# NTSB SEA07LA114: Britten-Norman BN-2A-20, N634MA, Hamilton, MT, April 28, 2007 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: April 28, 2007, 11:05 local (17:05 UTC) - Place: Hamilton, MT - Coordinates: 46.255554, -114.123611 - Nearby events: https://openairdocs.org/map.md?lat=46.2556&lon=-114.1236&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report December 20, 2007 - Report: Approved by Office Director - Parties: Helena FSDO - NTSB case key (mKey): 65653 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA07LA114 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/65653/pdf - Page: https://openairdocs.org/ntsb/SEA07LA114 ## Probable cause The loss of power in one engine, for undetermined reasons, soon after establishing the takeoff departure climb. Factors include rough/uneven terrain. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, takeoff - initial climb - reason for occurrence undetermined (cause) - Forced landing, descent - emergency - Gear collapsed, emergency landing after takeoff - terrain condition - rough/uneven (contributing factor) ## Analysis During the initial climb after takeoff, just after the aircraft passed 400 feet above ground level (agl), the pilot shut off the fuel boost pumps in preparation for the en route climb. Soon thereafter, one of the engines lost power without warning, and because he was carrying a heavy load, he immediately feathered the propeller and started looking for a place to put the aircraft down. Because there was rising terrain and scattered houses south of the airport, he had to maneuver to get to an open area. During the forced landing on the uneven terrain, one of the landing gear legs collapsed, and the aircraft impacted the terrain and slid into a power pole. A post-accident teardown inspection of the engine and the aircraft systems did not reveal any anomalies that would have resulted in the failure of the engine that lost power. ## Factual narrative On April 28, 2007, at 1105 mountain daylight time, a Britten-Noman BN-2A-20, N634MA, experienced a gear collapse during an engine-out forced landing about two miles south of Ravalli County Airport, Hamilton, Montana. The airline transport pilot, who was the sole occupant, received minor injuries, and the aircraft, which is operated by McCall Aviation, McCall, Idaho, sustained substantial damage. The 14 CFR Part 135 cargo flight was departing for Selway Lodge, Idaho, and was being operated in visual meteorological conditions. The aircraft was on a company VFR flight plan, and there was no report of an ELT activation. According to the pilot, during the initial climb after takeoff, as he was passing 400 feet above ground level (agl), he shut off the fuel boost pumps in preparation for the en route climb. Soon thereafter, one of the engines quit without warning, and because he was carrying a heavy load, he immediately feathered the propeller and started looking for a place to put the aircraft down. Because there was rising terrain and scattered houses south of the airport, he had to maneuver to get to an open area. During the forced landing on the uneven terrain, one of the landing gear legs collapsed, and the aircraft impacted the terrain and then slid into a power poll. A post-accident teardown inspection of the engine and the aircraft systems did not reveal any anomalies that would have resulted in the failure of the engine that lost power. ## Aircraft - Registration: [N634MA](https://openairdocs.org/deregistered/N634MA-2009-01-20), registration cancelled 2009-01-20, S/N 464, built 1975 (OpenAirDocs) - Reported make and model: Britten-Norman BN-2A-20 - Registry model: [Britten-Norman BN-2A-20](https://openairdocs.org/model/britten-norman-bn-2a-20) (registry code 1520220) (OpenAirDocs) - Registry engine: [Lycoming IO-540 series](https://openairdocs.org/engine/lycoming-io-540-series) (registry code 41530, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 464 - Airframe hours: 16257 - Engines: Lycoming IO-540-K1B5 300 horsepower reciprocating - Damage: Substantial damage - Flight: Part 135 - Operator: McCall Aviation, doing business as McCall Air - Registered owner: Wilderness Aircraft, LLC - Airworthiness certificate: Standard, Normal - Last inspection: Continuous airworthiness, March 1, 2007 - Departed: 6S5, Hamilton, MT - Destination: Selway Lodge, ID - Flight plan: Company VFR - Airport: 6S5, Ravalli County Airport ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 61; injuries: minor; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review August 1, 2006; seat: left; flight hours: 13,000 total, 2,750 in this make and model, 12,500 as pilot in command, 36 in the last 90 days, 8 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 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 20070428006199A](https://openairdocs.org/incident/20070428006199A), Apr 28, 2007: Bnorm BN2A20, Hamilton, MT, Destroyed. (-23) On April 28, 2007, at 10:59 a.m. mountain daylight time, a britten-norman BN-2A lost power to the right engine shortly after take-off at the Ravalli… 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.