{"id":"F2006B06532","name":"AD/RAD/77 Amdt 1 - Goodrich Avionics Systems TAWS8000","slug":"ad-rad-77-amdt-1-goodrich-avionics-systems-taws8000","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48190,"registerId":"commonwealth-F2006B06532-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RAD/77 Amdt 1 - Goodrich Avionics Systems TAWS8000","content":"![](image.001.png)\n\n![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor 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.\n\n![](image.001.png)  \n\nRadio Communication and Navigation Equipment\n\nAD/RAD/77\n\nAmdt 1\n\n  \nGoodrich Avionics Systems TAWS8000 8/2004\n\nApplicability: 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\".\n\nNote 1: These systems are known to be installed on, but not limited to the following aeroplanes:\n\nManufacturer Manufacturer\n\nCessna Aircraft Company\n\nDassault Aviation\n\nGulfstream Aerospace LP/Israel Aircraft Industries\n\nRaytheon Aircraft Company Saberliner Corporation\n\nThe New Piper Aircraft Inc\n\n  \n421, 500, 501, 525, 525A, 550, 551, 650\n\nand S550\n\nMystère-Falcon 20 series\n\n1125 Westwind Astra\n\n100, 200, 300, 400A and F90 NA-265\n\nPA-42-1000\n\nRequirement: 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.\n\n    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.\n\nNote 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.\n\nRadio Communication and Navigation Equipment\n\nAD/RAD/77 Amdt 1 (continued)\n\n    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.\n\nNote 3: FAA AD 2004-08-15 Amdt 39-13584 Correction refers.\n\nCompliance: For Requirement 1 \\- Remains unchanged as ‘Within the next five hours time in service after the effective date of original issue of this Directive’.\n\nFor Requirement 2 \\- Remains unchanged as ‘Before further flight immediately following the Requirement 1 inspection’.\n\nFor Requirement 3 \\- Remains unchanged as ‘As of the effective date of the original issue of this Directive.\n\nThis Amendment becomes effective on 5 August 2004.\n\nBackground: The United States Federal Aviation Administration (FAA) has advised that tests have shown that the TAWS8000 TAWS may cause altitude errors in other instruments.\n\nThis 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.\n\nThe 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\".\n\nThis 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.\n\nThe original issue of this Airworthiness Directive became effective on 30 July 2003.\n\n![Signature of James Coyne Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 23 June 2004\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 14 July 2004.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The amendment does not change the substantive requirements (inspection, removal if connected to the same baro set potentiometer, and prohibition on installing Mod None/A/B units). It adds an alternate service memo as an accepted compliance method and clarifies that units with \"Mod C\" hardware may be fitted as replacements per Goodrich Alert Service Bulletin #A117 (Amendment text; Requirement; Note 2)."},"complexity_factors":["Technical avionics issue: interference with baro set potentiometer that can create altitude errors (Requirement, Background).","Multiple, specific hardware configurations and conditional treatment of \"Mod None\", \"Mod A\", \"Mod B\" versus \"Mod C\" (Requirement, Note 2).","Cross-reference to manufacturer documents as mandatory methods: Goodrich Service Memo SM #134 (two dates), installation manuals, and Alert Service Bulletin #A117 (Requirement, Note 2).","Tight compliance timeframes and phased actions: immediate short-term inspection (within five hours TIS), removal before further flight if found, and an immediate ban on future installations (Compliance; Requirement 1–3).","Prohibition on future installations creates ongoing compliance and procurement consequences for operators and maintainers (Requirement 3).","Interlocking foreign regulator action: references and corrections to FAA AD 2004-08-15 and coordination with U.S. testing findings (Background, Note 3).","Applicability across many aircraft types and operators increases administrative scope and tracking burden (Note 1 lists manufacturers/models).","Regulatory provenance and enforcement: issued by CASA delegate under CASR 1998 subregulation 39.1(1), so delegated administrative discretion underpins the directive (preamble, signature)."],"plain_english_summary":"This Airworthiness Directive requires operators to inspect Goodrich TAWS8000 units (P/N 805-18000-001) with hardware Mod None/A/B to see if they share the aircraft baro set potentiometer with another device; if they do, the TAWS must be removed and its wires capped and stowed, and Mod None/A/B units are banned from future installation. CASA issued the directive under CASR authority.\n\nOperators (owners/maintainers) pay for inspections, removals and any replacements; compliance deadlines are very short (see Requirement and Compliance). The amendment adds an alternate service memo method and clarifies Mod C as an acceptable replacement."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly scoped to the original safety issue. It introduces an alternative compliance method (revised Service Memo) and clarifies the status of Mod C hardware, but does not expand the applicability, add new requirements, or address unrelated safety concerns. The core mandate — inspect, remove if necessary, and prohibit future installations of specific hardware versions — remains unchanged from the original 2003 directive."},"complexity_factors":["Single-issue directive with only 3 requirements","Limited applicability (one specific part number with specific hardware mods)","Clear compliance deadlines (time-in-service hours, before further flight, effective date)","Minimal cross-referencing (only references FAA AD and manufacturer service bulletins in notes)","Straightforward conditional logic (if shared connection found → remove; else → no action)","Short document (approximately 1 page of substantive text)"],"plain_english_summary":"This AD mandates inspection and corrective action for Goodrich TAWS8000 units that share the baro set potentiometer with other cockpit instruments because that wiring can corrupt altitude data. Affected owners/operators (business jets and turboprops with Mod None/A/B hardware) must remove and isolate any offending units and may not install those older mods.\n\nThe amendment adds an alternative compliance route via a revised service memo and confirms Mod C hardware is an acceptable replacement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rad-77-amdt-1-goodrich-avionics-systems-taws8000","history":"/api/acts/ad-rad-77-amdt-1-goodrich-avionics-systems-taws8000/history","analysis":"/api/acts/ad-rad-77-amdt-1-goodrich-avionics-systems-taws8000/analysis","conflicts":"/api/acts/ad-rad-77-amdt-1-goodrich-avionics-systems-taws8000/conflicts","importantCases":"/api/acts/ad-rad-77-amdt-1-goodrich-avionics-systems-taws8000/important-cases","documents":"/api/acts/ad-rad-77-amdt-1-goodrich-avionics-systems-taws8000/documents"}}