Commonwealth legislation

AD/ENST 28/29 - Rotor Head Hub

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

Operators of Enstrom F-28 helicopters must inspect the upper and lower rotor head hub plates for cracking per the manufacturer’s service directive. An initial check is required soon after the compliance date, with recurring inspections at regular flight-hour intervals and additional checks after blade strikes, hard landings, or sudden engine stoppures.

This responds to reported hub-plate cracks that, if undetected, could lead to rotor failure and catastrophic accidents.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/ENST 28/29 - Rotor Head Hub.

AD/ENST 28/29 - Rotor Head Hub

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
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.

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.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/ENST 28/29 - Rotor Head Hub