# NTSB ANC03LA053: Cessna 320, N5712X, McCarthy, AK, May 30, 2003 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: May 29, 2003, 19:00 local (May 30, 2003, 03:00 UTC) - Place: McCarthy, AK - Coordinates: 55.919918, -159.489685 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=55.9199&lon=-159.4897&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report September 29, 2004 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - Parties: FAA-AL-ANC FSDO 03 - NTSB case key (mKey): 57086 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC03LA053 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/57086/pdf - Page: https://openairdocs.org/ntsb/ANC03LA053 ## Probable cause The collapse of the left main landing gear during the landing roll for undetermined reasons. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Main gear collapsed, landing - roll - landing gear,main gear - collapsed (cause) ## Analysis The private certificated pilot, holder of an aviation mechanic certificate, was landing at a remote airport on a cross-country business flight. He said that during the landing roll, the left main landing gear suddenly collapsed. The pilot indicated that the airplane is equipped with one landing gear position light. He said prior to landing, he observed the right main landing gear and the nose gear position via a mirror positioned on the right engine nacelle. They appeared to be extended, and the landing gear position light was indicating green. The airplane received damage to the left flap, and the underside of the fuselage. The pilot indicated the landing gear drive mechanism consists of an actuator rod, driven by an electric motor. He noted that the main landing gear had been subjected to side loads during the flight just prior to accident flight, and either the left main landing gear actuator rod, or associated support structure, may have been damaged. As of July 2004, he had not had an opportunity to thoroughly inspect the landing gear system to determine why the landing gear collapsed. ## Factual narrative On May 29, 2003, about 1900 Alaska daylight time, a Cessna 320 airplane, N5712X, sustained substantial damage when the left main landing gear collapsed during the landing roll at the McCarthy Nr2 Airport, McCarthy, Alaska. The airplane was being operated as a visual flight rules (VFR) cross-country business flight under Title 14, CFR Part 91, when the accident occurred. The airplane was operated by Wards Aero Service, Anchorage, Alaska. The private certificated pilot, the sole occupant, was not injured. Visual meteorological conditions prevailed. The flight originated at Merrill Field, Anchorage, about 1750. No flight plan was filed, nor was one required. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on May 30, the pilot reported that he was flying to McCarthy as part of his aircraft maintenance business. He said he landed on runway 01, and during the landing roll, the left main gear suddenly collapsed. The airplane received structural damage to the underside of the fuselage. The pilot indicated that the airplane is equipped with one landing gear position light. He said prior to landing, he observed the right main landing gear and the nose gear position via a mirror positioned on the right engine nacelle, and they appeared to be extended. The landing gear position light was green. The pilot noted the landing gear drive mechanism consists of an actuator rod, driven by an electric motor. In another telephone conversation with an NTSB investigator on July 27, 2004, the pilot said that the airplane's landing gear had been subjected to side loading during the flight just prior to the accident flight, and he suspected the left main actuator rod, or supporting structure, may have been damaged. At the time of this report, the pilot, an aviation mechanic, had not had an opportunity to exam the landing gear mechanism to see if he could determine why the landing gear collapsed. ## Aircraft - Registration: [N5712X](https://openairdocs.org/deregistered/N5712X-2018-04-16), registration cancelled 2018-04-16, S/N 320-0012, built 1961 (OpenAirDocs) - Reported make and model: Cessna 320 - Registry model: [Cessna 320](https://openairdocs.org/model/cessna-320) (registry code 2074502) (OpenAirDocs) - Registry engine: [Continental TSI0-470-B](https://openairdocs.org/engine/continental-tsi0-470-b) (registry code 17029, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 0012 - Airframe hours: 3173 - Engines: CONTINENTAL TSIO-470B 260 horsepower reciprocating - Damage: Substantial damage - Flight: Business, Part 91 - Operator: Kenneth W. Simonis - Registered owner: Laura Sinnott - Airworthiness certificate: Standard, Normal - Last inspection: Annual, April 24, 2003, 30 hours before - Departed: PAMR, Anchorage, AK - Destination: 15Z, McCarthy, AK - Airport: 15Z, McCARTHY, runway 01, 3,500 × 60 ft, dirt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 55; injuries: none; private; airplane ratings: single-engine land, single-engine sea; medical: class 3, valid medical--w/ waivers/lim; last flight review November 11, 2002; seat: left; flight hours: 3,200 total, 450 in this make and model ## Weather - Conditions: Visual (VMC), Day - Visibility: 50 statute miles - Lowest ceiling: none - Temperature: 61 °F ## 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 20030529012309A](https://openairdocs.org/incident/20030529012309A), May 29, 2003: Cessna 320, Mccarthy, AK, Substantial damage. (-23) According to the pilot, after landing the left main landing gear collapsed. 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.