AD 69-05-01 R2

69-05-01 R2 DE HAVILLAND: Amendment 39-728 as amended by Amendment 39-1175 is further amended by Amendment 39-3824. Applies to de Havilland DHC-6 airplanes certificated in all categories:

(a) Prior to next flight unless accomplished within the last 50 hours time in service, and at intervals thereafter not to exceed 100 hours time in service from the last inspection, visually inspect the control column lower sub-assembly, P/N C3CF39-17 for cracks. Replace cracked parts before further flight with a part of the same part number or with an equivalent part approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

(b) The repetitive inspection interval required by (a) may be increased by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region upon receipt of substantiating data submitted through an FAA maintenance inspector.

(c) Report the results of the initial inspection findings required by this AD to the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region (reporting approved by the Bureau of the Budget under B.O.B. No. 04-R0174).

(d) Cracked parts, P/N C3CF39-17, may be replaced with a new sub-assembly, P/N C3CF39-19, in accordance with De Havilland Modification No. 6/1433 in De Havilland Service Bulletin (S/B) No. 6/180, Revision D, dated April 30, 1976, ACCOMPLISHMENT INSTRUCTION No. 5, or with an equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

(e) The repetitive inspection required by (a) may be discontinued when the lower sub-assembly is replaced by P/N C3CF39-19 in accordance with De Havilland Modification No. 6/1433, or FAA approved equivalent.

Amendment 39-728 effective March 5, 1969, and was effective upon receipt for all recipients of the telegram dated January 31, 1969 which contained this amendment.

Amendment 39-1175 was effective March 23, 1971. This Amendment 39-3824 becomes effective July 7, 1980.