{"id":"F2006B10326","name":"AD/GROB 115/7 Amdt 2 - Cancellation of the Reduction of the Never Exceed Speed","slug":"ad-grob-115-7-amdt-2-cancellation-of-the-reduction-of-the-never-exceed-speed","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56082,"registerId":"commonwealth-F2006B10326-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GROB 115/7 Amdt 2 - Cancellation of the Reduction of the Never Exceed Speed","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)  \nGrob G115 Series Aeroplanes\n\nAD/GROB 115/7\n\nAmdt 2\n\n  \n\nCancellation of the Reduction of the Never Exceed Speed\n\n  \n4/98\n\nApplicability: Models G115C, G115C2, G115D, G115D2, all serial numbers. Requirement: Action in accordance with Grob Service Bulletin 1078-69.\n\nNote: LBA AD 96-270/3 refers.\n\nCompliance: Unless already accomplished, before the next flight after 26 March 1998 .\n\nThis amendment becomes effective on 26 March 1998.\n\nBackground: The investigation of an incident of buffeting when an aircraft approached the never exceed speed, identified a vibration in the aircraft structure that had originated at the engine shock mounts as the cause.\n\nAmendment 1 required certain inspections to clear aircraft for aerobatic manoeuvres while maintaining the airspeed limitation of the previous issue of this Directive.\n\nAmendment 2 is issued in response to a revision of the related LBA AD which cancels the previously required airspeed limitation following successful completion of the buffeting investigation.\n\nAmendment 1 of this airworthiness directive became effective on 9 October 1997.\n\nThe original issue of this airworthiness directive became effective on 14 February 1996.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of the airworthiness directive. The original AD addressed a safety issue with never-exceed speed limitations due to structural vibration. Amendment 1 added inspection requirements while keeping the speed limit. Amendment 2 simply removes the speed limit after the safety issue was resolved. The scope remains focused on the single technical issue of engine mount vibration and speed restrictions for the Grob G115 series."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined models in applicability section","Single compliance requirement referencing an external technical document (Service Bulletin 1078-69)","No nested conditional logic or exceptions","Minimal cross-referencing (only one reference to German LBA AD 96-270/3)","Linear amendment history (original → Amendment 1 → Amendment 2) clearly explained in background"],"plain_english_summary":"CASA lifts a previously imposed speed restriction on Grob G115C/C2 and G115D/D2 trainers after the underlying engine-shock-mount vibration (causing buffeting near max speed) was investigated and rectified. Operators and owners of these aircraft must comply with Grob Service Bulletin 1078-69 (inspections/modifications) before flying after 26 March 1998. The AD restores full performance while ensuring the safety issue is addressed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 2 removes the earlier airspeed limitation by cancelling the reduction of the 'never exceed' speed and replaces it with a requirement to perform actions in Grob Service Bulletin 1078-69 prior to flight. The directive therefore narrows the operational restriction (lifts the imposed speed limit) while retaining a mandatory inspection/repair obligation (Amendment 2; Requirement; Compliance; Background)."},"complexity_factors":["Cross-reference to manufacturer service bulletin (Grob Service Bulletin 1078-69) as the required means of compliance (Requirement).","Immediate compliance deadline — must be done before next flight after 26 March 1998 — creates operational urgency (Compliance).","Applicability across multiple models and all serial numbers increases population affected (Applicability).","Technical cause identification (engine shock-mount vibration) requires specific inspections/repairs rather than simple administrative action (Background).","Amendment history and linkage to a related LBA AD introduce regulatory traceability and prior constraints to consider (Background; Note)."],"plain_english_summary":"This airworthiness directive removes a previously imposed reduction of the \"never exceed\" airspeed for Grob G115 series aeroplanes (models G115C/C2, G115D/D2, all serial numbers) and restores the prior speed limit after operators complete actions in Grob Service Bulletin 1078-69. It affects owners/operators of those aircraft and takes effect 26 March 1998.\n\nOperators must carry out the service-bulletin inspections/repairs before the first flight after that date. The change follows an investigation that traced buffeting to engine shock-mount vibration (Background; Requirement; Compliance)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-grob-115-7-amdt-2-cancellation-of-the-reduction-of-the-never-exceed-speed","history":"/api/acts/ad-grob-115-7-amdt-2-cancellation-of-the-reduction-of-the-never-exceed-speed/history","analysis":"/api/acts/ad-grob-115-7-amdt-2-cancellation-of-the-reduction-of-the-never-exceed-speed/analysis","conflicts":"/api/acts/ad-grob-115-7-amdt-2-cancellation-of-the-reduction-of-the-never-exceed-speed/conflicts","importantCases":"/api/acts/ad-grob-115-7-amdt-2-cancellation-of-the-reduction-of-the-never-exceed-speed/important-cases","documents":"/api/acts/ad-grob-115-7-amdt-2-cancellation-of-the-reduction-of-the-never-exceed-speed/documents"}}