AD 80-15-07

80-15-07 SHORT BROTHERS LIMITED: Amendment 39-3846. Applies to Model SD3-30 series airplanes, certificated in any category, serial numbers SH 3000 to SH 3027 inclusive.

Compliance required as indicated.

To prevent loss of fuel flow to an engine due to failure of a fuel system gravity feed check valve, comply with following, unless already accomplished.

(a) Within 100 hours time in service after the effective date of this AD, or before the accumulation of 1300 hours total time in service, whichever occurs later, and thereafter in accordance with paragraph (b) of this AD, inspect and service the fuel system aft gravity feed check valve associated with fuel cell number 4 in accordance with paragraph 2, "ACCOMPLISHMENT INSTRUCTIONS," of Short Brothers Limited Service Bulletin No. SD 3-28-12, revision 1, dated February 1, 1980, (hereinafter referred to as the service bulletin) or an FAA-approved equivalent.

(b) At intervals not to exceed 1200 hours total time in service since the last inspection, accomplish the inspection and servicing required in paragraph (a) of this AD.

(c) The inspection interval required in paragraph (b) of this AD may be increased to 2400 hours upon the installation of a new or serviceable gravity feed check valve, P/N 984109/F.

(d) Before the accumulation of 2400 hours total time in service and thereafter at intervals not to exceed 2400 hours time in service since the last inspection, inspect and service the fuel system aft gravity feed check valves associated with fuel cells numbers 1, 2 and 3, and the forward valve on cell number 4 in accordance with paragraph 2, "ACCOMPLISHMENT INSTRUCTIONS," of Short Brothers Limited Service Bulletin No. SD 3-28-12, revision 1, dated February 1, 1980, or an FAA-approved equivalent.

NOTE: Short Brothers Limited Service Bulletin No. SD 3-28-13, dated December 19, 1979, refers to this subject.

(e) Airplanes may be flown in accordance with FAR 21.197 and 21.199 to a basewhere the inspections and parts replacement required in this AD can be accomplished.

(f) Upon request of an operator, the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Office, c/o American Embassy, Brussels, Belgium, may adjust the inspection intervals specified in this AD or approve equivalent means of compliance with this AD provided such requests are made through the assigned FAA maintenance inspector and the request contains substantiating data to justify the request for that operator.

This amendment becomes effective July 28, 1980.