AD 90-02-09

90-02-09 GROB WERKE GmbH & COMPANY KG (BURKHART GROB): Amendment 39-6447.

Applicability: Models TWIN ASTIR and TWIN ASTIR TRAINER (Serial Numbers (S/N) 3000 through 3291); G103 TWIN II (S/N 3501 through 3878, and 33879 through 34078); and G103A TWIN II ACRO (S/N 3544 through 34078) gliders certificated in any category.

Compliance: Required as indicated after the effective date of this AD, unless already accomplished.

To preclude failure of the wing spar spigots, accomplish the following:

(a) Within the next 500 takeoffs after the effective date of this AD, inspect the wing spar spigots for damage in accordance with the ultrasonic inspection procedures specified in GROB WERKE GmbH Technical Information TM 315-36, dated June 23, 1988.

(1) If damage is found, prior to further flight remove and replace the spigot with a Fail-Safe Spigot using the procedures specified in the above-referenced service information.

(2) If no damage is found, within the next 500 takeoffs remove and replace the spigots with Fail-Safe Spigots using the procedures specified in the above-referenced service information.

NOTE 1: Note 5 in the Type Certificate Data Sheet G39EU Burkhart Grob Model G103 Twin Astir, Model G103 Twin II, and Model G103A Twin II Acro, Revision 3, dated April 2, 1984, states:

"Major airframe repairs must be accomplished at FAA certified repair stations rated for composite construction of small aircraft, using Grob Werke repair methods for the model of interest, approved by the FAA."

The replacement of the wing spigots is considered major airframe repair.

(b) An alternate method of compliance or adjustment of the compliance times which provides an equivalent level of safety may be approved by the Manager, Brussels Aircraft Certification Staff, FAA, c/o American Embassy, 15 Rue de la Loi B1040, Brussels, Belgium.

NOTE 2: The request should be forwarded through an FAA Maintenance Inspector, who may add comments and send it to the Manager, Brussels Aircraft Certification Staff.

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; or may examine this document at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106.

This amendment (39-6447, AD 90-02-09) becomes effective on February 5, 1990.