COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Instruments and Automatic Pilots AD/INST/32 Altimeters 5/86 Applicability: United Instruments Inc altimeters 5934 series with the following serial numbers: 6C461 thru 6C999 7C000 thru 7C999 8C000 thru 8C999 9C000 thru 9C999 0D000 thru 0D999 1D000 thru 1D999 2D000 thru 2D869 manufactured between 1 February 1985 and 28 February 1986 and not identified as modified by a 6mm yellow dot on the lower half of the rear case and the letter "M" stamped on the data plate just before the word "altimeter". Requirement: Action in accordance with United Instruments Inc SB No. 2. Note: FAA AD 86-05-02 refers. Compliance: Prior to issue of the next Maintenance Release after 31 May 1986. Note: Corrective action MAY be carried out in Australia by an approved workshop and the altimeter appropriately identified. Background: Several reports have been received stating that a slight outward pull on the barometric scale setting knob may disconnect the millibar scale from the altitude indication pointers.