AD NUMBER: 2007-12-25
MANUFACTURER: Gulfstream
SUBJECT: Airworthiness Directive 2007-12-25
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for certain Gulfstream Model GIV-X, GV, and GV-SP series airplanes. This AD requires revising the airplane flight manuals (AFMs) of those airplanes, and doing repetitive functional checks of the forward water drain/supply valves and applicable corrective actions.

This AD also provides for optional terminating action for the repetitive functional checks.

This AD results from reports of failed forward water drain/supply valves on numerous airplanes, and reports of ice striking the wing-to-body fairings and engine nose cowls of several airplanes.

We are issuing this AD to prevent leakage from failed water drain/supply valves allowing the build-up of ice on the airplane, which could separate and strike the airplane structure aft of the failed valves; become ingested by a propulsion engine; or become a hazard to persons or property on the ground.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/