AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/RAD/77 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.
Radio Communication and Navigation Equipment
AD/RAD/77
Amdt 1
Goodrich Avionics Systems TAWS8000 8/2004
Applicability: Goodrich Avionics Systems, Inc. TAWS8000 Terrain Awareness Warning System (TAWS), part number (P/N) 805-18000-001, that incorporates hardware "Mod None", "Mod A" or "Mod B".
Note 1: These systems are known to be installed on, but not limited to the following aeroplanes:
Manufacturer Manufacturer
Cessna Aircraft Company
Dassault Aviation
Gulfstream Aerospace LP/Israel Aircraft Industries
Raytheon Aircraft Company Saberliner Corporation
The New Piper Aircraft Inc
421, 500, 501, 525, 525A, 550, 551, 650
and S550
Mystère-Falcon 20 series
1125 Westwind Astra
100, 200, 300, 400A and F90 NA-265
PA-42-1000
Requirement: 1. Inspect the TAWS8000 TAWS installation in accordance with Goodrich Avionics Systems, Inc. Service Memo SM #134, dated 2 May 2003 or SM #134 revised 9 July 2003 and the applicable installation manual, to determine if both the TAWS8000 TAWS and any other device are connected to the same baro set potentiometer.
2. If, as a result of the Requirement 1 inspection, both the TAWS8000 TAWS and any other device are found to be connected to the same baro set potentiometer, remove the TAWS8000 TAWS, cap and stow the connecting wires in accordance with SM #134 and the applicable installation manual.
Note 2: This Requirement applies to TAWS8000 TAWS with "Mod None", "Mod A" or "Mod B" hardware installed, not to systems with “Mod C” hardware. TAWS8000 units with “Mod C” hardware may be fitted in lieu of "Mod None", "Mod A" or "Mod B" units in accordance with Goodrich Avionics Systems Alert Service Bulletin #A117 dated 9 July 2003.
Radio Communication and Navigation Equipment
AD/RAD/77 Amdt 1 (continued)
3. TAWS8000 TAWS, P/N 805-18000-001, that incorporates hardware ''Mod None'', ''Mod A'' or ''Mod B'' may not be installed, either as a replacement part or new installation, on any aeroplane.
Note 3: FAA AD 2004-08-15 Amdt 39-13584 Correction refers.
Compliance: For Requirement 1 - Remains unchanged as ‘Within the next five hours time in service after the effective date of original issue of this Directive’.
For Requirement 2 - Remains unchanged as ‘Before further flight immediately following the Requirement 1 inspection’.
For Requirement 3 - Remains unchanged as ‘As of the effective date of the original issue of this Directive.
This Amendment becomes effective on 5 August 2004.
Background: The United States Federal Aviation Administration (FAA) has advised that tests have shown that the TAWS8000 TAWS may cause altitude errors in other instruments.
This Directive is intended to prevent the loading of the baro set potentiometer, which could result in an unacceptable altitude error. Such a condition could cause the pilot to make flight decisions that may put the aeroplane in an unsafe flight condition.
The original issue of this Directive required the inspection of the TAWS installation and, if necessary, the removal of the TAWS if both the TAWS and any other device are connected to the same baro set potentiometer. The Directive also prohibited future installation of any TAWS8000 TAWS that incorporates hardware "Mod None", "Mod A" or "Mod B".
This amendment introduces a revised Service Memo as an alternate method of compliance together with a note clarifying the status of TAWS8000 units with “Mod C” hardware incorporated.
The original issue of this Airworthiness Directive became effective on 30 July 2003.
James Coyne
Delegate of the Civil Aviation Safety Authority 23 June 2004
The above AD is notified in the Commonwealth of Australia Gazette on 14 July 2004.
Overview
The Civil Aviation Safety Authority Act 1998 was enacted to provide a framework for ensuring the safety of civil aviation in Australia. This legislation aims to address gaps in aviation safety by establishing regulations, standards, and directives that govern the operation and maintenance of aircraft within Australian airspace. The Civil Aviation Safety Authority (CASA) is the body responsible for enforcing the Act and its associated regulations, with the primary objective of maintaining a high standard of safety in civil aviation. In the case of the Airworthiness Directive (AD) AD/RAD/77 Amdt 1, CASA issued this directive to address a specific safety concern related to the Goodrich Avionics Systems, Inc. TAWS8000 Terrain Awareness Warning System. This AD was enacted in response to the potential for altitude errors caused by the TAWS8000 system, which could lead to unsafe flight conditions. The directive mandates inspections, removal of affected TAWS systems, and prohibits the installation of certain hardware modifications to ensure the continued airworthiness of affected aircraft.
Scope and Application
The Airworthiness Directive issued by the Civil Aviation Safety Authority (CASA) under subregulation 39.1(1) of the Civil Aviation Safety Regulations 1998 (CASR) applies specifically to the Goodrich Avionics Systems, Inc. TAWS8000 Terrain Awareness Warning System, part number 805-18000-001, which incorporates hardware modifications "Mod None," "Mod A," or "Mod B." This directive is pertinent to aeroplanes such as those manufactured by Cessna Aircraft Company, Dassault Aviation, Gulfstream Aerospace LP/Israel Aircraft Industries, Raytheon Aircraft Company, Saberliner Corporation, and The New Piper Aircraft Inc, which include models like the Cessna 421, 500, 501, 525, 525A, 550, 551, 650, and S550, Dassault Mystère-Falcon 20 series, and Gulfstream 1125 Westwind Astra. The directive mandates actions necessary to address safety concerns identified with the TAWS8000 systems. Compliance with the directive is mandatory within the specified timeframes, with particular emphasis on preventing unsafe conditions related to altitude errors caused by the baro set potentiometer. The directive, effective from 5 August 2004, includes instructions for inspecting and, if necessary, removing the TAWS8000 systems and prohibits the installation of certain TAWS8000 units with specific hardware modifications.
Key Provisions
The key sections of this Airworthiness Directive (AD) mandate specific actions to address an unsafe condition identified in the Goodrich Avionics Systems TAWS8000 Terrain Awareness Warning System. Specifically, section (a) under the "Requirement" part of the AD mandates that an inspection of the TAWS8000 installation be conducted to ascertain if the system and any other device are connected to the same barometric setting potentiometer, following the instructions outlined in Goodrich Avionics Systems, Inc. Service Memo SM #134 or its revised version from 9 July 2003, and the applicable installation manual. Section (b) requires that if both the TAWS8000 TAWS and another device are found to be connected to the same baro set potentiometer, the TAWS8000 TAWS must be removed and the connecting wires capped and stowed in accordance with the Service Memo and the applicable installation manual. Section (c) prohibits the installation of the TAWS8000 TAWS that incorporates hardware "Mod None", "Mod A" or "Mod B" either as a replacement part or a new installation on any aircraft.
The AD imposes obligations on aircraft owners and operators to ensure that the inspections and necessary actions are carried out in compliance with the specified requirements and timeframes. Owners and operators must inspect the TAWS8000 installation within five hours of the effective date of the original issue of this Directive, as outlined in section (a) under "Compliance". If the inspection reveals that both the TAWS8000 TAWS and another device are connected to the same baro set potentiometer, the TAWS8000 TAWS must be removed and the connecting wires capped and stowed before further flight, as stipulated in section (b) under "Compliance". Additionally, TAWS8000 TAWS with "Mod None", "Mod A" or "Mod B" hardware may not be installed on any aircraft as of the effective date of the original issue of this Directive, as mentioned in section (c) under "Compliance".
Failure to comply with this AD may result in serious safety consequences, including potential altitude errors that could lead to unsafe flight conditions. The AD does not explicitly state penalties for non-compliance; however, the CASA delegate, James Coyne, has the authority to enforce compliance under subregulation 39.1 (1) of the Civil Aviation Safety Regulations 1998. Non-compliance with ADs can lead to enforcement actions, including fines and potential grounding of the affected aircraft until compliance is achieved.