Document ID: chunk:federal_register_of_legislation:F2007L02165:body:0:p2
Version: federal_register_of_legislation:F2007L02165
Segment Type: other
Provision Reference: 
Character Range: 3091–5605

Requirement 1 of this AD may be removed from the AFM.

                  (1) Inspect to determine the part numbers of the forward water drain/supply valves, in accordance with Part II of the Accomplishment Instructions of the applicable alert customer bulletin identified in Table 1 of this AD.  A review of aeroplane maintenance records is acceptable in lieu of this inspection if the part numbers of the drain/supply valves can be conclusively determined from that review.

                  (2) Replace any water supply valve having part number (P/N) 4E4151-1 with a new, improved water supply valve having P/N 4E4491- 1, and any water drain valve having P/N 4E4151-3 with a new, improved water drain valve having P/N 4E4493-1; in accordance with Part III of the Accomplishment Instructions of the applicable alert customer bulletin identified in Table 1 of this AD.  If the P/N of any water drain/supply valve is missing or cannot be determined, replace the water drain/supply valve with a new, improved water drain/supply valve, as applicable.

             Note 1:  Help is available from Gulfstream for determining a missing or otherwise indeterminate part number of any water drain/ supply valve.

             Note 2:  FAA AD 2007-12-25 Amdt 39-15104 dated 8 June 2007 refers.
Compliance:     1. Within 20 flight hours after the effective date of this AD, unless previously accomplished.

                2. Before further flight following accomplishment of the AFM revision required by Requirement 1 of this AD at the following intervals:

                  (a) Before the first flight of the day.

                  (b) Before further flight when the aeroplane is exposed to freezing conditions on the ground after the aeroplane has been powered down.

                3. From the effective date of this AD.
             This Airworthiness Directive becomes effective on 10 July 2007.
Background:  This AD results from reports of failed forward water drain/ supply valves on numerous aeroplanes, and reports of ice striking the wing-to-body fairings and engine nose cowls of several aeroplanes.  The issuing of this AD is intended to prevent leakage from failed water drain/ supply valves allowing the build-up of ice on the aeroplane, which could separate and strike the aeroplane structure aft of the failed valves; become ingested by a propulsion engine; or become a hazard to persons or property on the ground.

David Punshon
Delegate of the Civil Aviation Safety Authority

4 July 2007