AD/HS 125/164 - Pitot/Static and Stall Vent Drain Valves (Cth)

British Aerospace BAe 125 Series Aeroplanes

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 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.

AD/HS 125/164 Pitot/Static and Stall Vent Drain Valves 1/2001

Applicability: Model DH.125, Model HS.125, Model BH.125, Model BAe.125, Model Hawker 800, Model Hawker 800XP, and Model Hawker 1000 series aeroplanes; as listed in Raytheon Aircraft Service Bulletin SB 34-3207, dated August 1999; excluding those aeroplanes on which all pitot/static drain vent valves have been modified with an insert in accordance with Raytheon Aircraft Repair Design Office instructions.

Requirement: 1. Drain the pitot/static and stall vent drain valves, then perform a leak test of the systems, in accordance with SB 34-3207.

2. If, as a result of the Requirement 1 drain check, all drain valves are found to be operative, but any valve does not pass the leak test, accomplish one of the following actions:

1. apply a temporary seal of the drain valve(s) in accordance with Raytheon Aircraft SB 34-3223, dated August 1999; or

b. replace the drain valve components with new or serviceable drain valve components in accordance with SB 34-3207 and perform a leak test in accordance with SB 34-3207; or