# NTSB SEA00LA025: Dassault DA-20, N216SA, Boise, ID, November 27, 1999 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: November 27, 1999, 01:34 local (08:34 UTC) - Place: Boise, ID - Coordinates: 43.565691, -116.22189 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=43.5657&lon=-116.2219&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report May 17, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 48525 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA00LA025 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/48525/pdf - Page: https://openairdocs.org/ntsb/SEA00LA025 ## Probable cause Failure of the forward gear door lock pin. An inoperative landing gear door and inadequate maintenance inspection of the aircraft were factors. ## 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 - door,landing gear - inoperative (contributing factor) - miscellaneous,dowel/pin - failure,total (cause) - maintenance,inspection - inadequate, other maintenance personnel (contributing factor) - Dragged wing,rotor,pod,float or tail/skid, landing - roll ## Analysis After extending the gear for landing, the down-and-locked indication (green light) for the left main gear was not illuminated. The crew performed the emergency checklist procedures for abnormal gear extension with no success. The aircraft subsequently landed with the left main landing gear retracted. Inspection of the landing gear revealed that the pin (part number MY20248-001), which is part of the forward gear door lock, was corroded and cracked at the point of rotation, preventing proper movement of the gear door uplock. ## Factual narrative On November 27, 1999, about 0134 mountain standard time, a Dassault Falcon DA-20 twin turbo fan jet, N216SA, registered to RBS Aviation Group, Incorporated, and operated by Smith Air, Incorporated, as a 14CFR135 non-scheduled domestic cargo flight, was substantially damaged while landing at Boise Air Terminal, Boise, Idaho. Visual meteorological conditions prevailed and an instrument flight plan was filed. The captain, an airline transport pilot, and commercially-rated first officer were uninjured. The flight originated from Eppley Field, Omaha, Nebraska, approximately two hours and 45 minutes prior to the accident. In a written statement prepared by both the captain and first officer, the pilots reported that while on final approach to runway 10L, the captain instructed the first officer to lower the landing gear. After the gear handle was placed in the down position, the pilots noted that the down-and-locked indication (green light) for the left main gear was not illuminated. The pilots completed the abnormal gear extension procedures (A through C) as outlined by the checklist, (see attached Landing Gear checklist) but were unable to extend the left main gear. After confirming that the left main gear was not extended, the pilot was cleared to land on runway 10L. During the landing roll-out, the aircraft skidded off the runway, and came to rest on the north side of the runway. The aircraft received substantial damage to the left aileron and leading edge devices. After the accident, a maintenance crew lifted the left wing and then opened the emergency gear panel and pulled the left hand cable for the left-hand main gear uplock. The door lock released, and the left main gear door opened and the gear extended. The maintenance crew then pushed the gear into the down locks. Further inspection of the landing gear revealed that the pin, (part number MY20248-001) which is part of the forward gear door lock, (part number VTS4424) was corroded (rusted) and cracked at the point of rotation (see attached Illustrated Parts Catalog and Figures). The mechanic performing the inspection reported that a more detailed inspection of the landing gear door locks might have prevented this accident. ## Aircraft - Registration: [N216SA](https://openairdocs.org/deregistered/N216SA-2018-01-11), registration cancelled 2018-01-11, S/N 16 (OpenAirDocs) - Reported make and model: Dassault DA-20 - Registry model: [Dassault/Sud FAN JET FALCON](https://openairdocs.org/model/dassault-sud-fan-jet-falcon) (registry code 2720302) (OpenAirDocs) - Registry engine: [GE CF700 series](https://openairdocs.org/engine/ge-cf700-series) (registry code 30010, turbo-fan) (OpenAirDocs) - Category: Airplane - Serial number: 16 - Airframe hours: 28855 - Engines: GE CF-700 4500 lbs thrust turbo fan - Damage: Substantial damage - Flight: Part 135 - Operator: Smith Air, Inc. - Registered owner: Rbs Aviation Group - Airworthiness certificate: Standard, Normal - Last inspection: AAIP, October 27, 1999, 142 hours before - Departed: OMA, OMAHA, NE - Destination: BOI - Flight plan: IFR - Airport: BOI, Boise Air Terminal, runway 10L, 10,000 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 48; flight instructor, airline transport, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 19,519 total, 341 in this make and model, 17,143 as pilot in command, 208 in the last 90 days, 106 in the last 30 days ## Weather - Conditions: Visual (VMC), Night/dark - Wind: 140° at 9 knots - Visibility: 10 statute miles - Lowest ceiling: 7,000 ft broken - Temperature: 43 °F, dew point 36 °F - Altimeter: 29.00 inHg - Observed at: BOI ## 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 19991127041999A](https://openairdocs.org/incident/19991127041999A), Nov 27, 1999: Amd FALCON, Boise, ID, Substantial damage. (-23) The aircraft's left main gear did not extend. After unsuccessfully attempting to lower the left main gear, the pilot, [privacy data omitted] landed 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.