# NTSB SEA06CA108: Grumman AA-1B, N8866L, Bountiful, UT, May 30, 2006 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Data collection · Final report - Date: May 30, 2006, 05:45 local (11:45 UTC) - Place: Bountiful, UT - Coordinates: 40.869445, -111.927223 - Nearby events: https://openairdocs.org/map.md?lat=40.8694&lon=-111.9272&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report October 3, 2006 - Report: Approved by Office Director - NTSB case key (mKey): 63775 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA06CA108 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/63775/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=63775 - Page: https://openairdocs.org/ntsb/SEA06CA108 ## Probable cause An obstructed windshield which resulted in the pilot misjudging the distance/altitude during an emergency landing. An oil leak as a result of a leaking crankshaft seal was a factor. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, cruise - normal - lubricating system,oil gasket - disengaged (contributing factor) - fluid,oil - leak (contributing factor) - Forced landing, emergency descent/landing - Overrun, emergency landing - window,flight compartment window/windshield - obstructed (cause) - distance/altitude - misjudged, pilot in command (cause) - On ground/water collision with object, landing - roll - object - other ## Analysis The pilot reported that this was the first flight following the airplane's annual inspection. The flight departed on runway 16 and proceeded to a point 5 to 10 miles south of the airport, "when there was a gush of oil from the front of the plane that covered the windshield." The pilot was not able to see through the windshield "at all." She returned to the airport and attempted to land on runway 34, but was "too high and fast." The pilot then entered the traffic pattern for runway 16. After landing, she applied the brakes, "but by then there was not much runway left." The airplane overran the runway and impacted a metal pipe. According to an FAA inspector who examined the airplane, the nose gear collapsed and there was damage to the firewall. The inspector determined that the source of oil on the windshield was a displaced crankshaft seal. Examination of the airplane's maintenance records by the inspector revealed that the mechanic who performed the annual inspection had replaced the crankshaft plug, but not the crankshaft seal. ## Factual narrative On May 30, 2006, about 0545 mountain daylight time, a Grumman AA-1B, N8866L, sustained substantial damage when it overran the runway and struck a pipe during an emergency landing at Skypark Airport in Bountiful, Utah. The private pilot, sole occupant of the airplane, received minor injuries. The airplane was registered to and operated by the pilot. Visual meteorological conditions prevailed and no flight plan was filed for the 14 CFR Part 91 personal flight. The flight departed Bountiful about 0535 with an intended destination of Kanab, Utah. The pilot reported that this was the first flight following the airplane's annual inspection. The flight departed on runway 16 and proceeded to a point 5 to 10 miles south of the airport and an altitude of 5,500 feet, "when there was a gush of oil from the front of the plane that covered the windshield." The pilot was not able to see through the windshield "at all." She returned to the airport and attempted to land on runway 34, but was "too high and fast." The pilot then entered the traffic pattern for runway 16. After landing, she applied the brakes, "but by then there was not much runway left." The airplane overran the runway and impacted a metal pipe. According to an FAA inspector who examined the airplane, the nose gear collapsed and there was damage to the firewall. The inspector determined that the source of oil on the windshield was a displaced crankshaft seal. Examination of the airplane's maintenance records by the inspector revealed that the mechanic who performed the annual inspection had replaced the crankshaft plug, but not the crankshaft seal. ## Aircraft - Registration: [N8866L](https://openairdocs.org/deregistered/N8866L-2018-07-10), registration cancelled 2018-07-10, S/N AA1B0666, built 1976 (OpenAirDocs) - Reported make and model: Grumman AA-1B - Registry model: [Grumman American Avn. AA-1B](https://openairdocs.org/model/grumman-american-avn-aa-1b) (registry code 3960103) (OpenAirDocs) - Registry engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505, 4 cycle) (OpenAirDocs) - Category: Airplane - Serial number: AA1B0666 - Engines: Lycoming O-235 reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Holly H. Ramsay - Airworthiness certificate: Standard, Utility - Departed: BTF, Bountiful, UT - Destination: BTF, Bountiful, UT - Airport: BTF, Skypark, runway 16 ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 52; private; airplane ratings: single-engine land; medical: class 3; flight hours: 180 total, 180 in this make and model ## Weather - Conditions: Visual (VMC), Day ## 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 20060530008139A](https://openairdocs.org/incident/20060530008139A), May 30, 2006: Amrgen AA1B, Bountiful, UT, Substantial damage. (-23) The pilot stated she took off from Bountiful Skypark airport on runway 16 heading south toward kanab, UT, and was about 5 miles from the airport when oil… ## Other investigations on N8866L (1) 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. - [NTSB ERA17FA299](https://openairdocs.org/ntsb/ERA17FA299), Aug 30, 2017: Grumman AA1 (N8866L), Portland, TN, substantial damage, 2 fatal. Probable cause: The pilot's improper fuel planning, which resulted in a total loss of engine power due to fuel exhaustion. ## Docket (1 files) The files NTSB released with the investigation on March 10, 2022, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=63775. 459 KB in all. - Pilot-operator aircraft accident report NTSB form 61201 (item 1, PDF, 10 pages, 459 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=312544&FileExtension=pdf&FileName=Pilot-Operator%20Aircraft%20Accident%20Report%20NTSB%20Form%2061201-Rel.pdf 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.