EASA AD US-2020-12-06
SUPERSEDED BY FAA AD 2022-02-15
FAA Airworthiness Directive 2020-12-06 is a final rule affecting all Gulfstream Aerospace Corporation Model G-IV airplanes. It addresses reports of un-commanded nose wheel steering turns caused by moisture entering the nose wheel steering servo valve, which can freeze and cause unintended steering during landing. This directive mandates replacement of the nose wheel steering servo valve manifold and revisions to the airplane flight manual to mitigate this unsafe condition.