Applicability: All model SD3-60 series aApplicability: All model SD3-60 series aeroplanes equipped with AAR Oklahoma, Inc. freon air conditioning systems, installed in accordance with STC SA3749SW.

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Applicability: All model SD3-60 series aeroplanes equipped with AAR Oklahoma, Inc. freon air conditioning systems, installed in accordance with STC SA3749SW.

Requirement: Action in accordance with FAA AD 90-15-07 Paragraphs A and B.

Note 1: Operators of affected aircraft who elect to comply with Paragraph B. 1. of the FAA AD are required to have an Australian Flight Manual amendment specifying the required action. In lieu of inserting a copy of the AD in the flight manual, operators intending to take this course of action must prepare and submit a suitable flight manual to their local CAA Field Office for Approval.

Note 2: Copies of FAA AD 90-15-07 may be obtained by contacting Mr Sam Lovell, Airplane Certification Office, FAA, South-west Region, Fort Worth, Texas, 76193- 0150. Telephone (817) 624-5159; Copies of the AAR Oklahoma Inc. Service Information Letter 5-90-1 dated June 7 1990 referred to in the FAA AD may be obtained from AAR Oklahoma Inc., 6611 S. Meridian Avenue, PO Box 59100, Oklahoma City, Oklahoma 73159. Copies of both these Documents may also be viewed at local Civil Aviation Authority (CAA) Field Offices or the CAA Head Office, Continuing Airworthiness Documentation Section, Alan Woods Building, 25 Constitution Avenue, Canberra City ACT.