Document ID: chunk:federal_register_of_legislation:F2006L01960:body:0:p2
Version: federal_register_of_legislation:F2006L01960
Segment Type: other
Provision Reference: 
Character Range: 2863–5919

Hawker Model Group, Raytheon Aircraft Company, Product Support Department (211), P.O. Box 85, Wichita, Kansas 67201-0085; fax
                (316) 676-3400.  The report must include the results of the Requirement 1 measurements (paragraph (f) of the corresponding FAA AD), the name(s) of the owner and operator of the aeroplane, the aeroplane registration number, the aeroplane serial number and the number of landings and flight hours on the aeroplane.
                4. Current limiter, P/N UAM100, may not be installed on any aeroplane as a replacement part unless the part meets one of the following criteria:
                  a. The picking tag PO of the current limiter can be determined conclusively from a review of aeroplane maintenance records and shown not to be from picking tag PO 4501760749 or PO 4501743706.
                  b. The resistance of the current limiter is measured and determined to be of the correct resistance in accordance with Requirement 1.
             Note:  FAA AD 2006-12-20 Amdt 39-14646 refers.
Compliance:  For Requirement 1 - Either within 30 days or 25 hours time in service, whichever occurs first, after the effective date of this Directive.
             For Requirement 2 - Before further flight after the Requirement 1 measurement.
             For Requirement 3 -
                If the measurements were accomplished after the effective date of this Directive - Within 10 days after the inspection.
                If the measurements were accomplished before the effective date of this Directive - Within 10 days after the effective date of this Directive.
                 For Requirement 4 - As of the effective date of this Directive.
             This Airworthiness Directive becomes effective on 3 July 2006.

Background:  The United States Federal Aviation Administration (FAA) has received several reports indicating that certain current limiters, P/N UAM100, have opened within two to four hours after installation.  The current limiters are the primary bus feed for the PE, PS1 and PS2 busses.  Three of the reports indicated that one or more of the current limiters opened in flight.  Investigation has revealed that the supplier provided parts that did not meet specification and that a specific batch of parts has exhibited the anomaly of opening.  The suspect current limiters were delivered beginning
             1 February 2006 and have picking tag PO 4501760749 or PO 4501743706.  These suspect parts could be installed on any or all three busses.  Loss of all three busses may occur, resulting in loss of all primary direct current electrical power.  This condition, if not corrected, could result in the aeroplane operating only under emergency power.

             This Directive requires measuring the resistance of the current limiters for the PE, PS1 and PS2 busses and, if necessary, replacing a current limiter with a new part. The Directive also requires reporting certain information to the aeroplane manufacturer. Additionally, the Directive allows a records