1AD/SWSA226/81 - Generator System Rework

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Fairchild (Swearingen) SA226 and SA227 Series Aeroplanes

AD/SWSA226/81 Generator System Rework 10/97

Applicability: SA226-T Serial Nos: T201 through T275 and T277 through T291 inclusive. SA226-T(B) Serial Nos: T(B)276 and T(B)292 through T(B)417 inclusive. SA226-AT Serial Nos: AT001 through AT074 inclusive.

SA226-TC Serial Nos: TC201 through TC419 inclusive. SA227-TT Serial Nos: TT421 through TT541 inclusive. SA227-AT Serial Nos: AT423 through AT631 inclusive.

SA227-AC Serial Nos: AC406, AC415, AC416, AC420 through AC705 inclusive and AC707 through AC733 inclusive.

Requirement: To prevent failure of both generators during critical phases of flight (such as night operation or while in icing conditions), which could result in loss of control of the aircraft, accomplish the following:

(a) For the model and serial number aircraft presented below, replace the existing generator fault transformer wiring with new dual conductor shielded wire in accordance with Fairchild Service Bulletin (SB) 226-24-027, Issued: 19 May, 1988, Revised: 22 February, 1989, or Fairchild SB 227-24-008, Issued: 18 March 1988, Revised: 22 February 1989, as applicable.

(1) Model SA226-T aircraft, serial numbers T201 through T275 inclusive and T277 through T291 inclusive;

Model SA226-T(B) aircraft, serial numbers T(B)276 and T(B)292 through T(B)417 inclusive;

Model SA226-AT aircraft, serial numbers AT001 through AT074 inclusive; and

Model SA226-TC aircraft, serial numbers TC201 through TC419 inclusive.

(2) Model SA227-TT aircraft, serial numbers TT421 through TT541 inclusive;

Model SA227-AT aircraft, serial numbers AT423 through AT631 inclusive; and

Model SA227-AC aircraft, serial numbers AC406, AC415, AC416, and AC420 through AC683 inclusive.

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

(b) For the model and serial number aircraft presented below, rewire the electrical power generation system to reduce the possibility of 325-amp current limiter failure in accordance with Fairchild SB 226-24-023, Issued: 25 October, 1985, Revised: 23 January, 1989, or Fairchild SB 227-24-005, Issued: 25 October, 1985, Revised: 23 January, 1989, as applicable.

(1) Model SA226-T aircraft, serial numbers T249 through T275 inclusive and T277 through T291 inclusive;

Model SA226-T(B) aircraft, serial numbers T(B)276 and T(B)292 through T(B)417 inclusive;

Model SA226-AT aircraft, serial numbers ATO25 through ATO74 inclusive; and