{"id":"F2006B06991","name":"AD/SF340/62 Amdt 1 - Engine Air Intake - Modification of Detachable Centre Inlet","slug":"ad-sf340-62-amdt-1-engine-air-intake-modification-of-detachable-centre-inlet","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114927,"registerId":"commonwealth-F2006B06991-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SF340/62 Amdt 1 - Engine Air Intake - Modification of Detachable Centre Inlet","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nSAAB SF340 Series Aeroplanes\n\nAD/SF340/62\n\nAmdt 1\n\n  \n\nEngine Air Intake \\- Modification of Detachable Centre Inlet\n\n  \n13/98\n\nApplicability: SAAB 340A series aircraft, serial number 004 through 159 (inclusive), and SAAB 340B series aircraft serial number 160 through 219 (inclusive) and 402 through 436 (inclusive), equipped with Aerospace Composite Technologies (ACT) Engine Air Intakes.\n\nRequirement: Modify the detachable centre inlet of the engine air intake in accordance with SAAB AB Service Bulletin SAAB 340-30-073 dated 18 August 1997.\n\nNote: SAD N0. 1-119R1 dated 08 October 1998 refers.\n\nCompliance: Within two years of the effective date of the original issue of this Directive.\n\nThis amendment becomes effective on 3 December 1998.\n\nBackground: The design and manufacturing of the detachable centre inlet of the engine air intake produces two apertures at the rear of the component. These holes must be closed to comply with fire resistance design regulations.\n\nThis amendment increases the applicability of this Directive.\n\nThe original issue of this Airworthiness Directive became effective on 4 December 1997.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment expands the Directive’s applicability. It applies to SAAB 340A serial numbers 004–159 and SAAB 340B serial numbers 160–219 and 402–436 equipped with ACT Engine Air Intakes, whereas the original issue (effective 4 December 1997) covered a narrower set of aircraft; the amendment became effective 3 December 1998."},"complexity_factors":["Technical modification must follow an external SAAB Service Bulletin (SAAB 340-30-073 dated 18 Aug 1997).","Applicability is limited to specific SAAB 340A and 340B serial-number ranges and only to aircraft equipped with ACT Engine Air Intakes, requiring precise fleet identification.","Fixed compliance deadline tied to the original Directive effective date (two years from 4 December 1997).","Regulatory amendment increases applicability, which alters the set of affected operators and maintenance schedules.","Implementation requires physical modification of components to meet fire-resistance design rules (hands-on maintenance, parts and labour coordination)."],"plain_english_summary":"This Airworthiness Directive requires certain SAAB 340 aircraft fitted with Aerospace Composite Technologies engine air intakes to modify the detachable centre inlet according to SAAB Service Bulletin SAAB 340-30-073 (18 Aug 1997) so two rear apertures are closed to meet fire-resistance design rules. Operators must complete the work within two years of the original Directive's effective date of 4 December 1997. This amendment increases the Directive's applicability to additional serial-numbered aircraft."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The amendment explicitly states it 'increases the applicability of this Directive' — meaning it expands the scope to cover more aircraft serial numbers than the original 1997 version. This is a modest expansion rather than a fundamental change in purpose, but it does represent a scope increase from the original intent."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined elements: specific aircraft serial number ranges, manufacturer (ACT), and reference to one Service Bulletin","Single, unambiguous compliance requirement with no exceptions or conditional logic","No cross-references to other legislation beyond a brief note about a related Swedish airworthiness directive (SAD N0. 1-119R1)","Clear, linear structure: applicability → requirement → compliance date → background"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of certain SAAB 340A/B aircraft fitted with Aerospace Composite Technologies (ACT) engine air intakes to seal two small holes in the centre inlet to meet fire-resistance standards, following SAAB Service Bulletin 340-30-073. The amendment expands the aircraft applicability; compliance was required by 4 December 1999. This action reduces risk of engine-fire spread and is compulsory under the AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-62-amdt-1-engine-air-intake-modification-of-detachable-centre-inlet","history":"/api/acts/ad-sf340-62-amdt-1-engine-air-intake-modification-of-detachable-centre-inlet/history","analysis":"/api/acts/ad-sf340-62-amdt-1-engine-air-intake-modification-of-detachable-centre-inlet/analysis","conflicts":"/api/acts/ad-sf340-62-amdt-1-engine-air-intake-modification-of-detachable-centre-inlet/conflicts","importantCases":"/api/acts/ad-sf340-62-amdt-1-engine-air-intake-modification-of-detachable-centre-inlet/important-cases","documents":"/api/acts/ad-sf340-62-amdt-1-engine-air-intake-modification-of-detachable-centre-inlet/documents"}}