AD/F100/44 - No. 1 Pitot Tube AC Sensing Circuit (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 39.1 (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.

Fokker F100 (F28 Mk 100) Series Aeroplanes

AD/F100/44 No 1 Pitot Tube AC Sensing Circuit 7/2001

Applicability: All Model F.28 Mk.0070 and Mk.0100 aeroplanes with either Fokker Service Bulletin (SB) F100-30-019 or SB F100-30-020 embodied.

Requirement: 1. Perform an operational check of the No 1 Pitot Tube Heating System, to establish whether both tube and mast heaters are serviceable, in accordance with Part 1 of the Accomplishment Instructions of Fokker SB F100-30-25 Revision 1 dated 14 March 2001.

2. If, as a result of the Requirement 1 operation check, either heating element is found to be inoperative, replace the defective Pitot Tube with a serviceable unit of the same part number.

3. Modify the No 1 Pitot Tube Alternating Current Sensing Circuit in accordance with Part 2, 3, 4, 5 or 6, as applicable, of the Accomplishment Instructions of Fokker SB F100-30-25 Revision 1.

Note: RLD AD 2001-041 (A) refers

Compliance: 1. Within three calendar months after the effective date of this Directive and thereafter at intervals not to exceed 12 months until the Requirement 3 modification is incorporated.