COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Auxiliary Power Units AD/APU/14 TSCP700 First Stage LPC Disc 3/98 Applicability: AlliedSignal Inc. TSCP700 series auxiliary power units (APUs) incorporating stage one low pressure compressor (LPC1) disc, P/No 3606429-1. Requirement: Remove from service affected TSCP700 LPC1 discs in accordance with AlliedSignal Service Bulletin TSCP700-49-7266. Note: FAA AD 97-19-18 also refers Compliance: As specified in the requirement document, with a revised effective date of 26 February 1998. This airworthiness directive becomes effective 26 February 1998. Background: The manufacturer has advised there has been LPC1 disc rim separation events. Subsequent investigation has resulted in a reduction in the LPC1 life limit.