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