{"id":"F2006B02490","name":"AD/AS 355/36 Amdt 1 - Aft Section Tail Rotor Drive Shaft Bearing","slug":"ad-as-355-36-amdt-1-aft-section-tail-rotor-drive-shaft-bearing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41746,"registerId":"commonwealth-F2006B02490-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AS 355/36 Amdt 1 - Aft Section Tail Rotor Drive Shaft Bearing","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)  \nEurocopter AS 355 (Twin Ecureuil) Series Helicopters\n\nAD/AS 355/36\n\nAmdt 1\n\n  \nAft Section Tail Rotor Drive Shaft Bearing 7/93\n\nApplicability: All AS 355 E, F, F1, F2 and N Series helicopters.\n\nRequirement: Action in accordance with Eurocopter Service Bulletin AS 355 No 05-02 Revision 4.\n\nNote: DGAC AD 82-078-005(B)R4 refers.\n\nCompliance: As specified in the requirement document but with a revised effective date of 30 June 1993.\n\nBackground: Due to in service failure the manufacturer has revised the inspection requirements of the drive shaft bearings which has been reflected in the DGAC AD. This amendment raised in sequence to mandate inspection of the drive shaft rubber bearings and to change the requirement document from the DGAC AD to the manufacturers SB.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1838},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This amendment narrows and clarifies the original directive by changing the reference document from a French aviation authority directive (DGAC AD 82-078-005(B)R4) to the manufacturer's specific Service Bulletin (AS 355 No 05-02 Revision 4). It also expands the specific scope to explicitly mandate inspection of the drive shaft rubber bearings, whereas the original focused on the bearing assembly generally without specifying the rubber components."},"complexity_factors":["Single technical issue addressed (one bearing assembly)","Short document with only 5 specific helicopter models affected","Single compliance requirement referencing one external technical document","No nested exceptions, conditional clauses, or alternative compliance methods","Minimal defined terms (only standard aviation abbreviations)"],"plain_english_summary":"This mandatory safety order requires owners/operators of Eurocopter AS 355 (E, F, F1, F2, N) helicopters to inspect the rubber bearings in the rear tail-rotor drive shaft per Eurocopter Service Bulletin AS 355 No. 05-02 Rev 4. The bearings can fail in normal flight, risking loss of control. Compliance is required by 30 June 1993; this bulletin replaces a prior French directive and explicitly mandates rubber-bearing checks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-as-355-36-amdt-1-aft-section-tail-rotor-drive-shaft-bearing","history":"/api/acts/ad-as-355-36-amdt-1-aft-section-tail-rotor-drive-shaft-bearing/history","analysis":"/api/acts/ad-as-355-36-amdt-1-aft-section-tail-rotor-drive-shaft-bearing/analysis","conflicts":"/api/acts/ad-as-355-36-amdt-1-aft-section-tail-rotor-drive-shaft-bearing/conflicts","importantCases":"/api/acts/ad-as-355-36-amdt-1-aft-section-tail-rotor-drive-shaft-bearing/important-cases","documents":"/api/acts/ad-as-355-36-amdt-1-aft-section-tail-rotor-drive-shaft-bearing/documents"}}