# NTSB SEA99LA091: Cessna 180G, N4707U, Kalispell, MT, June 19, 1999 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: June 19, 1999, 11:30 local (17:30 UTC) - Place: Kalispell, MT - Coordinates: 48.190258, -114.379776 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=48.1903&lon=-114.3798&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report May 17, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 46655 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA99LA091 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/46655/pdf - Page: https://openairdocs.org/ntsb/SEA99LA091 ## Probable cause An encounter with a crosswind gust, which was not possible to compensate for. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - On ground/water encounter with weather, landing - roll - weather condition - gusts (cause) - weather condition - crosswind (cause) - compensation for wind conditions - not possible (cause) - Dragged wing,rotor,pod,float or tail/skid, landing - roll ## Analysis The pilot reported that during landing roll on runway 31, 'a strong gust of wind hit the plane and lifted it up', and that 'when this happened the wind got under my left wing and lifted it up.' He stated that 'at this point the plane was moving [too] slow to have effective control to counter [the] wind and the right wing scraped the runway.' The pilot reported that no mechanical malfunction or failure was involved. Winds at a nearby airport were reported as southwesterly with gusts up to 21 knots, and a gust factor (gust speed minus sustained wind speed) of 7 to 11 knots, during the time frame of the accident. ## Factual narrative On June 19, 1999, approximately 1130 mountain daylight time, a Cessna 180G, N4707U, was substantially damaged when a wingtip contacted the runway during landing at Kalispell City Airport, Kalispell, Montana. The private pilot-in-command, who was the registered owner of the aircraft and its sole occupant at the time, was not injured in the accident. Visual meteorological conditions prevailed and no flight plan was filed for the 14 CFR 91 personal flight from Missoula, Montana. The pilot reported that approaching Kalispell, he obtained wind information from Kalispell UNICOM, and that the UNICOM operator reported winds variable at 6 to 8 knots with gusts to 15 knots. The pilot reported that during landing rollout on runway 31, "a strong gust of wind hit the plane and lifted it up." The pilot stated that "when this happened the wind got under my left wing and lifted it up", and that "at this point the plane was moving [too] slow to have effective control to counter [the] wind." The pilot reported that the aircraft's right wing then scraped the runway, damaging the end of the aileron. The pilot stated that he kept the plane going straight on the runway, and that the wind then died down and the plane's left wing then came back down. The pilot indicated on his NTSB accident report that no mechanical malfunction or failure was involved in the accident. Kalispell City has one runway, 13/31, which is 3,600 feet long, 60 feet wide, and paved. Winds at Glacier Park International Airport, Kalispell, Montana (9 nautical miles north-northeast of Kalispell City Airport) were reported as being from 220 degrees true at 10 knots, gusting to 21 knots, in its 1056 METAR observation, and from 230 degrees true at 11 knots, gusting to 18 knots, in its 1156 METAR observation. ## Aircraft - Registration: [N4707U](https://openairdocs.org/aircraft/N4707U), registered now, S/N 18051407, built 1964 (OpenAirDocs) - Reported make and model: Cessna 180G - Registry model: [Cessna 180G](https://openairdocs.org/model/cessna-180g) (registry code 2072616) (OpenAirDocs) - Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 18051407 - Airframe hours: 4600 - Engines: Continental O-470-R 230 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Ryan E. Mannix - Airworthiness certificate: Standard, Normal - Last inspection: Annual, January 2, 1999, 60 hours before - Departed: MSO, MISSOULA, MT - Destination: S27 - Airport: S27, Kalispell City, runway 31, 3,600 × 60 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 29; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 278 total, 36 in this make and model, 225 as pilot in command, 17 in the last 90 days, 8 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 202° at 10 knots, gusting 21 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 68 °F, dew point 41 °F - Altimeter: 29.00 inHg - Observed at: FCA, 9 nm away ## 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 19990619024049A](https://openairdocs.org/incident/19990619024049A), Jun 19, 1999: Cessna 180G, Kalispell, MT, Substantial damage. (.19) On June 19, 1999, approximately 1130 mountain daylight time, a Cessna 180G, N4707U, was substantially damaged in a loss of control and ground loop during… ## Other investigations on N4707U (2) 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 ANC05CA145](https://openairdocs.org/ntsb/ANC05CA145), Sep 4, 2005: Cessna 180 (N4707U), McGrath, AK, substantial damage. Probable cause: The pilot's failure to maintain control of the airplane during the landing roll, which resulted in a nose over. - [NTSB ANC81DAG78](https://openairdocs.org/ntsb/ANC81DAG78), Sep 12, 1981: Cessna 180 (N4707U), Egegik, AK, substantial damage 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.