78-01-09 R2 SHORT BROTHERS LIMITED: Amendment 39-3114 as amended by Amendment 39-3167 is further amended by Amendment 39-3869. Applies to Model SD3-30 airplanes, Serial Numbers SH 3002, SH 3004 through SH 3007, inclusive, and SH 3009 through SH 3011, inclusive, certificated in all categories.
To prevent inability to inflate de-icing boots of pneumatic deicing system on the empennage caused by water freezing in system plumbing, accomplish the following:
(a) Prior to each flight in which the airplane may be subject to known icing conditions, manually drain the water that collects in the plumbing of the pneumatic deicing system to the empennage in accordance with Section 2 entitled "Accomplishment Instructions" of Short Brothers, Ltd., Alert Service Bulletin SD3-30-A04, Revision 1, dated February 15, 1979, or an FAA-approved equivalent, except that the water need only be drained once each day. In addition, place a placard in full view of the pilot in the cockpit stating: "The deicing system must be drained once each day prior to flight into known icing conditions."
NOTE. For the requirements regarding the listing of compliance and method of compliance with this AD in the airplane's permanent maintenance record, see FAR 91.173.
(b) Compliance with paragraph (a) of this AD may be terminated upon incorporation of automatic water drainage provisions in accordance with Short Brothers, Ltd., Modification Service Bulletin SD3-30-04 (modification 5332), Revision 2, dated February 15, 1979, or an FAA-approved equivalent.
Amendment 39-3114 became effective January 19, 1978.
Amendment 39-3167 became effective April 14, 1978.
This Amendment 39-3869 becomes effective August 18, 1980.