AD 73-08-02

73-08-02 SWEARINGEN : Amendment 39-1615 as amended by Amendment 39-1621. Applies to Swearingen Models SA226T and SA226AT aircraft, Serial Numbers T201 through 224, and Serial Numbers AT001 through 009 respectively, certificated in all categories.

Compliance required as indicated.

To prevent operation in icing conditions with an unapproved oil cooler inlet scoop which may not provide adequate ice protection, prior to further flight after receipt of this message, accomplish the following:

1. Inspect the Oil Cooler Air Inlet Assembly to determine if the Assembly, P/N 27-63019-1, is installed. The 27-63019-1 Assembly can be identified externally since the leading edge of the oil cooler scoop will be wrapped around the oil tube on such units.

2. If the 27-63019-1 Assembly is installed, modify the "Approved Type of Operation" placard as follows:

a. Obscure from view the words "AND KNOWN ICING."b. Install a permanent type placard in full view of the pilot as near as possible to the Approved Type of Operation placard, worded as follows: "FLIGHT INTO KNOWN ICING CONDITIONS IS PROHIBITED." The owner or operator may make and use a placard containing the above words or contact Swearingen Aviation Corporation, P. O. Box 32486, San Antonio, Texas, 78284, to obtain a placard containing the appropriate wording. Letters must be at least one-eighth inch in height.

3. No action need be taken on aircraft not having the oil cooler assembly, P/N 27-63019-1.

4. On aircraft modified in accordance with Swearingen Aviation Corporation Service Kit No. 71K10-3036, the placard required by paragraph 2.b. above may be deleted and the words "AND KNOWN ICING" in paragraph 2.a. above may be uncovered.

Amendment 39-1615 was effective April 5, 1973, and was effective upon receipt for all recipients of the message dated March21, 1973, which contained this amendment.

This Amendment 39-1621 becomes effective April 12, 1973.