{"id":"F2006B09596","name":"AD/ENST 28/6 - Pre-Certification Requirements - Modifications","slug":"ad-enst-28-6-pre-certification-requirements-modifications","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54318,"registerId":"commonwealth-F2006B09596-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ENST 28/6 - Pre-Certification Requirements - Modifications","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 28/6 Pre-Certification Requirements \\- Modifications 1/75\n\nApplicability: All model F28A.\n\nRequirement: Modify the aircraft in accordance with the requirements of ANO 101.24 in respect of the following:\n\n    (a) Install fuelling equipment bonding points at each fuel filling point.\n\n(b) Identify an external earthing point, for the attachment of ground connections on each landing gear assembly.\n\n    2. Install a safety harness and inertia reel for each pilot’s seat and a lap belt for the centre seat position in accordance with a scheme approved by the Secretary.\n\n    3. Replace the flexible hose assembly (P/No. 75386) from the fuel servo to the flow divider with a hose assembly meeting the fire resistance standards of FAA TSO C53B Type C or D or render it fire resistant to that standard by fitting an approved fire sleeve.\n\n    4. Ensure that an external power supply with reversed polarity cannot be connected to the aircraft electrical system.\n\nCompliance: Before 31 March 1975.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1753},"content_quality":"ok","complexity_score":3,"rejection_reason":"","scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope, applying solely to Enstrom F28A helicopters and four specific safety modifications. No expansion beyond the original intent (airworthiness improvements for fuel systems, occupant restraint, and electrical safety) is evident."},"complexity_factors":["References external technical standards (FAA TSO C53B Type C or D, ANO 101.24)","Specific aviation part number referenced (P/No. 75386)","Technical terminology requiring domain knowledge (bonding points, inertia reels, fuel servo, reversed polarity)","Alternative compliance pathways for item 3 (replacement OR fitting fire sleeve)","Short, discrete requirements list with no nested conditional logic"],"plain_english_summary":"This directive requires owners/operators of Enstrom F-28A helicopters to install four safety upgrades: grounding/bonding at fuel caps and landing gear to prevent static sparks during refueling; modern seat restraints (inertia‑reel harnesses for pilots and a lap belt for the center seat); replace or sleeve fuel hose P/N 75386 to meet fire‑resistant TSO C53B standards; and modify the external power connector to prevent reversed polarity. These changes reduce fire, crash, and electrical damage risks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-enst-28-6-pre-certification-requirements-modifications","history":"/api/acts/ad-enst-28-6-pre-certification-requirements-modifications/history","analysis":"/api/acts/ad-enst-28-6-pre-certification-requirements-modifications/analysis","conflicts":"/api/acts/ad-enst-28-6-pre-certification-requirements-modifications/conflicts","importantCases":"/api/acts/ad-enst-28-6-pre-certification-requirements-modifications/important-cases","documents":"/api/acts/ad-enst-28-6-pre-certification-requirements-modifications/documents"}}