{"id":"F2009L04403","name":"AD/SF340/44 Amdt 1 - Propeller Brake Valve","slug":"ad-sf340-44-amdt-1-propeller-brake-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":82182,"registerId":"commonwealth-F2009L04403-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"SAAB SF340 Series Aeroplanes","sectionType":"division","heading":"SAAB SF340 Series Aeroplanes","content":"### SAAB SF340 Series Aeroplanes\n\n| AD/SF340/44 Amdt 1 | Propeller Brake Valve | 24/2009 |\n| ------------------ | --------------------- | ------- |\n\n| Applicability: | SF340A models with S/No’s -004 to 159 inclusive and SF340B models with S/No’s-160 and subsequent fitted with an operational propeller brake system.                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with Saab Aircraft AB Service Bulletin (SB) SAAB 340-61-032 Rev.1.Incorporation of Saab Aircraft AB SB 340-61-33 is accepted as an alternative means of compliance with this AD and will remove the periodical inspection required.The use of later approved revisions of the above documents is acceptable for compliance with the requirements of this AD.Note: Swedish AD No. 1-064 Rev.1.                                                                                                                                                              |\n| Compliance:    | Within 100 hours TIS from 15 September 1994. Thereafter, re-inspect at intervals not exceeding 100 hours TIS.                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n|                | This Amendment becomes effective on 28 January 2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Background:    | The manufacture advised that application of the propeller brake may not prevent the propeller from turning if the hydraulic pump is turned off.This amendment updates the revision status of the applicable Swedish AD, rearranges the contents and formalises the intent of the Swedish AD revision by presenting an alternative means of compliance that gives terminating action to this AD by removal of the inspection intervals. No changes have been made that affect the technical or certification requirements made in compliance with the previous issue of this AD. |\n\n![](image.001.png)\n\nWilliam David  \nDelegate of the Civil Aviation Safety Authority\n\n30 November 2009","sortOrder":0},{"sectionNumber":"AD/SF340/44 Amdt 1","sectionType":"part","heading":"AD/SF340/44 Amdt 1","content":"## AD/SF340/44 Amdt 1","sortOrder":1},{"sectionNumber":"Propeller Brake Valve","sectionType":"part","heading":"Propeller Brake Valve","content":"## Propeller Brake Valve","sortOrder":2},{"sectionNumber":"24/2009","sectionType":"part","heading":"24/2009","content":"## 24/2009","sortOrder":3}],"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":3,"scope_assessment":{"changed":false,"description":"The amendment updates revision status, rearranges content, and presents an alternative terminating means of compliance (Saab SB 340-61-33) but explicitly states that \"No changes have been made that affect the technical or certification requirements made in compliance with the previous issue of this AD.\" Therefore the operational scope and technical requirements remain unchanged; the amendment mainly alters compliance pathways and documentation references (Background; Requirement)."},"complexity_factors":["Serial-numbered applicability (SF340A S/No -004–159; SF340B S/No 160 and subsequent) requires checking individual aircraft records (Applicability).","Time-based compliance: initial inspection window tied to a past date and recurring 100-hour TIS intervals impose ongoing maintenance scheduling and tracking (Compliance).","Alternative terminating action: incorporation of Saab SB 340-61-33 removes the inspection burden but requires installing the service bulletin and verifying conformity (Requirement).","Acceptance of later approved revisions of referenced documents allows administrative flexibility but requires operators to confirm which revision satisfies the AD (Requirement).","Cross-reference to a foreign airworthiness directive (Swedish AD) and an updated revision status adds traceability requirements for technical records (Background).","Effective date vs. compliance-from date: the amendment is effective 28 Jan 2010 while the compliance window refers to 15 Sep 1994, which may complicate historical compliance demonstrations (Compliance / Amendment effective date)."],"plain_english_summary":"Mandates inspection of the propeller brake valve on Saab SF340A (S/No -004–159) and SF340B (S/No 160 onwards) aeroplanes fitted with an operational propeller brake: inspect within 100 hours TIS from 15 September 1994 and then every 100 hours, unless Saab Service Bulletin SB 340‑61‑33 is incorporated, which removes the recurring inspections. \n\nThis follows the manufacturer's advice that the brake may not prevent rotation if the hydraulic pump is off; it affects aircraft owners/operators who must perform or fund inspections or adopt the terminating service bulletin."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment explicitly states it makes no changes to technical or certification requirements. It is purely administrative — updating document references, rearranging content, and formalising an alternative compliance path that was already available. The scope remains exactly as originally intended: addressing the propeller brake valve safety issue in specified SAAB SF340 aircraft."},"complexity_factors":["Short, single-purpose document (1 page)","Only 2 defined compliance paths (inspection regime or terminating modification)","Simple conditional applicability (specific serial number ranges plus system installation status)","Minimal cross-referencing (only to 2 Saab Service Bulletins and 1 Swedish AD)","Straightforward temporal compliance structure (100 hours TIS — Time In Service)","No nested exceptions or complex definitional sections"],"plain_english_summary":"This AD requires owners/operators of certain SAAB SF340A (s/n 004–159) and SF340B (s/n 160 onwards) with an operational propeller brake to either inspect the propeller brake valve at regular intervals or install a Saab modification that permanently fixes the fault. It addresses a condition where the propeller may keep spinning if the hydraulic pump is off, posing a serious safety risk.\n\nThis document amends the existing directive to update references and formally recognise the permanent modification option."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-44-amdt-1-propeller-brake-valve","history":"/api/acts/ad-sf340-44-amdt-1-propeller-brake-valve/history","analysis":"/api/acts/ad-sf340-44-amdt-1-propeller-brake-valve/analysis","conflicts":"/api/acts/ad-sf340-44-amdt-1-propeller-brake-valve/conflicts","importantCases":"/api/acts/ad-sf340-44-amdt-1-propeller-brake-valve/important-cases","documents":"/api/acts/ad-sf340-44-amdt-1-propeller-brake-valve/documents"}}