AD 90-02-05

90-02-05 GULFSTREAM: Amendment 39-6472. Docket No. 89-NM-177-AD. Applicability: All Model G-II (G-1159), G-III (G-1159A), G-IIB (G-1159B) and certain G-IV, Serial Numbers 1000 through 1092, series airplanes, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent an airplane taking off in an unsafe takeoff configuration, accomplish the following:

A. For all Model G-II (G-1159) and G-IIB (G-1159B) series airplanes: Within 25 hours time- in-service after the effective date of this AD, and thereafter at intervals not to exceed 150 hours time-in- service, perform an operational check of the takeoff warning system, and repair, if necessary, in accordance with Gulfstream Aerospace Customer Bulletin Number 388, Amendment 1, dated August 15, 1989. If the system does not function properly, it must be repaired prior to further flight, in accordance with the Customer Bulletin.

B. For all Model G-III (G-1159A) series airplanes: Within 25 hours time-in-service after the effective date of this AD, and thereafter at intervals not to exceed 150 hours time-in-service, perform an operational check of the takeoff warning system, in accordance with Gulfstream Customer Bulletin Number 106, dated May 1, 1989. If the system does not function properly, it must be repaired prior to further flight, in accordance with the Customer Bulletin.

C. For Model G-IV series airplanes, Serial Numbers 1000 through 1092: Within 25 hours time-in-service after the effective date of this AD, perform an operational check and modification of the takeoff range warning indication switches, in accordance with Gulfstream Aircraft Service Change Number 122, dated May 31, 1989. A functional check must be repeated at intervals not to exceed 150 hours time- in-service. If the system does not function properly, it must be repaired prior to further flight, in accordance with the Service Change.

D. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Atlanta Aircraft Certification Office, FAA, Small Airplane Directorate.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI) or Principal Avionics Inspector (PAI), who will either concur or comment, and then send it to the Manager, Atlanta Aircraft Certification Office.

E. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Gulfstream Aerospace Corporation, P.O. Box 2206, M/S D-10, Savannah, Georgia 31402-9980. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the FAA, Small Airplane Directorate, Atlanta Aircraft Certification Office, 1669 Phoenix Parkway, Suite 210C, Atlanta, Georgia.

This amendment (39-6472, AD 90-02-05) becomes effective on February 13, 1990.