COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Fokker F100 (F28 Mk 100) Series Aeroplanes
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
AD/F100/43 | Anti Skid Control Box | 4/2001 |
Applicability: | F.28 Mk.0100 series aeroplanes. | |
Requirement: | Either: | |
| a. Modify all Skid control boxes having Part Number (P/N) 6004272-3, | 6004272-4, |
6004272-5 and 6004272-6 in accordance with ABS Corporation Service Bulletin (SB) Fo100-32-83 dated 30 October 2000; or
b. Replace all Skid control boxes having P/N 6004272-3, 6004272-4, 6004272-5 and 6004272-6 with improved units having P/N 6004272-7 in accordance with Fokker Services SB F100-32-123 dated 15 November 2000.
Note: RLD AD 2000-149 (A) refers.
Compliance: Within the next 24 calendar months after the effective date of this Directive.
This Airworthiness Directive becomes effective on 19 April 2001.
Background: During 1999 the Dutch Rijksluchtvaartdienst (RLD) received a report concerning an incident with a Fokker 100, where during an approach, the liftdumpers inadvertently deployed. Preliminary investigation revealed that the outboard wheelspeed signal was induced to ‘high’ by electromagnetic interference (EMI), but the liftdumper arming test did not detect the signal because it was not transmitted until the skid control box was ‘powered up’ on landing gear DOWN selection.
RLD considered that two separate design safety features were not effective. Analysis of the liftdumper system protection against EMI led RLD to mandate certain modifications on the affected aircraft to achieve a configuration, which is significantly less susceptible to EMI on the wheelspeed signals. The RLD issued BLA 1998-100/2 (AD/F100/33) to require modification of the grounding to the shielding of the Wheelspeed Sensor wiring and in addition, the installation of new electrical grounds for the Wheelspeed Sensor Channel of the Anti-Skid Control Box. A modified Skid Control Box was then developed to improve the resistance of the skid control system against unknown sources of EMI, the installation of which was subsequently mandated by BLA 1999-127 (AD/F100/39).
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
ABS Corporation, which supplies the Skid Control Box, has developed another modification, which renders the Skid Control Box even less susceptible to EMI signals during power-up and power-down transients. Since a potentially unsafe condition has been identified that may still exist or develop on other aircraft of the same type design, this Directive requires the modification or replacement of currently installed Skid Control Boxes with improved units.
Prior compliance with AD/F100/39 is not considered compliance with this Directive.
Eugene Paul Holzapfel
Delegate of the Civil Aviation Safety Authority 8 March 2001
The above AD is notified in the Commonwealth of Australia Gazette on 21 March 2001.
Overview
The Civil Aviation Regulations 1998, specifically PART 39 - 105, includes the Civil Aviation Safety Authority Schedule of Airworthiness Directives which address safety concerns related to aircraft. This legislative instrument, F2006B09645, was enacted to ensure the safety of Fokker F100 (F28 Mk 100) series aeroplanes by requiring modifications or replacements to specific components. The Airworthiness Directive AD/F100/43, issued under subregulation 39.1(1) of the Civil Aviation Regulations 1998 by a delegate of the Civil Aviation Safety Authority, aims to correct an unsafe condition related to the anti-skid control box. The directive was introduced in response to a reported incident where the liftdumpers of a Fokker 100 inadvertently deployed due to electromagnetic interference, highlighting the need for improved resistance in the skid control system against such interference. The policy objective is to enhance the safety of aircraft by mandating specific modifications or replacements of parts to mitigate identified risks.
Scope and Application
The Airworthiness Directive (AD) issued under the Civil Aviation Regulations 1998, specifically within PART 39 - 105, applies to Fokker F100 (F28 Mk 100) series aeroplanes. This regulatory measure is aimed at ensuring the safety of the aircraft by addressing a potentially unsafe condition identified in the anti-skid control box. The AD mandates that either a modification of the existing skid control boxes to a less susceptible configuration or a complete replacement with improved units be undertaken. The directive applies to specific skid control boxes identified by their part numbers, and compliance must be achieved within 24 calendar months from the effective date of the directive, which is 19 April 2001. The directive applies nationally within the Commonwealth of Australia, overseen by the Civil Aviation Safety Authority (CASA), and is issued under the authority of a CASA delegate. The AD does not specify any exclusions or exemptions, and compliance with prior directives is not considered as compliance with this directive. The authority to issue such directives extends to the issuance of subordinate instruments, which may further detail the requirements and compliance processes.
Key Provisions
The Civil Aviation Regulations 1998, specifically Part 39, outlines an Airworthiness Directive (AD) for Fokker F100 (F28 Mk 100) series aeroplanes (CAR 1998, Part 39 - 105). This AD, identified as AD/F100/43, mandates either the modification or replacement of the Skid Control Boxes to address identified safety issues (CAR 1998, Part 39 - 105). The directive applies to all F.28 Mk.0100 series aeroplanes. Operators are required to either modify the existing Skid Control Boxes according to ABS Corporation Service Bulletin (SB) Fo100-32-83 dated 30 October 2000, or replace the Skid Control Boxes with improved units as per Fokker Services SB F100-32-123 dated 15 November 2000 (CAR 1998, Part 39 - 105). The directive specifies that the compliance action must be undertaken within 24 calendar months from the effective date of 19 April 2001 (CAR 1998, Part 39 - 105).
Operators of Fokker F100 series aeroplanes must adhere to the AD/F100/43 by either modifying the existing Skid Control Boxes in accordance with the specified service bulletin or replacing them with the improved units as indicated. The directive requires that these actions be completed within 24 months from the date of the directive's effectiveness, which is 19 April 2001. This timeframe ensures that operators have sufficient time to schedule and complete the necessary modifications or replacements to ensure the safety of their aircraft (CAR 1998, Part 39 - 105).
The AD/F100/43 outlines several potential consequences for non-compliance with the specified requirements. While the specific penalties are not detailed in the text, it is implied that failure to comply with the AD may result in significant safety risks and potential regulatory action. Given the critical nature of the modifications, non-compliance could lead to severe consequences, including grounding of the aircraft until the necessary actions are taken, fines, or other regulatory sanctions imposed by the Civil Aviation Safety Authority (CASA). It is important for operators to adhere to the directive to maintain the airworthiness and safety of their aircraft (CAR 1998, Part 39 - 105).
In summary, AD/F100/43 mandates specific actions to be taken on Fokker F100 series aeroplanes to address safety concerns related to the Skid Control Boxes. Operators must either modify the existing Skid Control Boxes or replace them with improved units within 24 months from the directive's effective date of 19 April 2001. Non-compliance may lead to significant safety risks and regulatory consequences, making it imperative for operators to adhere to the directive to ensure the continued airworthiness of their aircraft (CAR 1998, Part 39 - 105).