# NTSB SEA07LA056: Martin/Harris Harmon Rocket, N141RH, Troutdale, OR, January 31, 2007 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: January 31, 2007, 10:10 local (18:10 UTC) - Place: Troutdale, OR - Coordinates: 45.551109, -122.431388 - Nearby events: https://openairdocs.org/map.md?lat=45.5511&lon=-122.4314&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report May 29, 2007 - Report: Approved by Office Director - Parties: Portland FSDO - NTSB case key (mKey): 65219 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA07LA056 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/65219/pdf - Page: https://openairdocs.org/ntsb/SEA07LA056 ## Probable cause A total loss of power for undetermined reasons just as the aircraft was maneuvering to enter the downwind for landing. The absence of a suitable landing location was a factor in the accident. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, approach - vfr pattern - downwind - reason for occurrence undetermined (cause) - Forced landing, descent - emergency - Gear collapsed, landing - flare/touchdown - terrain condition - none suitable (contributing factor) - landing gear - overload ## Analysis The aircraft's engine started to run rough almost immediately after takeoff, but after switching fuel tanks and turning the boost pump on, the pilot was able to get it to run smoothly. Since he did not want to make his first landing in the recently purchased aircraft at the small field that he just departed from, he decided to fly to a larger airport that he thought was a little over five minutes away. As he neared the airport, the engine began to run only intermittently, and eventually stopped running altogether. Because he was unable to reach the airport, the pilot attempted a forced landing on a residential street. During the landing sequence the aircraft experienced a collapse of the main landing gear, and sustained further damage when it contacted the curb of the street. A post-accident inspection was unable to determine the cause of the power loss. ## Factual narrative On January 31, 2007, approximately 1010 Pacific standard time, an experimental Martin/Harris Harmon Rocket, N141RH, experienced a collapse of the main landing gear during a power-off forced landing on a residential street about one mile west of Portland-Troutdale Airport, Troutdale, Oregon. The private pilot, who was the sole occupant, received minor injuries, and the aircraft, which had been purchased by the pilot one day prior to the accident, sustained substantial damage. The 14 CFR Part 91 personal pleasure flight, which was en route to Portland-Troutdale Airport, was being operated in visual meteorological conditions. The aircraft departed Auberge Des Fleurs airstrip, near Sandy, Oregon, about 10 minutes prior to the accident. No flight plan had been filed. According to the pilot, the engine started to run rough almost immediately after takeoff, but after switching fuel tanks and turning the boost pump on, he was able to get it to run smoothly. Since he did not want to make his first landing in the recently purchased aircraft at the small field that he had just departed from, he decided to head for Portland-Troutdale Airport, which he figured was a little over five minutes away. As he neared the airport, the engine began to run only intermittently, and eventually stopped running altogether. It then started again, and ran at almost full power for about 15 seconds, and then quit again. The pilot initially thought he may be able to stretch the glide to the airport, but soon realized he was not going to make it that far without power. He therefore attempted a forced landing on a residential street within a development of single-family homes. During the landing sequence the aircraft experienced a collapse of the main landing gear, and sustained further damage when it contacted the curb of the street. During the post-accident inspection by an FAA airworthiness inspector, particles of fuel tank sloshing compound were found in the gascolator filter screen, but no contamination was found in the fuel or in the fuel system anywhere downstream from the gascolator. A further inspection of the engine and fuel system found no anomalies that would have contributed to the loss of power, and according to the pilot, the aircraft had between 15 and 19 gallons of fuel onboard at the beginning of the 10 minute flight. According to Lycoming's engine specification data, the engine would normally consume between 11 and 16 gallons per hour, depending on ambient conditions and how it was operated. At the termination of the inspection and testing, no clear reason for the loss of power could be established. ## Aircraft - Registration: N141RH (not matched to a registry record) - Reported make and model: Martin/Harris Harmon Rocket - Category: Airplane, amateur-built - Serial number: 36 - Airframe hours: 106 - Engines: Lycoming IO-540-C4B5 250 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Richard D. Gray - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Condition, December 1, 2006 - Departed: Sandy, OR - Destination: KTTD, Troutdale, OR - Airport: KTDD, Portland-Troutdale ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 50; injuries: minor; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; last flight review April 1, 2006; seat: front; flight hours: 1,150 total, 0 in this make and model, 1,150 as pilot in command, 6 in the last 90 days ## Weather - Conditions: Visual (VMC), Day - Wind: 80° at 20 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 39 °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 20070131001529A](https://openairdocs.org/incident/20070131001529A), Jan 31, 2007: Amtr HARMONRCKTII, Troutdale, OR, Substantial damage. (-23) Pilot experienced immediate engine sputtering at low power after taking off from grass runway (40R6). Fuel gages indicated 1/2 left, 1/4 right. Pilot… 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.