Airworthiness Directive · Amendment 39-15628 · Hydraulic power
Gulfstream Aerospace LP Model Galaxy Airplanes and Gulfstream 200 Airplanes
This AD applies to Gulfstream Model Galaxy and Gulfstream 200 airplanes, serial numbers 004 through 156, certificated in any category.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Do the following actions.
(1) Unless already done within 300 flight hours or six months prior to the effective date of this AD: Within 50 flight hours or one month after the effective date of this AD, whichever occurs first, perform a visual inspection of the clamping blocks for wear and of the hydraulic tubes to determine if any tube is loose or damaged. Clamping blocks are shown in detail B of Figure 2 of Gulfstream Service Bulletin 200-29-316, dated June 29, 2007; or in details B and C of Figure 10, Page 0, of Chapter 29-10-30, of the Gulfstream G200 Illustrated Parts Catalog.
(i) If clamping blocks are not worn, repeat the inspections specified in paragraph (f)(1) of this AD thereafter at intervals not to exceed 300 flight hours or six months, whichever comes first, until the replacement required by paragraph (f)(2) of this AD is done.
(ii) If any hydraulic tube is loose or damaged, before further flight, inspect the hydraulic tubes along their entire length for chafing, damage, and cracks.
(iii) Before further flight, repair or replace all chafed, damaged, or cracked tubes in accordance with Chapter 20-10-12 of the Gulfstream G200 Maintenance Manual, Revision 15, dated March 31, 2008; or using a method approved by either the Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA; or the Civil Aviation Authority of Israel (CAAI) (or its delegated agent).
(iv) Before further flight, replace all worn clamping blocks by doing the replacement specified in paragraph (f)(2) of this AD, except as provided by paragraph (f)(1)(v) of this AD.
(v) If Nylon 6/6 clamping blocks part number (P/N) 4AS3565055-511 are not available during the replacement specified in paragraph (f)(1)(iv) of this AD, before further flight, install new or serviceable Teflon clamping blocks P/N 4AS3565055-507. Within 300 flight hours or six months after doing the installation, do the actions specified in paragraph (f)(1) of this AD and repeat thereafter at intervals not to exceed 300 flight hours or six months, whichever comes first, until the replacement required by paragraph (f)(2) of this AD is done.
(2) Unless already done: Within 600 flight hours or one year after the effective date of this AD, whichever comes first, replace the existing Teflon clamping blocks P/N 4AS3565055-507 with Nylon 6/6 clamping blocks P/N 4AS3565055-511 in accordance with Gulfstream Service Bulletin 200-29-316, dated June 29, 2007. Accomplishment of this replacement constitutes terminating action for all inspections of the clamping blocks required by this AD. Accomplishment of this replacement also constitutes terminating action for the repetitive inspections of the hydraulic tube required by paragraphs (f)(1)(i) and (f)(1)(v) of this AD.
Note 1: This AD differs from the MCAI and/or service information as follows: (1) The MCAI does not specify service information if any tube replacement is done. This AD requires doing the replacement as specified in paragraph (f)(1)(iii) of this AD. (2) The MCAI specifies doing a one-time inspection of the installed Teflon blocks but also specifies doing repetitive inspections of temporary replacement Teflon blocks until the permanent replacement with Nylon 6/6 clamping blocks is done. This AD requires repetitive inspections of all Teflon blocks until the permanent replacement is done. (3) The MCAI specifies that doing the replacement with Nylon 6/6 clamping blocks constitutes terminating action. This AD specifies that doing the replacement with Nylon 6/6 clamping blocks constitutes terminating action for the inspections of the clamping blocks and for the repetitive inspections of the hydraulic tubes.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
