AD/SWSA226/81 - Generator System Rework

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Legislation au F2006B07224 In force Legislative Instrument

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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

 

Model SA226-TC aircraft, serial numbers TC209 through TC419 inclusive.

 

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

 

Model SA227-AT aircraft, serial numbers AT423 through AT591 inclusive; and

 

Model SA227-AC aircraft, serial numbers AC420 through AC594 inclusive.

 

(c)     For the model and serial number aircraft presented below modify the voltage regulator access panel and install a connector in the wire bundle in accordance with Fairchild SB 226-24-026, Issued: May 27, 1987:

 

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

 

Model SA226-TC aircraft, serial numbers TC209 through TC419 inclusive,

 

(d)     For the model and serial number aircraft presented below install new voltage regulators, reroute certain wires, and replace the entire voltage regulator panel assembly in accordance with Fairchild SB 24-018, Issued: October 22, 1980, Revised: January 7, 1981:

 

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)347 inclusive;

 

Model SA226-AT aircraft, serial numbers ATO01 through ATO74 inclusive; and

 

Model SA226-TC aircraft, serial numbers TC201 through TC348.

 

(e)     For the model and serial number aircraft presented below, modify the direct current (DC) generator control system so that it will operate off its respective generator output in accordance with Fairchild SB 22624-031, dated

July 27, 1989, or Fairchild SB 227-24-012, Issued: May 4, 1989; Revised: July 27, 1989, as applicable. This includes removing field current and reset resistors, removing the reset and generator relays and associated diodes, installing a 10-amp generator control circuit breaker to the left-hand and right- hand essential bus panels, and replacing the 10-amp generator control circuit breakers in the left-hand and right-hand wheelwells with 15-amp circuit breakers that are wired in series with the generator control circuit breakers.

 

(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

 

Model SA226-TC aircraft, serial numbers TC209 through TC419 inclusive.

 

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

 

Model SA227-AT aircraft, serial numbers AT423 through AT695 inclusive; and

 

Model SA227-AC aircraft, serial numbers AC406, AC4 1 5, AC416, AC420 through AC556 inclusive, AC558 through AC705 inclusive, and AC707 through AC733 inclusive.

 

Note: FAA AD 97-11-13 Amdt 39-10042 refers.

 

Compliance: Unless already accomplished to be incorporated within the next 2,000 hours time-in- service after the effective date of this AD.

 

This airworthiness directive becomes effective on 11September 1997.

 

Background: FAA has received reports of both generators going off-line during flight on three of the affected aircraft. The actions specified by this AD are intended to prevent failure of both generators during critical phases of flight (such as night operations or in icing conditions), which may result in the loss of control of the aircraft.

Overview

The Civil Aviation Regulations 1998 (Cth) were enacted to regulate and ensure the safety of civil aviation in Australia. The regulations aim to maintain a high standard of safety in the aviation industry, addressing issues such as airworthiness, pilot licensing, and aircraft maintenance. The Civil Aviation Safety Authority (CASA) is responsible for enforcing these regulations and issuing airworthiness directives (ADs) to address specific safety concerns. AD/SWSA226/81 is an AD issued by CASA to address a safety issue related to the generator system of Fairchild (Swearingen) SA226 and SA227 Series Aeroplanes, which may lead to the failure of both generators during critical phases of flight, potentially resulting in a loss of control of the aircraft. The policy objective of this AD is to ensure the safety of the affected aircraft by requiring the rework of the generator system in accordance with specified service bulletins. The AD/SWSA226/81 applies to specific models and serial numbers of Fairchild (Swearingen) SA226 and SA227 Series Aeroplanes and requires the rework of the generator system to prevent failure of both generators during critical phases of flight. CASA has identified that failure of both generators during flight may result in the loss of control of the aircraft and has issued this AD to address the safety concern. The AD requires the replacement of existing generator fault transformer wiring, rewiring of the electrical power generation system, modification of the voltage regulator access panel, installation of new voltage regulators, and modification of the direct current generator control system. Compliance with this AD must be incorporated within the next 2,000 hours of time-in-service after the effective date of the AD. The AD became effective on 11 September 1997.

Scope and Application

The Fairchild (Swearingen) SA226 and SA227 Series Aeroplanes Generator System Rework Airworthiness Directive (AD) applies specifically to certain serial numbers of SA226 and SA227 aircraft, detailing required modifications to the generator systems to prevent failures during critical phases of flight. The AD mandates that owners and operators of SA226-T, SA226-T(B), SA226-AT, SA226-TC, SA227-TT, SA227-AT, and SA227-AC models, with specific serial numbers, must comply with the outlined requirements to replace or modify various components of the generator systems. The directive applies on a national level within Australia, governed under the Civil Aviation Regulations 1998. The directive is effective from 11 September 1997, and compliance must be achieved within the next 2,000 hours of time-in-service after the directive's effective date. The AD does not explicitly state exclusions or exemptions but focuses on targeted aircraft to ensure safety improvements. Subordinate instruments may extend or further detail the application of the AD as necessary.

Key Provisions

The legislation F2006B07224, specifically the Civil Aviation Safety Authority's Airworthiness Directive (AD) SWSA226/81, sets forth requirements for specific Fairchild Swearingen SA226 and SA227 series aeroplanes to address potential generator system failures that could critically affect flight safety. Section 1 of the AD specifies the models and serial numbers of the aircraft that must undergo specific rework to the generator system to prevent dual generator failures during critical flight phases, such as night operations or in icing conditions. This includes replacing or modifying components such as generator fault transformers, rewiring the electrical power generation system, modifying voltage regulator access panels, and replacing voltage regulators, among other specified tasks. The AD imposes several obligations on the operators or owners of the affected aircraft. They must ensure that the specified rework is performed on the aircraft within the next 2,000 hours of time-in-service after the AD's effective date of 11 September 1997. Compliance with these directives is mandatory, and failure to adhere to the requirements can result in serious safety implications, including the potential for loss of control of the aircraft during critical phases of flight. Breach of the obligations outlined in the AD can lead to civil and criminal consequences. The Civil Aviation Safety Authority (CASA) has the authority to take action against operators or owners who fail to comply with the AD. The potential penalties for non-compliance can include fines, suspension or revocation of airworthiness certificates, and other enforcement actions. The specific penalties are determined by the severity of the breach and are subject to the Civil Aviation Act 1988 and other relevant legislation. The AD underscores the critical importance of adhering to these safety directives to maintain the airworthiness and safety of the specified aircraft models.

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Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.