# NTSB ANC97LA141: Cessna 150H, N467SR, Yakutat, AK, September 2, 1997 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: September 2, 1997, 10:00 local (18:00 UTC) - Place: Yakutat, AK - Coordinates: 59.510574, -139.710128 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=59.5106&lon=-139.7101&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report November 10, 1998 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - NTSB case key (mKey): 3062 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC97LA141 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/3062/pdf - Page: https://openairdocs.org/ntsb/ANC97LA141 ## Probable cause A partial blockage of the main fuel supply line to the engine, caused by improper manufacture of the fuel line by unknown maintenance personnel. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(partial) - mech failure/malf, takeoff - initial climb - fuel system,line - blocked(partial) (cause) - inadequate quality control, other maintenance personnel (cause) - Overrun, takeoff - aborted - aborted takeoff - intentional, pilot in command - Nose over, emergency landing after takeoff - terrain condition - rough/uneven ## Analysis During takeoff from a 1,800-foot-long private airstrip, the engine sustained a partial loss of power. The pilot aborted the takeoff, and was unable to stop the airplane before overrunning the departure end. The nose wheel separated and the airplane nosed over. Inspection revealed a 60% blockage of the main fuel supply line to the carburetor. A flap of rubber protruded into the inner diameter of the fuel line from an end fitting. This line appeared to have been manufactured from aviation parts by an unknown mechanic. ## Factual narrative On September 2, 1997, at 1000 Alaska daylight time, a Cessna 150H airplane, N467SR, sustained substantial damage when it nosed over during an aborted takeoff from a private airstrip on the Akwe River, 30 miles southeast of Yakutat, Alaska. The private certificated pilot was uninjured. The flight was conducted under 14 CFR Part 91 as a personal flight, and was departing the Akwe River for Juneau, Alaska. Visual meteorological conditions prevailed at the time of the accident, and no flight plan was filed. The pilot stated that just after takeoff from the 1,800 feet by 50 feet sand airstrip, while accelerating in ground effect, the engine lost partial power and he was unable to climb. The pilot intentionally attempted to land back on the strip. He pulled the mixture control to idle cutoff, and turned off the magnetos and electrical master switch. The airplane was not stopped prior to the end of the strip, the nose wheel broke off, and the airplane nosed over. Postaccident inspection by an FAA airworthiness inspector revealed an internal blockage in the main fuel supply line to the carburetor. A flap of rubber material protruded from the point where the flexible line was joined to an end fitting. It was estimated by the FAA inspector, that this flap would intermittently block approximately 60% of the fuel line inner diameter, based on fuel flow. The fuel line and fittings appeared to be an assembly built from aircraft grade parts by an unknown mechanic, but not of factory construction. Review of the aircraft and engine logbooks did not reveal when this assembly was installed. ## Aircraft - Registration: [N467SR](https://openairdocs.org/deregistered/N467SR-2013-09-26), registration cancelled 2013-09-26, S/N 15069050, built 1968 (OpenAirDocs) - Reported make and model: Cessna 150H - Registry model: [Cessna 150H](https://openairdocs.org/model/cessna-150h) (registry code 2071818) (OpenAirDocs) - Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 150-69050 - Airframe hours: 5630 - Engines: Continental O-200 100 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Roy Alder Warren - Airworthiness certificate: Standard, Utility - Last inspection: Annual, July 7, 1997, 20 hours before - Departed: AKWE RIVER, AK - Destination: JNU, JUNEAU, AK ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 48; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 470 total, 440 in this make and model ## Weather - Conditions: Visual (VMC), Day - Visibility: 30 statute miles - Temperature: 55 °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 19970902025039A](https://openairdocs.org/incident/19970902025039A), Sep 2, 1997: Cessna 150H, Yakutat, AK, Substantial damage. Aircraft crashed on takeoff. (.4)during takeoff from a 1,800-foot-long Private airstrip, the engine sustained a partial loss of power. The pilot aborted 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.