Commonwealth legislation

AD/BAe 146/63 - Pitot-Static System - True Airspeed Computer No.1

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legislative instrument

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An Airworthiness Directive for BAe 146 Series 100/200/300 aeroplanes that have a True Airspeed (TAS) Computer No.1 installed under specified BAe modifications and a Dual Mode 'S' transponder. It requires operators to replace the pitot and static flexible hoses between the TAS 1 unit and the drain valve with shorter hoses per specified British Aerospace service bulletins to remove a water‑trap risk. Compliance was required by 31 December 1996 (effective 12 September 1996).

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AD/BAe 146/63 - Pitot-Static System - True Airspeed Computer No.1

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 146/63 Pitot-Static System - True Airspeed Computer No.1

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 1 installed in accordance with BAe Avro modification HCM40159B (SB.34-69-40159B) or HCM40297G 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 the following constructors number aeroplanes, if the modifications referenced above were also incorporated:

Series 100 and 100A - E1199 and subsequent.

Series 200 and 200A - E1270, E2178, E2188, E2196 and subsequent.

Series 300 and 300A - E3118, E3163, E3165, E3169, E3181, E3185, E3187, E3189,

E3191 and subsequent.

Requirement: Install new pitot and static lines between the TAS 1 unit and the drain valve in accordance with either British Aerospace (Commercial Aircraft) Limited, Modification Service Bulletin SB.34-131-46041A dated 24 June 1991 or British Aerospace, Regional Aircraft Limited, Avro International Division, Modification Service Bulletin SB.34-131-46041A Revision 2 dated 2 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 1 unit being moved from its position on the avionics rack. This resulted in the pitot and static flexible hoses between the TAS 1 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 146/63 - Pitot-Static System - True Airspeed Computer No.1