{"id":"F2006B09569","name":"AD/ENST 28/14 Amdt 1 - Upper Swashplate Bearing - Inspection and Lubrication","slug":"ad-enst-28-14-amdt-1-upper-swashplate-bearing-inspection-and-lubrication","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54240,"registerId":"commonwealth-F2006B09569-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ENST 28/14 Amdt 1 - Upper Swashplate Bearing - Inspection and Lubrication","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)  \nEnstrom F-28 Series Helicopters\n\nAD/ENST 28/14\n\nAmdt 1\n\n  \n\nUpper Swashplate Bearing \\- Inspection and Lubrication\n\n  \n10/94\n\nDM\n\nApplicability: All model F-28A, F-28C, F-28C-2, 280 and 280-C helicopters manufactured prior to January 1981.\n\nRequirement: Action in accordance with Enstrom Service Directive Bulletin No 0035 Revision A until requirements of Enstrom Service Information Letter (SIL) No 0110 Revision B have been incorporated.\n\nNote: FAA AD 76-06-11 Amdt 39-2560 refers to Enstrom SB No 0035.\n\nCompliance: Unless previously inspected in accordance with Enstrom Service Directive Bulletin No 0035 or 0035 Revision A inspect within 10 hours time in service from 22 July 1994. Thereafter, reinspect at intervals not exceeding 100 hours time in service until Enstrom SIL No 0110 Rev B has been incorporated.\n\nBackground: The manufacturer has introduce a modification that allows better servicing of the swashplate bearings. This amendment raised to provide terminating action for this Directive.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment adds a clear terminating action: recurring inspections and lubrication remain mandatory until operators incorporate Enstrom SIL No. 0110 Rev B, which provides a modification allowing improved servicing and ends the inspection requirement (Requirement; Background). Practically, the directive shifts the long‑term compliance choice to operators: continue recurrent inspections or install the manufacturer’s modification to stop them (Compliance)."},"complexity_factors":["Aircraft‑specific technical requirement (applies only to F‑28A, F‑28C, F‑28C‑2, 280 and 280‑C built before Jan 1981) (Applicability).","Short initial compliance window: inspect within 10 hours TIS from 22 July 1994 (Compliance).","Recurring inspection interval required (every 100 hours) until a manufacturer modification is incorporated (Compliance).","Dependence on external manufacturer documents: Enstrom Service Directive Bulletin No. 0035/Rev A and Enstrom SIL No. 0110 Rev B (Requirement).","Terminanting action conditional on incorporation of a specific Service Information Letter, creating an either/or compliance path (Requirement/Background).","Cross‑reference to FAA AD increases coordination of regulatory sources (Note).","Administrative burden for operators to track incorporation status and maintenance records to prove compliance."],"plain_english_summary":"This airworthiness directive requires owners/operators of Enstrom F‑28A/C/280 series helicopters manufactured before January 1981 to inspect and lubricate the upper swashplate bearing per Enstrom Service Directive Bulletin No. 0035 (Rev A). An initial inspection is required within 10 hours time‑in‑service from 22 July 1994 and then every 100 hours until the manufacturer’s Service Information Letter No. 0110 Rev B is incorporated — that incorporation acts as the terminating modification that ends the recurring inspections."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 1 to an existing Airworthiness Directive. The amendment serves its original purpose — it adds a terminating action (the SIL 0110 Rev B modification) that allows owners to stop the recurring inspections once the design improvement is installed. This is a natural evolution of the original safety mandate, not scope creep."},"complexity_factors":["Single, specific mechanical component addressed (upper swashplate bearing)","Clear applicability criteria (5 specific helicopter models, pre-1981 manufacture)","Straightforward compliance timeline (10 hours initial, 100 hours recurring)","Only 2 external documents referenced (Enstrom Service Directive Bulletin 0035 Rev A and SIL 0110 Rev B)","Simple terminating condition (modification per SIL 0110 Rev B ends the requirement)","No nested exceptions, conditional logic, or defined terms section","Short document (approximately 150 words of substantive text)"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and lubrication of the upper swashplate bearing on Enstrom F‑28 series helicopters built before January 1981 (F‑28A/C/C‑2, 280, 280‑C). It aims to prevent bearing seizure that could compromise rotor control.\n\nOperators must perform an initial inspection soon after the AD’s effective date and repeat lubrication at regular flight‑hour intervals per Enstrom Service Directive Bulletin No. 0035 Rev A, until the helicopter is modified per Enstrom SIL No. 0110 Rev B."}},"importantCases":[],"_links":{"self":"/api/acts/ad-enst-28-14-amdt-1-upper-swashplate-bearing-inspection-and-lubrication","history":"/api/acts/ad-enst-28-14-amdt-1-upper-swashplate-bearing-inspection-and-lubrication/history","analysis":"/api/acts/ad-enst-28-14-amdt-1-upper-swashplate-bearing-inspection-and-lubrication/analysis","conflicts":"/api/acts/ad-enst-28-14-amdt-1-upper-swashplate-bearing-inspection-and-lubrication/conflicts","importantCases":"/api/acts/ad-enst-28-14-amdt-1-upper-swashplate-bearing-inspection-and-lubrication/important-cases","documents":"/api/acts/ad-enst-28-14-amdt-1-upper-swashplate-bearing-inspection-and-lubrication/documents"}}