Commonwealth legislation

AD/DH114/13 Amdt 6 - Centre Section and Wing Spar Boom - Fatigue Life Limitations

In ForceCTH

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Commonwealth

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legislative instrument

Plain English Summary

6/10 complexity

This Airworthiness Directive forces retirement of the DH114 (Heron) centre section and wing lower spar booms after set total flight hours that differ by aircraft Series and by whether specified modifications (Mods 492, 520) are fitted. It applies to all operators of DH114 aircraft and requires record-keeping, part withdrawal and notifying the regulator for short-stage operations. The amendment extends the life-limit graph to higher average cruise weights based on manufacturer fatigue data.

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Direct links to the current provisions in AD/DH114/13 Amdt 6 - Centre Section and Wing Spar Boom - Fatigue Life Limitations.

AD/DH114/13 Amdt 6 - Centre Section and Wing Spar Boom - Fatigue Life Limitations

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
DH114 (Heron) Series Aeroplanes

AD/DH114/13

Amdt 6

Applicability: All models.

Centre Section and Wing Spar Boom - Fatigue Life Limitations

12/89

Requirement: Retire from service the centre section and wing lower spar booms.

Compliance: 1. Series 1 aircraft

(a) Before Modification 492 and 520 \- at or before 4700 hours total time in service.

(b) Centre Section lower spar booms \- after Modification 492 \- at or before 40,000 hours total time in service.

(c) Wing lower spar booms \- after Modification 520 \- at or before 20,000 hours total time in service.

2. Series 2 aircraft (All Series 2 irrespective of power plant)

(a) Before Modification 492 and 520 \- at or before 3500 hours total time in service.

(b) After Modification 492 and 520 - at or before the total time in service as detailed in the following graph. Interpolation between the lines for different average flight times is permissible.

Note 1: The total time in service detailed above for the wing spar boom includes any flying hours prior to the embodiment of Modification 520.

Note 2: The Authority must be notified of any aircraft operating regularly on stages shorter than 1/2 hour duration so that an appropriate retirement life can be determined.

Note 3: Series 2 aircraft fitted with wing external strap modification to STC SA3125WE are exempted from wing lower spar boom retirement.

Note 4: The manufacturer has advised that the wing life cannot be extended beyond the life of the centre section spar boom, i.e. a maximum of 30000 hours for Series 2 aircraft.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source

Background: These life limitations were established in consultation with the aircraft manufacturer, and taking into consideration Australian operating conditions and in-flight fatigue loads measurements. This Amendment follows a query received by the Authority and extends the graph to cover higher average cruise weights. The lives at lower weights remain unchanged.

Source text

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

1 AD/DH114/13 Amdt 6 - Centre Section and Wing Spar Boom - Fatigue Life Limitations

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

DH114 (Heron) Series Aeroplanes

AD/DH114/13

Amdt 6

Applicability: All models.

Centre Section and Wing Spar Boom - Fatigue Life Limitations

12/89

Requirement: Retire from service the centre section and wing lower spar booms.

Compliance: 1. Series 1 aircraft

(a) Before Modification 492 and 520 \- at or before 4700 hours total time in service.

(b) Centre Section lower spar booms \- after Modification 492 \- at or before 40,000 hours total time in service.

(c) Wing lower spar booms \- after Modification 520 \- at or before 20,000 hours total time in service.

2. Series 2 aircraft (All Series 2 irrespective of power plant)

(a) Before Modification 492 and 520 \- at or before 3500 hours total time in service.

(b) After Modification 492 and 520 - at or before the total time in service as detailed in the following graph. Interpolation between the lines for different average flight times is permissible.

Note 1: The total time in service detailed above for the wing spar boom includes any flying hours prior to the embodiment of Modification 520.

Note 2: The Authority must be notified of any aircraft operating regularly on stages shorter than 1/2 hour duration so that an appropriate retirement life can be determined.

Note 3: Series 2 aircraft fitted with wing external strap modification to STC SA3125WE are exempted from wing lower spar boom retirement.

Note 4: The manufacturer has advised that the wing life cannot be extended beyond the life of the centre section spar boom, i.e. a maximum of 30000 hours for Series 2 aircraft.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES