{"id":"F2006B06516","name":"AD/RAD/62 - KLN 89B RAIM Warning","slug":"ad-rad-62-kln-89b-raim-warning","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48117,"registerId":"commonwealth-F2006B06516-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RAD/62 - KLN 89B RAIM Warning","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nRadio Communication and Navigation Equipment\n\nAD/RAD/62 KLN 89B RAIM Warning 9/98\n\nApplicability: All aircraft fitted with Allied Signal KLN 89B GPS RNAV system P/N 066-01148- 0101 with software mod level 01/03 or 01/04 and configured for IFR GPS non- precision approaches (NPA) or en-route/terminal area operations.\n\nRequirement: 1. Aircraft installations previously configured and approved for IFR NPA are no longer approved and a placard stating:\n\n“GPS NOT TO BE USED FOR IFR NON-PRECISION APPROACH”\n\nis to be installed adjacent to the GPS receiver, in clear view of and easily readable by the pilot.\n\n    2. Aircraft installations previously configured and approved for IFR primary means en-route only operation are no longer approved and a placard stating:\n\n“GPS LIMITED TO VFR OPERATIONS ONLY”\n\nis to be installed adjacent to the GPS receiver, in clear view of, and easily readable by the pilot.\n\nNote: The configuration of the KNL89B can be determined as en-route only if the APT 8 page is not accessible and a page stating “GPS APPROACHES DISABLED” must be acknowledged upon power up.\n\nOR\n\n    3. Install software update in accordance with Allied Signal Software Bulletin KLN 89B-SW2 to incorporate software mod level 01/05.\n\nCompliance: Requirement 1 and 2. Prior to next flight after the effective date of this AD. Requirement 3. Prior to next flight after the effective date of this AD.\n\nThis airworthiness directive becomes effective on 13 August 1998.\n\nBackground: Two anomalies have been reported by Allied Signal by Alert Installation Bulletin\n\n423. The KLN 89B, configured for non-precision approaches, will not annunciate a Receiver Autonomous Integrity Monitoring (RAIM) position error within the required 10 seconds in terminal and approach modes if the aircraft has been in a turn. The annunciation could take up to 30 seconds after the turn has been completed.\n\nIf the KLN 89B is configured for IFR en-route only operation RAIM is not enabled properly and RAIM errors will not be annunciated.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific software defect in a specific GPS unit. It has not expanded beyond this safety-critical equipment fix."},"complexity_factors":["Single, specific equipment model targeted (KLN 89B with specific part number and software levels)","Only three compliance options, clearly stated","No defined terms section — all technical terms explained in context or self-explanatory to aviation professionals","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","Simple conditional logic: if configuration X, do Y; if configuration Z, do alternative; or do software update","Single effective date with immediate compliance required (prior to next flight)","Background section provides clear rationale without legal caveats"],"plain_english_summary":"This CASA Airworthiness Directive orders action on a software bug in Allied Signal KLN 89B GPS units (p/n 066-01148-0101, SW v01/03 or v01/04) that can delay or suppress RAIM warnings during turns on IFR approaches or en‑route procedures. Operators must either restrict the unit to VFR (placard downgrade) or install a software fix. The issue undermines RAIM’s integrity alerts, raising the risk of undetected position errors during critical flight phases."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive withdraws previously granted IFR approvals for affected KLN 89B installations (it explicitly states such installations are no longer approved) and narrows permitted use until either placards are fitted or the unit is upgraded to software mod 01/05. In short, it removes earlier operational approvals for the specified configurations to address the reported RAIM anomalies."},"complexity_factors":["Narrow technical applicability: only KLN 89B units with software mod level 01/03 or 01/04 are affected","Immediate compliance deadline: requirements must be met prior to the next flight after the effective date","Two alternative remedies: installation of placard(s) with different wording depending on prior approval vs software update to mod 01/05","Determination of current configuration requires checking unit pages (APT 8 page / “GPS APPROACHES DISABLED” message)","Safety-critical subject matter (RAIM annunciation timing) increases operational risk if misidentified","Implementation relies on following Allied Signal Software Bulletin KLN 89B-SW2 for the software update"],"plain_english_summary":"This airworthiness directive requires operators of aircraft fitted with Allied Signal KLN 89B GPS units (software mod 01/03 or 01/04) to either fit a visible placard limiting GPS use for IFR operations or install a specified software update (mod 01/05). The Civil Aviation Safety Authority requires compliance before the next flight because the affected units can delay or fail to annunciate RAIM integrity warnings after turns. Operators pay for the placard or retrofit; pilots must avoid the restricted IFR uses unless the unit is updated."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rad-62-kln-89b-raim-warning","history":"/api/acts/ad-rad-62-kln-89b-raim-warning/history","analysis":"/api/acts/ad-rad-62-kln-89b-raim-warning/analysis","conflicts":"/api/acts/ad-rad-62-kln-89b-raim-warning/conflicts","importantCases":"/api/acts/ad-rad-62-kln-89b-raim-warning/important-cases","documents":"/api/acts/ad-rad-62-kln-89b-raim-warning/documents"}}