STC SA1-607

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA1-607 This certificate issued to: BFGoodrich De-Icing Systems 1555 Corporate Woods Pkwy.

Uniontown, OH 44685 Part 3 of the CiVi I Air Regulalions: (See Type Certificate Data Sheet 6A1 for complete Original Product -Type Cerificate Number 6A1 certification basis).

Make Twin Commander Model: 500-A Description of Type Design Change:

Install Electrothermal Propeller De-Icing System in accordance with Installation Manuals (BFG Reports) 61-703, dated 3/15/61 and 59-728, dated 12/31/59.

Limitations and Conditions: Airplane Flight Manual Supplement No. 1 (BFG Report 61-719) dated 5/1/61, is required on board for operation.

2. This installation is applicable only to aircraft which have generator capacity sufficient to allow the addition of 12 amps for continuous prop de-icing. This is to be determined by electrical load analysis in accordance with CAM 18, Section 18, 30-12(1).

Compatibility of this design change with previously approved i fitzone desting ete mined be the install remain in effed until surrendered, suspended, revoked, or a termination date is sherwise established by the Administrater of the Federal Aviation Administration .

Date of Application: JUly 6, 1961 Jule wissued: March 1, 1996 Date of Issuance: August 23, 1961 Date Amended:

EDERAL AVIATIO By Direction of the Administrator Charles L. Smalley, Mattager<) Systems & Flight Test Branch Chicago Aircraft Certification Office (Title) 47 FAA FORM 8110-2 (10-68)