA, May 8, 2006 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: May 8, 2006, 12:30 local (19:30 UTC) - Place: San Diego, CA - Coordinates: 32.815555, -117.14389 - Nearby events: https://openairdocs.org/map.md?lat=32.8156&lon=-117.1439&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report July 25, 2007 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 63654 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX06LA166 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/63654/pdf - Page: https://openairdocs.org/ntsb/LAX06LA166 ## Probable cause The collapse of the left main gear for undetermined reasons. A factor was the pilot's inadequate remedial action in response to the left main gear not locked warning light by not attempting to manually extend the gear to ensure it was fully down and locked. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Gear collapsed, landing - flare/touchdown - landing gear,main gear - collapsed (cause) - remedial action - inadequate, pilot in command (contributing factor) - gear down and locked - not attained, pilot in command (contributing factor) ## Analysis The airplane veered off the runway after the left main gear collapsed on landing. The pilot was cleared to land on runway 28L. He lowered the landing gear in preparation for landing, and received an indication of three green lights confirming that the gear was down and locked. At this point, an electrical power failure occurred, and he initiated a go-around. He turned the emergency battery on, and this restored power to the radio and several critical systems. The gear lights indicated that only the nose and right main were now down and locked. He asked the tower controller to confirm the gear position. The tower said it appeared to be down, and cleared the pilot to land on runway 28R. Upon touchdown, the left main gear collapsed. The pilot stated that he should have tried to pump the gear in an attempt to get it in the locked position. No determination was made regarding the reason for the collapse of the left main landing gear. ## Factual narrative On May 8, 2006, about 1230 Pacific daylight time, a McKenzie Lancair experimental IV-P Turbine, N5M, veered off the runway after the left main gear collapsed on landing at Montgomery Field, San Diego, California. The pilot/owner was operating the airplane under the provisions of 14 CFR Part 91. The private pilot was not injured; the airplane sustained substantial damage. The cross-country personal flight departed Phoenix Deer Valley, Phoenix, Arizona, about 1130, with a planned destination of Montgomery Field. Visual meteorological conditions prevailed, and no flight plan had been filed. The pilot submitted a written report. He was cleared to land on runway 28L at Montgomery Field. He lowered the landing gear in preparation for landing, and received an indication of three green lights confirming that the gear was down and locked. At this point, an electrical power failure occurred, and he initiated a go-around. He turned the emergency battery on, and this restored power to the radio. The gear lights indicated that only two were down and locked. He asked the tower controller to confirm the gear position. The tower said it appeared to be down, and cleared the pilot to land on runway 28R. Upon touchdown the left main gear collapsed. The pilot stated that he should have tried to pump the gear in an attempt to get it in the locked position. ## Aircraft - Registration: [N5M](https://openairdocs.org/deregistered/N5M-2025-03-27), registration cancelled 2025-03-27, S/N LIV-490 (OpenAirDocs) - Reported make and model: McKenzie Lancair IV-P Turbine - Registry model: [Mckenzie Greg LANCAIR IV-P TURBINE](https://openairdocs.org/model/mckenzie-greg-lancair-iv-p-turbine) (registry code 056120N) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: LIV-490 - Airframe hours: 270 - Engines: Walter turbo prop - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: William A. Stern - Registered owner: William A. Stern - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, May 1, 2005 - Departed: KDVT, Phoenix, AZ - Destination: KMYF, San Diego, CA - Airport: KMYF, Montgomery Field, runway 28R, 4,577 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 58; injuries: none; private; airplane ratings: multi-engine land, single-engine land; medical: class 3; seat: left; flight hours: 1,700 total, 125 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 240° at 7 knots - Visibility: 7 statute miles - Lowest ceiling: none - Temperature: 68 °F, dew point 55 °F - Altimeter: 29.94 inHg - Observed at: MYF ## 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 20060508007809A](https://openairdocs.org/incident/20060508007809A), May 8, 2006: Mckenz LANCAIRIVPTU, San Diego, CA, Substantial damage. (-23) On may 8, 2006, N5M, a Lancair iv-pt homebuilt aircraft, experienced a left main landing gear collapse after landing at Montgomery field, runway 28R, San… ## Other investigations on N5M (1) 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. - [NTSB WPR13FA076](https://openairdocs.org/ntsb/WPR13FA076), Dec 29, 2012: Mckenzie Lancair IV-P Turbine (N5M), Lakeside, CA, substantial damage, 3 fatal. Probable cause: The pilot’s failure to maintain airspeed while attempting a visual climb through a broken cloud layer, which resulted in a stall/spin. 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.