AD 2007-12-25 Airworthiness Directives; Gulfstream Model GIV-X, GV, and GV-SP Series Airplanes

Models named: GIV-X, GV, GV-SP series. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Gulfstream Model GIV-X, GV, and GV-SP series airplanes, certificated in any category; as identified in the alert customer bulletins specified in Table 1 of this AD. Table 1.—Gulfstream Alert Customer Bulletins Airplane model Alert Customer Bulletin Date GIV-X G350 Number 5 April 11, 2007.   G450 Number 5 April 11, 2007. GV GV Number 26 April 11, 2007. GV-SP G500 Number 7 April 11, 2007.   G550 Number 7 April 11, 2007.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Airplane Flight Manual (AFM) Revision and Valve Functional Check (f) Within 20 flight hours after the effective date of this AD: Revise the Normal Procedures section of the AFMs to include the information in the applicable AFM supplement identified in Table 2 of this AD. This may be done by inserting a copy of the supplement into the AFM. Table 2.—AFM Supplements Airplane model AFM supplement Date GIV-X G350-2007-01 April 12, 2007.   G450-2007-02 April 12, 2007. GV GV-2007-04 April 12, 2007. GV-SP G500-2007-03 April 12, 2007.   G550-2007-05 April 12, 2007. Note 1: For airplanes that are operated under and in accordance with the Joint Aviation Authority (JAA)/European Aviation Safety Agency (EASA) regulations, supervision, and oversight: EASA has advised us that revising the Normal Procedures section of the AFMs to include the information in the JAA Gulfstream AFM revisions specified in Table 3 of this AD, as applicable, is acceptable for compliance with the requirements of paragraph (f) of this AD. Table 3.—JAA Gulfstream AFM Revisions Airplane model JAA AFM revisions Date GIV-X JAA-G350-2007-01 May 21, 2007.   JAA-G450-2007-01 May 21, 2007. GV JAA-GV-2007-02 May 21, 2007. GV-SP JAA-G500-2007-03 May 21, 2007.   JAA-G550-2007-03 May 21, 2007. (g) Before further flight following accomplishment of the AFM revision required by paragraph (f) of this AD: Perform a functional check of the forward water system water drain/supply valves and do applicable corrective actions, in accordance with the applicable AFM supplement identified in Table 2 of this AD. Do the functional check at the times specified in paragraphs (g)(1) and (g)(2) of this AD. Either the cockpit flightcrew or certificated maintenance personnel may perform these functional checks. If the water system has been deactivated as part of the corrective actions, the functional checks need not be performed again until the water system is reactivated. Doing the optional terminating action specified by paragraph (g) of this AD ends the requirement for the repetitive functional checks. (1) Before the first flight of the day. (2) Before further flight when the airplane is exposed to freezing conditions on the ground after the airplane has been powered down. Optional Terminating Action (h) Doing the actions described in paragraphs (h)(1) and (h)(2), as applicable, of this AD terminates the functional checks required by paragraph (g) of this AD. After the actions specified in paragraphs (h)(1) and (h)(2), as applicable, of this AD have been done, the applicable AFM supplement specified in paragraph (f) 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 airplane 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 2: Help is available from Gulfstream for determining a missing or otherwise indeterminate part number of any water drain/supply valve. Parts Installation (i) As of the effective date of this AD, no person may install a water supply valve having P/N 4E4151-1, or a water drain valve having P/N 4E4151-3, on any airplane. No Reporting Required (j) Although the alert customer bulletins referred to in this AD specify to submit certain information to the manufacturer, this AD does not include that requirement. Alternative Methods of Compliance (AMOCs) (k)(1) The Manager, Atlanta Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. (2) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. Material Incorporated by Reference (l) You must use the service information identified in Table 4 and Table 5 of this AD to perform the actions that are required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approved the incorporation by reference of these documents in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Gulfstream Aerospace Corporation, Technical Publications Dept., P.O. Box 2206, Savannah, Georgia 31402-2206, for a copy of this service information. You may review copies at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html. Table 4.—Gulfstream Alert Customer Bulletins Bulletin No. Date G350 Number 5 April 11, 2007. G450 Number 5 April 11, 2007. GV Number 26 April 11, 2007. G500 Number 7 April 11, 2007. G550 Number 7 April 11, 2007. Table 5.—Gulfstream Airplane Flight Manual Supplements Supplement No. Date G350-2007-01 April 12, 2007. G450-2007-02 April 12, 2007. GV-2007-04 April 12, 2007. G500-2007-03 April 12, 2007. G550-2007-05 April 12, 2007. Issued in Renton, Washington, on June 8, 2007. Stephen P. Boyd, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7-11587 Filed 6-19-07; 8:45 am] BILLING CODE 4910-13-P

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.