AD/F100/85 Flight Controls Elevator Booster Control Unit (Cth)
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 39.001(1) of CASR 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.
Fokker F100 (F28 Mk 100) Series Aeroplanes
| AD/F100/85 | Flight Controls - Elevator Booster Control Unit | 11/2007 |
Applicability: | F28 Mark 0070 and Mark 0100 aircraft, serial numbers 11244 through 11585 inclusive, if Goodrich Part Number (P/N) 23400-3B or P/N 23400-7 Elevator Booster Control Units in pre-SB 23400-27-27 configuration are installed. |
Requirement: | 1. Perform a one-time inspection of the Elevator Booster Control Unit as defined in Part 1 of the Accomplishment Instructions of Fokker Service Bulletin 2. Replace the Elevator Booster Control Unit with a P/N 23400-3B or P/N 23400-7 unit that has been modified in accordance with Goodrich CSB 23400-27-27. 3. Replace all remaining unmodified Elevator Booster Control Units P/N 23400-3B and P/N 23400-7 with units modified in accordance with Goodrich CSB 4. Do not install a spare Goodrich P/N 23400-3B or P/N 23400-7 Elevator Booster Control Unit on any aircraft, unless it has been modified in accordance with Goodrich CSB 23400-27-27. Note: EASA AD 2007-0228 dated 15 August 2007 refers. |
Compliance: | 1. Within 12 months after the effective date of this AD. 2. Depending on the result of the inspection conducted in Requirement 1 of this AD, within the time interval as indicated in Table 2 on page 8 of the referenced Fokker SB. 3. Within 5 years after the effective date of this AD. 4. From 29 August 2012. |
| This Airworthiness Directive becomes effective on 25 October 2007. |
Background: | Excessive wear and tear of the backlash remover mechanism has been found several times. The wear and tear may result in a (partly) blocked operation of the elevator system in the normal (hydraulic) mode. Together with the manufacturer of this equipment (Goodrich) it has been decided to modify the Elevator Booster Control Unit in accordance with Goodrich Component Service Bulletin (CSB) 23400-27-27. In order to detect and correct an excessively worn backlash remover mechanism, this AD requires a one-time inspection and eventual replacement of the affected Elevator Booster Control Units. |
Charles Lenarcic
Delegate of the Civil Aviation Safety Authority
10 September 2007
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