COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes AD/DHC-8/14 Oxygen Line Chafing 6/91 TX Applicability: All models DHC-8 100 and 300 series aircraft Serial No's 003 through 271. Requirement: 1. Inspect and repair in accordance with Boeing Canada de Havilland Division Alert SB A8-35-5 Rev "A". 2. Tape and wrap in accordance with Boeing Canada de Havilland Division Alert SB A8-35-5 Rev "A". Note: Transport Canada Emergency AD CF-91-97 also refers. Compliance: 1. Prior to 25 April 1991. 2. Within 500 hours time in service after 13 June 1991. Background: There has been an occurrence of an electrical cable chafing an oxygen line beneath the crew compartment floor and rupturing the line. Action in accordance with this AD is necessary to prevent a severe oxygen-fed fire due to possible arcing between electrical feeder cable and crew oxygen line. Note: Boeing Canada advises that all operators have been notified.