Cessna 180 Skywagon
Flight Crew Private
Flight Crew Last 90 Days 9; Flight Crew Total 676; Flight Crew Type 199
Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Regained Aircraft Control
Environment - Non Weather Related; Procedure
Both aircraft were inbound over Knik arm. The Cessna 180J (wheel penetration wheel ski equipped) was 1 mile ahead and was instructed by ATC to 'keep their speed up.' Cessna 180 was cleared to land runway 25 and helicopter was cleared to land north of taxiway alpha (alpha is north of runway 25). Helicopter was warned that landing was at their own risk. The wind was steady from the north at approximately 3-4 knots. Cessna 180 had landed and about 3 seconds into rollout when a loss of control was experienced. Aircraft violently swerved right and rocked up on left landing gear. The aircraft continued to slide sideways for 2-3 seconds apparently sliding on wear strip on ski until control was regained. The loss of control was immediately as Cessna passed helicopter leading to the conclusion that the north wind had blown the helicopter's wake turbulence into Cessna's landing area.Neither the flying pilot nor the passenger in the Cessna (also a pilot) were aware of the risk of the helicopter wake turbulence. No warning was issued by ATC to the Cessna about wake turbulence. If this hazard was recognized; there were many ways to mitigate it. The Cessna could have been allowed to land first; the Cessna could have landed on another runway (runway 34 was available); the Cessna could have circled until the helicopter landed and spooled down; etc. In the interest of safety; it is highly recommended that ATC warn and or avoid situations were helicopter wake turbulence can lead to a loss of control of a fixed wing aircraft.
C180 pilot reported loss of directional control on landing rollout when he encountered wake turbulence and rotor blast from a helicopter landing nearby.