Commonwealth legislation

AD/BAe 146/64 - Pitot-Static System - True Airspeed Computer No.2

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legislative instrument

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This AD requires installing shorter pitot and static hoses between the True Airspeed (TAS) Computer No.2 and the drain valve to avoid water traps. It applies to BAe 146 Series 100/200/300 aeroplanes that have TAS2 and a Mode 'S' transponder fitted under the listed BAe Avro modifications (Applicability).

Operators must install SB.34-132-46042A (or Revision 2) by 31 December 1996 if not already done (Requirement; Compliance). Operators bear the cost and scheduling; the directive prescribes the specific service bulletin to be followed.

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AD/BAe 146/64 - Pitot-Static System - True Airspeed Computer No.2

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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British Aerospace BAe 146 Series Aeroplanes

AD/BAe 146/64 Pitot-Static System - True Airspeed Computer No.2

10/96

Applicability: This Directive is applicable to BAe 146 Series 100, 100A, 200, 200A, 300 and 300A aeroplanes equipped with a True Airspeed (TAS) Computer No 2 installed in accordance with BAe Avro modification HCM40160C (SB.34-52-40160C) or HCM40298G and where a Dual Mode `S' Transponder has been installed in accordance with BAe Avro modification HCM30118B (SB.34-90-30118B) or HCM40277A (SB.34-91-40277A).

Note: The requirements of this Directive were incorporated prior to delivery on constructors number E3198 and subsequent aeroplanes, if the modifications referenced above were also incorporated.

Requirement: Install new pitot and static lines between the TAS 2 unit and the drain valve in accordance with either British Aerospace (Commercial Aircraft) Limited, Modification Service Bulletin SB.34-132-46042A dated 24 June 1991 or British Aerospace, Regional Aircraft Limited, Avro International Division, Modification Service Bulletin SB.34-132-46042A Revision 2 dated 1 July 1996.

Note: Both Service Bulletins have been classified as mandatory by the CAA(UK).

Compliance: Unless previously accomplished, then prior to 31 December 1996.

This directive becomes effective on 12 September 1996.

Background: The introduction of the Mode `S' transponder resulted in the TAS 2 unit being moved from its position on the avionics rack. This resulted in the pitot and static flexible hoses between the TAS 2 unit and the drain valve forming an unacceptable water trap. This Directive introduces new shorter flexible hoses designed to minimise the likelihood of water being trapped.

Source text

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

1 AD/BAe 146/64 - Pitot-Static System - True Airspeed Computer No.2