AD 87-18-10 ACTIVE

87-18-10 INTREPRINDEREA DE CONSTRUCTII AERONAUTICE: Amendment 39- 5695. Applies to Model IS-28B2 gliders through serial number 160 inclusive certificated in any category.

Compliance is required as indicated unless already accomplished.

To prevent the failure of the aileron control levers and forks which could result in the glider becoming uncontrollable, accomplish the following:

(a) Within the next 5 hours time-in-service after the effective date of this AD unless compliance with paragraph (c) has been accomplished, visually inspect the aileron control levers P/N 30AD.02.028 and aluminum NIA 181-2 forks using a 10 power or greater magnifying glass for cracks or deformation.

(b) If a cracked or deformed part is found during the inspection required by paragraph (a) of this AD, before further flight, replace the aileron control levers and forks with serviceable levers and forks, new design P/N 30AD.02.028 lever and steel NIA 201-2 fork, in accordance with the accomplishment instructions of Intreprinderea De Constructii Aeronautice Service Bulletin No. IS-28B2-E0-14, dated August 20, 1985. NOTE: The manufacturer has assigned the same part number to the new design aileron lever as the original design aileron lever. The new lever can be identified by measuring the length of the section which is reduced in thickness on the longer arm of the aileron lever. The new design aileron lever is reduced in thickness 42mm from the end of the longer arm whereas the old design aileron lever is reduced in thickness 27mm from the end of the longer arm.

(c) Prior to September 30, 1987, replace any aileron control system levers and forks not replaced in accordance with paragraph (b) of this AD, with serviceable levers and forks, new design P/N 30AD.02.028 lever and steel NIA 201-2 fork, in accordance with Intreprinderea De Constructii Aeronautice Service Bulletin No. IS-28B2-E0-14 dated August 20, 1985. NOTE: The aileron levers removed from service should be destroyed or disfigured to prevent reuse.

Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Brussels Aircraft Certification Office, AEU-100, Europe, Africa, and Middle East Office, Federal Aviation Administration, c/o American Embassy, 15 Rue de la Loi B-1040, Brussels, Belgium; telephone 513.38.30 ext. 2710, or the Manager, Federal Aviation Administration, New England Region, Aircraft Certification Division, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581; telephone 516-791-6680.

Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, Brussels Aircraft Certification Office, or the Manager, New York Aircraft Certification Office, may adjust the compliance time specified in this AD.

Intreprinderea De Constructii Aeronautice Service Bulletin No. IS-28B2-E0-14, dated August 20, 1985, identified and described in this document, is incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received this document from the manufacturer may obtain copies upon request to Sprague Aviation Incorporated, 699 Linwood, Vacaville, California 95688. This document also may be examined at the Office of the Regional Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Room 311, Burlington, Massachusetts 01803, Rules Docket 87-ANE-01 between the hours of 8:00 a.m. and 4:30 p.m.; Monday thru Friday, except federal holidays.

This amendment becomes effective on September 3, 1987.