# NTSB ANC05LA065: Piper PA-18-160, N624MW, Wasilla, AK, April 28, 2005 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: April 27, 2005, 19:30 local (Apr 28, 2005, 03:30 UTC) - Place: Wasilla, AK - Coordinates: 61.571666, -149.540283 - Nearby events: https://openairdocs.org/map.md?lat=61.5717&lon=-149.5403&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report January 31, 2006 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - Parties: FAA, Anchorage Flight Standards District Office - NTSB case key (mKey): 61415 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC05LA065 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/61415/pdf - Page: https://openairdocs.org/ntsb/ANC05LA065 ## Probable cause The pilot's selection of an unsuitable landing area, which resulted in a loss of control during the landing roll, and a collision with a ditch. A factor associated with the airplane was a leaking brake assembly and diminished braking efficiency. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - On ground/water encounter with terrain/water, landing - roll - Loss of control - on ground/water, landing - roll - terrain condition - rough/uneven (contributing factor) - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (cause) - brakes(normal) - diminished (contributing factor) - On ground/water encounter with terrain/water, landing - roll - terrain condition - ditch ## Analysis The private pilot was landing his tundra-tire equipped tailwheel airplane at the conclusion of a 14 CFR Part 91 personal flight on a non-maintained dirt overrun of a hard-surfaced runway. During the landing roll, the tires encountered deep ruts and soft dirt, and the pilot stated that he was unable to maintain directional control. He indicated that the right brake felt flat and ineffective, and may have contributed to his difficulty in maintaining control. An aviation mechanic who repaired the airplane after the accident noted that the brake assembly had a slow fluid leak, and the braking action may have been diminished at the time of the accident. The mechanic said he replaced portions of the right brake assembly while repairing the airplane. ## Factual narrative On April 27, 2005, about 1930 Alaska daylight time, a tundra tire equipped Piper PA-18-160 airplane, N624MW, sustained substantial damage following a loss of control and collision with a ditch while landing at the Wasilla Airport, Wasilla, Alaska. The solo private pilot was not injured. The 14 CFR Part 91 local personal flight operated in visual meteorological conditions without a flight plan. The flight departed Wasilla about 1700. During a telephone conversation with the NTSB investigator-in-charge (IIC) on April 29, the pilot related that he was landing on the dirt airstrip, runway 21, at Wasilla, when the main landing gear tires encountered a rut, and he lost directional control of the airplane. He said the airplane veered immediately to the left, and the left rudder "bottomed out" making it difficult to apply full right rudder and make a correction. He stated that he applied full right brake, but that the brake was ineffective, and may have failed to operate properly. The airplane continued to the left, and encountered a ditch. The pilot indicated that the airport manager should be made aware of the rutted runway, before someone else has an accident. Following the conversation with the pilot, the IIC contacted the Wasilla Airport manager. The airport manager indicated that there are no dirt or gravel runways at the Wasilla Airport, and that runway 21 is hard surfaced asphalt. He noted that there is an area before the approach end of runway 21 that is dirt and gravel, but it is not designated as a portion of the runway, and it is not maintained as such. A review of the FAA Alaska Supplement and Airport Directory disclosed only one runway at the Wasilla Airport, runway 21-03, which is asphalt covered. The IIC contacted the aviation mechanic who repaired the airplane. The mechanic stated that the right brake assembly had a slow leak, which could have allowed the brake pressure to bleed down and the brake to be less effective. The mechanic indicated he rebuilt the brake assembly following the accident. ## Aircraft - Registration: N624MW (not matched to a registry record) - Reported make and model: Piper PA-18-160 - Category: Airplane - Serial number: 18-8739 - Airframe hours: 1844 - Engines: Lycoming O-320-A2B 160 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Thomas F. Watkins - Airworthiness certificate: Standard, Normal - Last inspection: Annual, July 1, 2005, 62 hours before - Departed: PAWS, Wasilla, AK - Airport: PAWS, Wasilla ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 52; injuries: minor; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; seat: front; flight hours: 1,850 total, 1,800 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 211° at 7 knots - Visibility: 50 statute miles - Lowest ceiling: none - Temperature: 64 °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 20050427007609A](https://openairdocs.org/incident/20050427007609A), Apr 27, 2005: Piper PA18150, Wasilla, AK, Substantial damage. (-23) The pilot was landing at the Wasilla aiport on a gravel strip next to the main runway. This landing was into the sun which covered up the fact that some… 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.