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

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Legislation au F2006B10446 In force Legislative Instrument

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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

 

c.         modify the drain valves in accordance with Raytheon Aircraft SB 34-3282, dated August 1999.

 

Modification of ALL the drain valves in accordance with SB 34-3282 constitutes terminating action for the requirement to perform repetitive leak tests.

 

3.    If any drain valve was sealed in accordance with Requirement 2.a., either Requirement 2.b. or 2.c. must be accomplished.

 

4.    If, as a result of the Requirement 1 drain check, any drain valve is inoperative (eg. plugged or taped), whether or not any leaking is detected, disassemble the valve and clean all obstructions in accordance with SB 34-3207 and perform a general visual inspection for corrosion of the drain valve.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

 

 

 

Note 1: For the purposes of this Directive, a general visual inspection is defined as: "A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight, and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked."

 

5.    If no corrosion of the drain valves is detected during the Requirement 4 inspection, accomplish either of the following actions:

 

  1. perform a leak test in accordance with SB 34-3207; or

 

b.         modify any inoperative valve in accordance with SB 34-3282.

 

Modification of ALL the drain valves in accordance with SB 34-3282 constitutes terminating action for the requirement to perform repetitive leak tests.

 

6.    If any drain valve is found to be corroded during the Requirement 4 inspection, inspect the connecting tubing for corrosion and replace any corroded valve or tubing with a new or serviceable valve or tubing in accordance with SB 34-3207. Then accomplish either of the following actions:

 

  1. perform a leak test in accordance with SB 34-3207; or

 

b.         modify any replaced drain valve in accordance with SB 34-3282.

 

Modification of ALL the drain valves in accordance with SB 34-3282 constitutes terminating action for the requirement to perform repetitive leak tests.

 

Note 2: FAA AD 2000-22-03 Amdt 39-11949 refers.

 

Compliance:  For Requirement 1 - Within 300 hours time in service (TIS) after the effective date of this Directive and, if all valves are found to be operating correctly, repeat the leak test at intervals not to exceed 300 hours TIS until all drain valves are modified.

 

For Requirement 2 - Before further flight and, if action specified in either Requirement 2.b. or 2.c. is accomplished, repeat the leak test at intervals not to exceed 300 hours TIS until all drain valves are modified.

 

For Requirement 3 - Within 300 hours TIS after Requirement 2.a. was accomplished. For Requirement 4 - Before further flight.

 

 

 

For Requirement 5 - Before further flight and thereafter repeat the leak check at intervals not to exceed 300 hours TIS until all drain valves are modified.

 

For Requirement 6 - Before further flight and thereafter repeat the leak check at intervals not to exceed 300 hours TIS until all drain valves are modified.

 

This Airworthiness Directive becomes effective on 25 January 2001.

 

Background:  This Directive requires leak checks and inspections for corrosion of the pitot/static and stall vent drain valves and, if necessary, replacement of certain components.

These actions are intended to prevent erroneous altimeter and airspeed indications due to plugged or taped pitot/static and stall vent drain valves.


 

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 11 December 2000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


The above AD is notified in the Commonwealth of Australia Gazette on 20 December 2000.

Overview

The Civil Aviation Regulations 1998 (CAR) were enacted to establish safety standards and procedures for civil aviation in Australia. One specific legislative instrument under these regulations is the Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority (CASA), which aims to address safety concerns through mandatory actions on certain aircraft. AD/HS 125/164 was issued under subregulation 39.1(1) of CAR 1998 in response to identified issues with the pitot/static and stall vent drain valves in various models of the British Aerospace BAe 125 series aeroplanes. The directive mandates specific actions, including drain checks, leak tests, and potential modifications to prevent erroneous altimeter and airspeed indications. Compliance with this directive is necessary to maintain the airworthiness of affected aircraft, ensuring safety in civil aviation operations. The AD became effective on 25 January 2001, outlining clear requirements and timeframes for implementation.

Scope and Application

This Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority (CASA) pertains specifically to the British Aerospace BAe 125 Series Aeroplanes, including models DH.125, HS.125, BH.125, BAe.125, Hawker 800, Hawker 800XP, and Hawker 1000. The directive applies to all such aircraft except those that have already undergone modifications to their pitot/static and stall vent drain valves as specified in Raytheon Aircraft Service Bulletin SB 34-3207. The AD mandates certain actions to rectify any unsafe conditions identified in the aeroplanes' pitot/static and stall vent drain valves. These actions include draining and leak testing the valves, sealing or replacing them if necessary, and conducting inspections for corrosion. The AD outlines specific requirements and timelines for these actions, such as performing the initial leak test within 300 hours of the directive's effective date, or before further flight if a valve was previously sealed, and repeating the leak tests at intervals not exceeding 300 hours of time in service until all drain valves are modified. The AD is effective from 25 January 2001, and its requirements are enforceable under the Civil Aviation Regulations 1998.

Key Provisions

The main operative sections of the Airworthiness Directive (AD) F2006B10446 (AD/HS 125/164) pertain to specific actions that must be taken on certain models of British Aerospace BAe 125 Series aeroplanes to address issues with pitot/static and stall vent drain valves. Section 1 of the AD specifies the applicability of the directive to various models of the BAe 125 series, excluding those aeroplanes where all pitot/static drain vent valves have already been modified. Section 2 outlines the requirement for draining the pitot/static and stall vent drain valves, performing a leak test, and taking corrective actions if necessary, such as sealing, replacing, or modifying the drain valves. Section 3 details the specific actions to be taken if any drain valve is found inoperative or corroded during the inspection, including cleaning, modifying, or replacing the affected components. Section 4 and Section 5 set out the compliance timelines, requiring actions to be taken within specific intervals or before further flight. The obligations imposed by this AD on the parties or entities it governs include conducting a thorough inspection and leak test of the pitot/static and stall vent drain valves. Operators of the affected aeroplanes must follow the instructions provided in Raytheon Aircraft Service Bulletins SB 34-3207, SB 34-3223, and SB 34-3282. Operators must take immediate action to address any issues identified during the inspection, such as sealing, replacing, or modifying the drain valves as required. Operators must also ensure that these actions are completed within the specified timelines and that the aeroplanes are not flown until the required inspections and modifications have been completed. Failure to comply with the provisions of this AD can result in serious safety risks, including erroneous altimeter and airspeed indications due to plugged or taped pitot/static and stall vent drain valves. The AD does not specify particular offences or penalties for non-compliance, but it is an enforceable directive under the Civil Aviation Regulations 1998 (CAR 1998). Non-compliance could potentially lead to enforcement actions by the Civil Aviation Safety Authority (CASA), including fines, suspension of airworthiness certificates, or other regulatory penalties. The exact consequences would depend on the specific circumstances of the non-compliance and any subsequent investigation or enforcement actions taken by CASA.

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Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.