{"id":"F2006B10287","name":"AD/GENERAL/57 Amdt 1 - Pitot Heat Inoperative Indicators - Installation","slug":"ad-general-57-amdt-1-pitot-heat-inoperative-indicators-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55977,"registerId":"commonwealth-F2006B10287-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GENERAL/57 Amdt 1 - Pitot Heat Inoperative Indicators - Installation","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)  \nAircraft \\- General\n\nAD/GENERAL/57\n\nAmdt 1\n\n  \nPitot Heat Inoperative Indicators \\- Installation 10/92\n\nApplicability: Transport Category turbine powered aircraft with a maximum take-off weight greater than 5700 Kg used in regular public transport operations.\n\nRequirement: If a flight instrument pitot heating system is installed, an indication system must be provided to indicate to the flight crew when that pitot heating system is not operating. The indication system must comply with the following requirements:\n\n    (a) The indication provided must incorporate an amber light that is in clear view of a flight crew member.\n\n    (b) The indication provided must be designated to alert the flight crew if either of the following conditions exist:\n\n    (1) The pitot heating system is switched “OFF”.\n\n    (2) The pitot heating system is switched “ON” and any pitot tube heating element is inoperative.\n\nCompliance: Prior to 17 September 1992.\n\nBackground: Pilots of transport aircraft have encountered difficulties because they were unaware that pitot heat was inoperative. This amendment is issued to clarify the applicability following the introduction of Commuter Category aircraft.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2085},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This amendment narrows and clarifies the original directive's applicability to exclude Commuter Category aircraft, ensuring the requirement applies only to larger Transport Category aircraft following the introduction of the Commuter Category classification."},"complexity_factors":["Narrow, clearly defined applicability limited to specific aircraft weight and operational category","Simple binary requirement (install indicator meeting specific criteria)","Minimal conditional logic (only two failure states to detect: switched off or inoperative)","Specific but straightforward technical specifications (amber color, crew visibility requirements)"],"plain_english_summary":"**What this does:** This safety rule requires large commercial aircraft to install warning lights that alert pilots when the heating systems for their airspeed sensors are not working.\n\n**Who it affects:** Airlines operating transport-category turbine aircraft weighing more than 5,700 kg (such as commercial jets) in regular passenger service.\n\n**The technical requirement:** Aircraft must have an **amber warning light** visible to the flight crew that activates when:\n*   The pitot heat is switched off, or\n*   The pitot heat is switched on but any heating element has failed\n\n**Why it matters:** Pitot tubes are sensors that measure how fast the aircraft is flying. If they ice up at high altitude (which happens when the heaters fail), they give false readings. Without a warning light, pilots may not realize their airspeed indicators are unreliable, which creates serious safety risks during critical phases of flight like takeoff and landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-general-57-amdt-1-pitot-heat-inoperative-indicators-installation","history":"/api/acts/ad-general-57-amdt-1-pitot-heat-inoperative-indicators-installation/history","analysis":"/api/acts/ad-general-57-amdt-1-pitot-heat-inoperative-indicators-installation/analysis","conflicts":"/api/acts/ad-general-57-amdt-1-pitot-heat-inoperative-indicators-installation/conflicts","importantCases":"/api/acts/ad-general-57-amdt-1-pitot-heat-inoperative-indicators-installation/important-cases","documents":"/api/acts/ad-general-57-amdt-1-pitot-heat-inoperative-indicators-installation/documents"}}