{"id":"F2006B03652","name":"AD/BEECH 1900/34 - KLN-90B GPS","slug":"ad-beech-1900-34-kln-90b-gps","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43242,"registerId":"commonwealth-F2006B03652-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor 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.\n\nBeechcraft 1900 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BEECH 1900/34 KLN-90B GPS 4/2001","sectionType":"part","heading":"AD/BEECH 1900/34 KLN-90B GPS 4/2001","content":"# AD/BEECH 1900/34 KLN-90B GPS 4/2001\n\nApplicability: Beech Model 1900D aeroplanes, serial numbers UE-156 through UE-299, that are equipped with a KLN-90B Global Positioning System (GPS) installed in accordance with Federal Aviation Administration (FAA) Supplemental Type Certificate (STC) SA00245WI-D.\n\nRequirement: Rewire the KLN-90B GPS in accordance with the Accomplishment Instructions section of Raytheon Mandatory Service Bulletin SB 34-3222, issued January 2000.\n\nNote: FAA AD 2001-04-05 Amdt 39-12123 refers.\n\nCompliance: Within the next 400 hours time-in-service after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 19 April 2001.\n\nBackground: The FAA received a report of inconsistent NAV \"FLAG\" displays on a KLN-90B GPS installed on a Beech 1900D aeroplane in accordance with STC SA00245WI-D. The copilot had the KLN-90B GPS selected as the NAV source and the pilot did not have a valid NAV source selected. This caused the flight director command bar to disappear from the copilot's electronic attitude director indicator (EADI), and the copilot received an inconsistent NAV \"FLAG”.\n\nThis Directive requires rewiring the KLN-90B GPS to eliminate the possibility of inconsistent NAV \"FLAG\" displays, as an inconsistent NAV \"FLAG\" display could cause the copilot to make decisions based on an invalid GPS source without knowing it was invalid.\n\n![](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 8 March 2001\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 21 March 2001.","sortOrder":1}],"analysis":{"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":false,"description":"The Directive applies only to Beech 1900D serial numbers UE-156 through UE-299 with KLN-90B installed per STC SA00245WI-D and adopts the FAA-referenced remedy. It does not broaden applicability or add alternate measures beyond the Raytheon service bulletin and the FAA AD reference (Applicability; Requirement; Note)."},"complexity_factors":["Narrow applicability limited to specific airframe serial numbers and installation method (Applicability).","Single corrective action: follow a manufacturer service bulletin to rewire the unit (Requirement).","Clear, short compliance window expressed in flight hours (Compliance).","Action is technical and safety‑critical, requiring qualified maintenance personnel and access to STC/SB instructions (Requirement & Background).","Dependence on an external document (Raytheon SB 34-3222) and on FAA AD cross-reference increases administrative linkage (Requirement; Note).","Regulatory enforcement discretion is minimal — AD prescribes the exact remedy and timing (Entire AD)."],"plain_english_summary":"This Airworthiness Directive requires operators of Beech 1900D aeroplanes (serials UE-156 to UE-299) fitted with a KLN-90B GPS under FAA STC SA00245WI-D to rewire that GPS following Raytheon Mandatory Service Bulletin SB 34-3222. The CASA delegate issued the AD; compliance must occur within the next 400 hours time-in-service. Operators pay for the maintenance work; the change aims to remove the risk of inconsistent NAV “FLAG” displays that could present invalid navigation information to the co‑pilot."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It targets a specific safety defect in a specific aircraft model with specific equipment configuration. There is no evidence of scope creep; the directive precisely matches the identified safety issue described in the background."},"complexity_factors":["Very short document (approximately 300 words)","Only 4 defined elements: specific aircraft model, serial number range, specific GPS model, and specific FAA approval certificate","Single, unambiguous requirement with clear reference to external technical document (Raytheon Service Bulletin)","Simple compliance deadline (400 hours time-in-service)","No nested conditions, exceptions, or cross-references to other legislation beyond noting related FAA AD","Straightforward causal chain in background: problem identified → safety risk explained → specific fix mandated"],"plain_english_summary":"This CASA Airworthiness Directive mandates rewiring of KLN‑90B GPS units on Beechcraft 1900D aircraft (S/N UE‑156 through UE‑299) installed under STC SA00245WI‑D to correct a fault that can hide invalid GPS navigation (inconsistent NAV FLAGs and loss of flight‑director cues). Work must follow Raytheon Service Bulletin SB 34‑3222 (Jan 2000) and be completed within 400 flight hours after 19 April 2001."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-1900-34-kln-90b-gps","history":"/api/acts/ad-beech-1900-34-kln-90b-gps/history","analysis":"/api/acts/ad-beech-1900-34-kln-90b-gps/analysis","conflicts":"/api/acts/ad-beech-1900-34-kln-90b-gps/conflicts","importantCases":"/api/acts/ad-beech-1900-34-kln-90b-gps/important-cases","documents":"/api/acts/ad-beech-1900-34-kln-90b-gps/documents"}}