COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Enstrom F-28 Series Helicopters
AD/ENST 28/29 Rotor Head Hub 12/86 TX
Applicability: All models.
Requirement: 1. Inspect the upper and lower rotor head hub plates in accordance with Enstrom Service Directive Bulletin No. 0072 Paragraph A.
2. Inspect the upper and lower hub plates and other hub components in accordance with Enstrom Service Directive Bulletin No. 0072 Paragraph C.
Compliance: For Para 1: Within 25 hours time in service after 31 October 1986 and thereafter at intervals not exceeding 50 hours time in service.
For Para 2: Within 25 hours time in service after 31 October 1986 for helicopters known to have experienced blade strikes, sudden stoppages or heavy landings.
Background: The manufacturer has received three reports of cracking in the upper and lower hub plates.