{"id":"F2006B09420","name":"AD/ELECT/43 - J.E.T. Emergency Power Supply - Inspection/Modification","slug":"ad-elect-43-j-e-t-emergency-power-supply-inspection-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53804,"registerId":"commonwealth-F2006B09420-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ELECT/43 - J.E.T. Emergency Power Supply - Inspection/Modification","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nElectrical Equipment\n\nAD/ELECT/43 J.E.T. Emergency Power Supply \\- Inspection/Modification\n\nApplicability: All J.E.T. power supplies. Model PS835 series.\n\nRequirement: 1. If the installation incorporates a panel located battery test switch, install a temporary placard near the test switch which reads as follows:\n\n“To test emerg pwr supply\n\n    Disregard emerg pwr sw test position.\n\n    2. A/C master/batt sw \\- off.\n\n    3. Emerg pwr sw \\- on.\n\n    4. Ck operation of accessory/instr”.\n\n2. Modify as required by JET Alert SB A-SB501-1228-7. FAA AD 82-21-04 Amendment 39-4475 refers.\n\nCompliance: For Para. 1 \\- Within 100 hours time in service after 31 March 1983\\. For Para. 2 \\- Within 200 hours time in service after 31 March 1983.\n\nBackground: To prevent false indication that emergency power is available.\n\n  \n3/83","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive’s scope remains focused on all J.E.T. emergency power supplies, model PS835 series, requiring a temporary placard when a panel-located battery test switch is fitted and a modification per JET Alert SB A-SB501-1228-7. The instrument does not expand the class of equipment affected beyond the stated model series, nor does it add additional categories of operator; it prescribes specific corrective actions and deadlines consistent with the stated background purpose to prevent false indication of emergency power. (Applicability; Requirement 1; Requirement 2; Background)"},"complexity_factors":["Narrow applicability limited to J.E.T. power supplies, model PS835 series (Applicability)","Two discrete requirements with separate compliance windows (Requirement 1; Requirement 2; Compliance)","Reference to an external service bulletin (JET Alert SB A-SB501-1228-7) that contains the detail of the modification (Requirement 2)","Cross-reference to an FAA airworthiness directive (FAA AD 82-21-04 Amendment 39-4475) which may affect interpretation (Requirement 2)","Operational detail for placard content and test procedure embedded verbatim (Requirement 1)","Compliance timing creates scheduling and operational constraints for operators (Compliance)"],"plain_english_summary":"The directive requires operators of J.E.T. PS835 series emergency power supplies to fit a specified temporary placard with a battery-test procedure (if a panel test switch is present) and to carry out a modification per JET Alert SB within set hours‑in‑service deadlines. \n\nIt matters because it aims to prevent false indications of available emergency power; operators or their maintenance providers must schedule, pay for, and complete the work within the prescribed compliance windows."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific technical defect in a specific aircraft component. It has not expanded beyond its original purpose of preventing false emergency power indications."},"complexity_factors":["Single, specific equipment model targeted (J.E.T. PS835 series only)","Only two requirements: temporary placard installation and reference to external service bulletin","No defined terms section — all language is operational and plain","Simple conditional structure: 'If the installation incorporates...' followed by straightforward commands","Single cross-reference to external document (FAA AD 82-21-04) for the modification standard","Clear, fixed compliance deadlines based on flight hours","Document is extremely short (under 200 words)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners and operators to fix a specific safety problem.\n\n**What it does:**\nThis directive targets a specific piece of aircraft equipment: the **J.E.T. PS835 series emergency power supply** — a backup battery system that keeps critical instruments running if the main aircraft power fails.\n\nThe problem? The built-in battery test switch on these units gives **false readings** — it might show the emergency power is working when it's actually not. This is dangerous because pilots rely on this system in emergencies.\n\n**What must be done:**\n\n1. **Immediate temporary fix:** Install a warning label (placard) near the test switch telling pilots to ignore the standard test position and use a specific manual testing procedure instead.\n\n2. **Permanent fix:** Modify the unit according to the manufacturer's service bulletin (JET Alert SB A-SB501-1228-7), which aligns with an American FAA safety directive (AD 82-21-04).\n\n**Who it affects:**\nAnyone operating an aircraft with a J.E.T. PS835 series emergency power supply installed.\n\n**Why it matters:**\nFalse confidence in emergency equipment can kill. If a pilot thinks their backup power works but it doesn't, they could lose all instruments during an electrical failure — a potentially catastrophic situation, especially at night or in bad weather.\n\n**Deadlines:**\n- The warning label must be installed within **100 flight hours** after 31 March 1983\n- The permanent modification must be done within **200 flight hours** after 31 March 1983"}},"importantCases":[],"_links":{"self":"/api/acts/ad-elect-43-j-e-t-emergency-power-supply-inspection-modification","history":"/api/acts/ad-elect-43-j-e-t-emergency-power-supply-inspection-modification/history","analysis":"/api/acts/ad-elect-43-j-e-t-emergency-power-supply-inspection-modification/analysis","conflicts":"/api/acts/ad-elect-43-j-e-t-emergency-power-supply-inspection-modification/conflicts","importantCases":"/api/acts/ad-elect-43-j-e-t-emergency-power-supply-inspection-modification/important-cases","documents":"/api/acts/ad-elect-43-j-e-t-emergency-power-supply-inspection-modification/documents"}}