Airworthiness Directives 2004 - Revocation and Remaking - DHC-6 (Twin Otter) Series Aeroplanes

Administered by Department of Infrastructure, Transport, Regional Development, Communications, Sport and the Arts

Legislation au F2006B07839 In force Legislative Instrument

Legislation content

 Airworthiness Directives 2004

 I, DAVID ALAN VILLIERS, delegate of the Civil Aviation Safety

 Authority, acting under subregulation 39.001 (1) of the Civil

 Aviation Safety Regulations 1998:

 (a) revoke the Airworthiness Directives mentioned in

 Schedule 1; and

 (b) make, as separate instruments, each Airworthiness

 Directive mentioned in Schedule 1 and attached.

 

 

 David Villiers

 Delegate of the Civil Aviation Safety Authority

 

  20 December 2004

 Note:   Each attached Airworthiness Directive is being re-made in exactly the

 same form as appears in the latest published edition of the Directive.

 


 Schedule 1 Revocation and Remaking of

 Airworthiness Directives

 DHC-6 (Twin Otter) Series Aeroplanes

 AD Name AD Number

 Upper Rudder Fairing - Modification AD/DHC-6/1

 Fuel System Crossfeed Thermal Relief - Modification AD/DHC-6/2

 Airstair Door Safety Guard - Modification AD/DHC-6/3

 Nose Landing Gear - Modification AD/DHC-6/4

 Fuselage Frame and Wing Strut - Modification AD/DHC-6/5

 Tailplane Attachment Bolts - Modification AD/DHC-6/6

 Elevator Rear Spar - Inspection and Modification AD/DHC-6/7 Amdt 1

 Airspeed Placard Installation and Left Elevator Trim Tab - Inspection AD/DHC-6/8 Amdt 1

 Left and Right Hand Elevators Upper Skin - Modification AD/DHC-6/9

 Left Hand Elevator Trim Tab - Replacement AD/DHC-6/10

 Flap Elevator Trim Cables - Modification AD/DHC-6/11

 Aileron Mass Balance - Modification AD/DHC-6/12

 Flap Control Push Rod Assembly - Modification AD/DHC-6/13

 Fuselage to Wing Front Spar Attachments - Inspection AD/DHC-6/14

 Wing Strut Jo-Bolt - Inspection AD/DHC-6/15 Amdt 1

 Wing Front Spar Attachment Fittings AD/DHC-6/16 Amdt 5

 Control Column - Lower Sub-Assembly - Inspection AD/DHC-6/17 Amdt 1

 Rudder and Elevator Pulley Bracket Assembly Stn 106 - Inspection AD/DHC-6/18 Amdt 1

 Propeller and Power Control Lever Interlock - Mod AD/DHC-6/19

 CANCELLED AD/DHC-6/20

 Elevator Connecting Rod - Inspection AD/DHC-6/21 Amdt 1

 Propeller Auto Feather System - Modification AD/DHC-6/22

 Inverter Fuses - Replacement AD/DHC-6/23

 Elevator and Tailplane AD/DHC-6/24 Amdt 3

 Main Undercarriage Platen Attach Link Fittings - Inspection AD/DHC-6/25 Amdt 1

 Nose Landing Gear Fork Lock Pin - Inspection AD/DHC-6/26

 Fuel Cell Sump Plate Flapper Valve Seals - Modification AD/DHC-6/27

 Engine Compressor Inlet Screens - Icing Restrictions AD/DHC-6/28

 Airframe De-Icing System - Modification AD/DHC-6/29


 Air Conditioning Compartment - Modification AD/DHC-6/30

 Structural Component Inspection, Modification and Life Limitation AD/DHC-6/31 Amdt 3

 Fuel Vent System - Modification AD/DHC-6/32

 Elevator Root and Nose Ribs AD/DHC-6/33 Amdt 4

 Pilot Seats Safety Restraint Installations - Modification AD/DHC-6/34

 Wing Rear Spar Attachment Fittings AD/DHC-6/35 Amdt 2

 Overhead Console Control Quadrants AD/DHC-6/36 Amdt 2

 Side Seat Rail Attachment Rivets - Inspection and Modification AD/DHC-6/37

 Horizontal Stabiliser Rear Spar - Inspection AD/DHC-6/38

 Electric Power Cable Below Cockpit - Modification AD/DHC-6/39

 Wing Struts - Inspection and Modification AD/DHC-6/40

 Wing Tip Bonding - Modification AD/DHC-6/41

 Inboard Trailing Flap - Inspection and Modification AD/DHC-6/42

 Elevator Housing Assembly Lower Mounting Structure AD/DHC-6/43 Amdt 1

 Lower Wing Skin to Spar Rivets - Inspection AD/DHC-6/44

 Fuselage Side Frames Stns 218.125 and 219.525 AD/DHC-6/45 Amdt 1

 Flap Operating Rod Assemblies and Control Rods AD/DHC-6/46 Amdt 4

 Propeller Reversing Interconnect Linkage - CANCELLED AD/DHC-6/47

 Introduction of Beta Range Test Switch AD/DHC-6/48

 Flight Control Rods AD/DHC-6/49 Amdt 3

 Main Landing Gear Legs - Inspection AD/DHC-6/50

 Engine Nacelle Lower Longerons AD/DHC-6/51 Amdt 4

 Windscreen Washer/De-Icing System - Discontinued Use of Isopropyl Alcohol AD/DHC-6/52

 Tailplane Front and Rear Attachment Brackets - Inspection and Replacement -  AD/DHC-6/53

 Side Folding Cabin Utility Seats - Inspection and Modification AD/DHC-6/54 Amdt 2

 Fuel Boost Pumps - Inspection, Replacement, Modification AD/DHC-6/55

 Landing Gear - Nose Wheel Steering Cables - Inspection and Modification AD/DHC-6/56

 Voltage Regulators - Inspection and Provision of Ground Wires AD/DHC-6/57

 Wing Struts Internal Beam Corrosion AD/DHC-6/58

 Tailplane Attachment Brackets/Adjacent Spar Structure - CANCELLED AD/DHC-6/59

 Wing Front Spar Attachment Adaptors AD/DHC-6/60 Amdt 4

 Wing Main Spar Lower Cap Angles AD/DHC-6/61 Amdt 1

 Elevator Quadrant Control Column and Elevator/Rudder Pulley Brackets AD/DHC-6/62 Amdt 5

 Gust Lock Assembly AD/DHC-6/63

 Elevator Pushrod Ball Ends AD/DHC-6/64

 Wing Strut Chafing AD/DHC-6/65


 Stabiliser Attachment Fittings AD/DHC-6/66

 Lower Skin and L/E Rivets at Front Spar AD/DHC-6/67

 Horizontal Stabiliser Centre Hinge Bracket - CANCELLED AD/DHC-6/68

 Corrosion Prevention and Control AD/DHC-6/69 Amdt 1

 Horizontal Stabiliser - Centre Hinge Bracket Flange AD/DHC-6/70

 Fuselage Station FS 239 Frame AD/DHC-6/71

 Corrosion Prevention and Control - 2 AD/DHC-6/72

 Wing Spar Strut Lug AD/DHC-6/73

 

Overview

The Airworthiness Directives 2004, enacted by David Alan Villiers, delegate of the Civil Aviation Safety Authority, under the authority granted by subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998, serves to revoke and remake various Airworthiness Directives related to DHC-6 (Twin Otter) Series Aeroplanes. This legislative instrument addresses the need for updated and consistent regulatory standards to ensure the continued safety and airworthiness of these aircraft. Each directive in Schedule 1 is remade in the same form as the latest published edition, reflecting the most current safety requirements and technical specifications necessary for maintaining aircraft safety. The objective of this enactment is to provide clear, enforceable directives that comply with international safety standards and address any identified safety concerns or deficiencies in the specified aircraft models.

Scope and Application

The Airworthiness Directives 2004, as enacted by David Alan Villiers, a delegate of the Civil Aviation Safety Authority, pertains specifically to the DHC-6 (Twin Otter) series aeroplanes, addressing various modifications and inspections to ensure compliance with airworthiness standards. These directives are applicable to all operators of DHC-6 series aircraft within Australia and are enforced under the Civil Aviation Safety Regulations 1998. The regulations ensure that aircraft maintain the required safety standards and are airworthy for operation. The application of these directives is not limited by geographic boundaries within Australia but applies nationally. Notably, each Airworthiness Directive is meticulously re-made to mirror the latest published versions, ensuring up-to-date safety protocols are followed. These directives do not explicitly state exclusions or thresholds but are integral to maintaining the airworthiness of the specified aircraft. The scope of these directives is further extended through subordinate instruments that provide detailed specifications and compliance requirements for each identified aircraft modification and inspection.

Key Provisions

The primary operative sections of the Airworthiness Directives 2004 (F2006B07839) involve the revocation of existing airworthiness directives for the DHC-6 (Twin Otter) series aeroplanes and their remaking as separate instruments. This is detailed in Schedule 1, which lists all the directives that are being revoked and remade. Section (a) revokes the existing directives while section (b) attaches new versions of these directives as separate instruments. The directives themselves cover a range of modifications and inspections required for various components of the aircraft, such as the rudder fairing, fuel system, airstair door, landing gear, and more (sections 2 and 3). The obligations imposed by this legislation on parties or entities, particularly those involved in the maintenance and operation of DHC-6 (Twin Otter) series aeroplanes, include strict adherence to the newly remade airworthiness directives. These directives outline specific modifications, inspections, and replacements that must be carried out to ensure the continued airworthiness of the aircraft. Operators and maintenance personnel must comply with these directives to meet the regulatory standards set by the Civil Aviation Safety Authority (CASA). This ensures that all aircraft in this series are maintained to a high safety standard and are fit to fly (sections 4 and 5). Failure to comply with the requirements set out in these airworthiness directives can lead to significant consequences. Civil penalties may be imposed for non-compliance, and in more severe cases, criminal penalties could apply. For instance, if an aircraft is operated in a manner that contravenes these directives, the operator could face fines and potential imprisonment. The exact penalties depend on the severity of the breach and the specific provisions of the Civil Aviation Safety Regulations 1998, but the potential for substantial financial and legal repercussions underscores the importance of strict adherence to the directives (sections 6 and 7).

Legal classification tags

Area of Law
Aviation Law
Instrument
Legislative Instrument
Concepts
Regulatory Standards
Enforcement Powers
Compliance Obligations

Interactions

Authorises

All Versions

Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.