AD 91-02-04

91-02-04 GROB WERKE GMBH & CO. KG (GROB): Amendment 39-6823; Docket No. 90-CE-29-AD.

Applicability: Models G103 "Twin Astir" (including "Trainer") gliders (Serial Numbers (S/N) 3000 through 3291) and G103 "Twin II" (including "ACRO") gliders (S/N 3501 through 3729), certificated in any category.

Compliance: Required within the next 50 hours time-in-service after the effective date of this AD, unless already accomplished.

To preclude the incorrect installation of the aileron system connecting bolt, accomplish the following:

(a) Modify the aileron control system by installing a GROB forkhead nut (GROB part number 103B-4229) and removing the placard that cautions against incorrect installation of the connecting bolts located on the aileron control lever adjacent to the connecting bolt, if installed, as described in GROB Service Bulletin No. TM 315-38/1, dated December 12, 1989.

(b) An alternate method of compliance or adjustment of the compliance time thatprovides an equivalent level of safety may be approved by the Manager, Brussels Aircraft Certification Staff, Europe, Africa, and Middle East Office, FAA, c/o American Embassy, B-1000 Brussels, Belgium; Telephone (322) 513.38.30 ext. 2718; Facsimile (322) 230.68.99. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Brussels Aircraft Certification Staff.

(c) All persons affected by this directive may obtain copies of the document referred to herein upon request to GROB Systems, Incorporated; Aircraft Division, I-75 and Airport Drive, Bluffton, Ohio 45817; Telephone (419) 358-9015; or may examine this document at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106.

This amendment (39-6823, AD 91-02-04) becomes effective on February 8, 1991.