AD/F100/43 - Anti Skid Control Box (Cth)

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.