AD/HS 125/179 - UAM100 Current Limiters (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.

British Aerospace BAe 125 Series Aeroplanes AD/HS 125/179 UAM100 Current Limiters 8/2006 DM

Applicability: Model HS.125 series 700A and 700B aeroplanes, on which Raytheon Modification 252885 has been incorporated or British Aerospace 125 Service Bulletin SB 24-239-2885 has been accomplished. All Model BAe.125 series 800A (including variants C-29A and U-125), 800B, 1000A and 1000B aeroplanes. All Model Hawker 800 (including variant U-125A) and 1000 aeroplanes together with and Model Hawker 800XP aeroplanes, serial numbers 1 through 258768 inclusive. Requirement: 1. Measure the resistance of the applicable current limiters, part number (P/N) UAM100, in accordance with paragraph 3.A.(2) of the Accomplishment Instructions of Raytheon Service Bulletin SB 24-3793, dated May 2006. The applicable current limiters are listed in Table 1 of the service bulletin. A review of aeroplane maintenance records is acceptable in lieu of the Requirement 1 resistance measurement, if the following criteria can be determined conclusively from that review: (1) The records review determines conclusively the date of the most recent 24-month "F" or "F7" inspection, as applicable, of current limiters and the date of the most recent replacement of current limiters, and that the inspection and replacement were not accomplished between 1 February 2006 and the effective date of this Directive. (2) The records review determines conclusively the picking tag PO of the current limiters, and that the current limiters are not from picking tag PO 4501760749 or PO 4501743706. 2. If the measured resistance of a current limiter is less than 0.46 milliohms or greater than 0.56 milliohms, replace the part with a new part in accordance with SB 24-3793. The new part must not be from picking tag purchase order (PO) 4501760749 or PO 4501743706 and must be the correct resistance in the range of 0.46 milliohms to 0.56 milliohms.