81-07-01 R1 GOVERNMENT AIRCRAFT FACTORIES (GAF): Amendment 39-4068 as amended by Amendment 39-4388. Applies to Nomad Model N22B (Serial Nos. N22B-5 and up) and N24A (Serial Nos. N24A-42 and up) airplanes, certificated in all categories.
Compliance required within the next 25 hours time in service after the effective date of this AD, unless already accomplished.
To prevent loss of structural rigidity which could result in hazardous tail flutter and subsequent loss of airplane control, accomplish the following
(a) Modify the horizontal stabilizer to incorporate mass balance weights, improved riveting, addition of access panels, and structural reinforcements to the horizontal stabilizer in accordance with Part 2, "ACCOMPLISHMENT INSTRUCTIONS," of Government Aircraft Factories Nomad Service Bulletin NMD-55-10, Revision 1, dated May 2, 1980, or an FAA- approved equivalent. All AGS pop rivets removed as a result of this modification must be replaced with MS20470AD rivets.NOTE: AGS 2048-420-BS 1/8 inch pop rivets are acceptable in the access panel door as specified in Service Bulletin NMD-55-10, Rev. 1.
(b) Install high strength steel trim tab control brackets, self-aligning control rod ends, and longer control rods in accordance with Part 2, "ACCOMPLISHMENT INSTRUCTIONS," of Government Aircraft Factories Nomad Service Bulletin NMD-55-8, Revision 3, dated September 1, 1980, or an FAA-approved equivalent.
(c) Modify the horizontal stabilizer pivot bracket attachments in accordance with Part 2, "ACCOMPLISHMENT INSTRUCTIONS," of Government Aircraft Factories Nomad Alert Service Bulletin ANMD-55-13, Revision 1, dated August 22, 1980, or an FAA-approved equivalent.
(d) In accordance with FAR 21.197 and 21.199 the airplane may be flown to a location where these modifications can be accomplished.
(e) If an equivalent means of compliance is used in complying with paragraphs (a) through (c) of this AD, that equivalent means must be approved by the Chief, Engineering and Manufacturing District Office, FAA, Pacific-Asia Region, Honolulu, Hawaii.
The manufacturer's specifications and procedures identified and described in this directive are 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 these documents from the manufacturer may obtain copies upon request to Government Aircraft Factories, 226 Lorimer Street, Port Melbourne 3207 Vic., Australia. These documents may be examined at FAA, Pacific-Asia Region, Engineering and Manufacturing District Office, 300 Ala Moana Blvd., Room 7321, Honolulu, Hawaii, and at FAA Headquarters, Room 916, 800 Independence Avenue, S.W., Washington, DC.
Amendment 39-4068 became effective April 2, 1981.
This amendment 39-4388 becomes effective on June 10, 1982.