Commonwealth legislation

AD/HS 748/31 Amdt 1 - Gust Lock Baulking Actuator

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires all British Aerospace (Hawker Siddeley) HS 748 aeroplanes to have their elevator gust‑lock system modified, inspected regularly, and the modification reworked to stop the gust‑lock re‑engaging unintentionally. It affects HS748 operators and maintenance providers, who must pay for and schedule the modification, recurring baulk‑lever inspections and the mandated rework; the AD sets specific deadlines and cites BAe service bulletin revisions and a UK AD as the instructional basis (Background; Requirements).

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Current sections

Direct links to the current provisions in AD/HS 748/31 Amdt 1 - Gust Lock Baulking Actuator.

AD/HS 748/31 Amdt 1 - Gust Lock Baulking Actuator

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AIRWORTHINESS DIRECTIVE

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For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/HS 748/31 and issues the following 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.

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British Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes

AD/HS 748/31

Amdt 1

Gust Lock Baulking Actuator 1/2004

Applicability: All HS748 aeroplanes.

Requirement: 1. Modify the aeroplane’s gust lock system (Modification No 7673) in accordance with Parts 1 and 2 of BAe Systems Service Bulletin (SB) HS748-27-135 Revision 1 dated 10 December 2002.

2. Conduct an inspection of the baulk lever in accordance with Appendix 2 of SB HS748-27-135 Revision 1 or Revision 2 dated 2 October 2003.

3. Rework the Requirement 1 modification to the gust lock system in accordance with SB HS748-27-135 Revision 2.

Note 1: CAA(UK) AD 003-12-2002 refers.

Compliance: For Requirement 1 - Remains unchanged as ‘Before 1 September 2003’.

For Requirement 2 - Remains unchanged as ‘Initially within 750 hours time in service (TIS) or 240 days, whichever occurs first, after the installation of the baulking actuator and thereafter, repeat the inspection at intervals of 750 hours TIS or 240 days, whichever occurs first’.

Note 2: 750 hours TIS or 240 days is the ‘C’ Check interval.

For Requirement 3 - Before 29 February 2004.

This Amendment becomes effective on 22 January 2004.

Background: BAe advises that there have been two incidents where re-engagement of the elevator gust-lock may have caused a flying control restriction. The original issue of this Directive required the installation of a rotary actuator at the elevator gust lock that will baulk the mechanism after gust-lock withdrawal so that an uncommanded re- engagement cannot occur.

This Amendment revises the wiring of the gust lock actuator to ensure correct operation.

British Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes

AD/HS 748/31 Amdt 1 (continued)

The original issue of this Airworthiness Directive became effective on 20 March 2003.

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Jim Coyne

Delegate of the Civil Aviation Safety Authority 4 December 2003

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The above AD is notified in the Commonwealth of Australia Gazette on 24 December 2003.

Source text

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

1 AD/HS 748/31 Amdt 1 - Gust Lock Baulking Actuator

AIRWORTHINESS DIRECTIVE

British Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes

AD/HS 748/31

Amdt 1

Gust Lock Baulking Actuator 1/2004

Applicability: All HS748 aeroplanes.

Requirement: 1. Modify the aeroplane’s gust lock system (Modification No 7673) in accordance with Parts 1 and 2 of BAe Systems Service Bulletin (SB) HS748-27-135 Revision 1 dated 10 December 2002.

2. Conduct an inspection of the baulk lever in accordance with Appendix 2 of SB HS748-27-135 Revision 1 or Revision 2 dated 2 October 2003.

3. Rework the Requirement 1 modification to the gust lock system in accordance with SB HS748-27-135 Revision 2.

Note 1: CAA(UK) AD 003-12-2002 refers.

Compliance: For Requirement 1 - Remains unchanged as ‘Before 1 September 2003’.

Note 2: 750 hours TIS or 240 days is the ‘C’ Check interval.

For Requirement 3 - Before 29 February 2004.

This Amendment becomes effective on 22 January 2004.

This Amendment revises the wiring of the gust lock actuator to ensure correct operation.