# NTSB ANC02LA090: Piper PA-18-150, N4151Z, Gulkana, AK, August 5, 2002 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: August 4, 2002, 18:00 local (Aug 5, 2002, 02:00 UTC) - Place: Gulkana, AK - Coordinates: 55.92028, -159.490097 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=55.9203&lon=-159.4901&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report April 18, 2003 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - Parties: FAA Anchorage FSDO-03 - NTSB case key (mKey): 55383 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC02LA090 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/55383/pdf - Page: https://openairdocs.org/ntsb/ANC02LA090 ## Probable cause A jammed flight control system yoke/stick, which made directional control of the airplane not possible, and resulted in an in-flight collision with terrain. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of control - in flight, takeoff - initial climb - flt control syst,yoke/control stick - jammed (cause) - directional control - not possible (cause) - In flight collision with terrain/water, descent - uncontrolled - terrain condition - ground ## Analysis The pilot and passenger were on a personal cross country flight. The pilot was taking off on a gravel runway after completing a refueling stop. According to the pilot, during the initial climb, he rolled the airplane into a left turn, but when he tried to roll out of the turn, the control stick was jammed. The airplane continued in a descending left turn and impacted the ground. Postaccident inspection of the airplane by the pilot failed to disclose any flight control system mechanical anomalies. ## Factual narrative On August 4, 2002, about 1800 Alaska daylight time, a Piper PA-18-150 airplane, N4151Z, sustained substantial damage following a loss of control and in-flight collision with terrain after takeoff from the Gulkana Airport, Gulkana, Alaska. The airplane was being operated as a visual flight rules (VFR) personal flight under Title 14, CFR Part 91, when the accident occurred. The private pilot and sole passenger were not injured. Visual meteorological conditions prevailed, and no flight plan was filed. The flight originated at the McCarthy Airport, McCarthy, Alaska, about 1600, and was bound for Lake Hood Strip, Anchorage, Alaska, with a fuel stop at Gulkana. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on August 8, the pilot said he refueled the accident airplane at Gulkana, and prepared for departure. He said he and his passenger had some camping gear and food in the airplane, but they were well within the gross weight limitation of the airplane. He said it was hot, and the airport was reporting a density altitude of 3,500 feet. He chose to takeoff on the 2,100 foot gravel runway rather then the 5,000 foot paved runway, since the airplane was tundra tire-equipped. He said the winds were reported as light and variable, and that he held the airplane on the ground until his hand-held global positioning system (GPS) indicated a ground speed of 51 knots, and then lifted off. About 70 feet above ground level, he said he started a shallow left turn. He said as he rolled the airplane into the turn it started to descend, and he tried to level the wings. He said the control stick was jammed, and would not return to neutral. The airplane continued its descent, impacting the ground in a left turn. Both wings and fuselage sustained substantial damage. The pilot reported that the flight from McCarthy to Gulkana was uneventful, and that the airplane's engine was developing full power during takeoff at Gulkana. He further stated there were no known mechanical anomalies with the airplane prior to the accident. A postaccident examination by the pilot of the airplane's control system failed to disclose the reason for the control stick jam. ## Aircraft - Registration: [N4151Z](https://openairdocs.org/aircraft/N4151Z), registered now, S/N 18-8327, built 1965 (OpenAirDocs) - Reported make and model: Piper PA-18-150 - Registry model: [Piper PA-18-150](https://openairdocs.org/model/piper-pa-18-150) (registry code 7101828) (OpenAirDocs) - Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 18-8327 - Airframe hours: 3285 - Engines: Lycoming O-320-A2B 150 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Jerry Imm - Airworthiness certificate: Standard, Normal - Last inspection: Annual, May 1, 2002, 61 hours before - Departed: PAGK, Gulkana, AK - Destination: Z41, Lake Hood Strip, AK - Airport: PAGK, Gulkana, runway 14, 2,100 × 60 ft, gravel ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 69; injuries: none; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: front; flight hours: 3,300 total, 1,675 in this make and model, 3,300 as pilot in command, 43 in the last 90 days, 28 in the last 30 days, 3 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: variable at 4 knots - Visibility: 19 statute miles - Lowest ceiling: none - Temperature: 82 °F, dew point 48 °F - Altimeter: 29.94 inHg - Observed at: PAGK ## 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 20020804017419A](https://openairdocs.org/incident/20020804017419A), Aug 4, 2002: Piper PA18150, Gulkana, AK, No damage. (-23) According to the pilot, he was taking off with a four knot wind and an outside air temperature of 86 degrees. The density altitude was 3500 feet MSL. At… 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.