Commonwealth legislation

AD/ENST 28/38 - Main Rotor Hub Plates

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This Airworthiness Directive requires owners/operators of Enstrom TH-28 and 480 helicopters fitted with main rotor upper hub plate PN 28-14280-1 or lower hub plate PN 28-14281-1 to create service-history records and retire each plate at 5,000 flight hours, replacing them with specified successor part numbers matched to the helicopter’s damper PN.

Issued under CASR subreg 39.1(1), it also requires updating maintenance-manual life limits; operators bear the costs of inspections, recordkeeping and replacement, with initial compliance due within 30 days of 18 March 2004.

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 28/38 - Main Rotor Hub Plates.

AIRWORTHINESS DIRECTIVE

View image in the official source

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

View image in the official source

Enstrom F-28 Series Helicopters

AD/ENST 28/38 Main Rotor Hub Plates 3/20

AD/ENST 28/38 Main Rotor Hub Plates 3/2004

Applicability: Model TH-28 and 480 helicopters, with main rotor upper hub plate part number 28- 14280-1, and main rotor lower hub plate part number 28-14281-1, installed.

Requirement: 1. Create a component history card or equivalent record for the upper hub plate part number 28-14280-1, and the lower hub plate part number 28-14281-1, and determine the total hours time in service. Thereafter, record the hours time in service for each hub plate and replace each hub plate upon accumulation of 5,000 hours time in service as follows:

Install hub plates, part number 28-14280-3 and 28-14281-3, on helicopters with main rotor damper part number 28-14375-8 installed.

b. Install hub plates, part number 28-14280-5 and 28-14281-5, on helicopters with main rotor damper part number 28-14375-10 installed.

2. This Directive revises the Limitations section of the applicable maintenance manual by establishing a life limit of 5,000 hours time in service for the upper hub plate part number 28-14280-1, and for the lower hub plate part number 28- 14281-1.

Note: FAA AD 2001-25-02 Amdt 39-12554 refers.

Compliance: 1. Within 30 days after 18 March 2004, unless already accomplished.

From the effective date of this Directive.

This Airworthiness Directive becomes effective on 18 March 2004.

Source text

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

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE