{"id":"F2006B05431","name":"AD/PA-22/27 - Rapid Throttle Movement - Warning Placard","slug":"ad-pa-22-27-rapid-throttle-movement-warning-placard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46131,"registerId":"commonwealth-F2006B05431-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-22/27 - Rapid Throttle Movement - Warning Placard","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)  \nPiper PA-22 (Tri-Pacer and Colt) Series Aeroplanes\n\nAD/PA-22/27 Rapid Throttle Movement \\- Warning Placard 6/73\n\nApplicability: Models PA-22-150, PA-22S-150, PA-22-160, PA-22S-160 fitted with Lyc. 0-320 engines equipped with Marvel Schebler carburettors model MA-4SPA P/Nos. 10- 3678-11, 10-3678-12, 10-3678-32; and other PA-22 series aircraft which have been modified to these engines/carburettor configurations.\n\nRequirement: 1. Attach the following placard to the instrument panel near the throttle control and in full view of the pilot using letters of 1/8\" maximum size:\n\n“DO NOT OPEN THROTTLE RAPIDLY \\- IDLE TO FULL THROTTLE IN 2 SECONDS MINIMUM”.\n\nNote: The placard may be fabricated by the owner or operator.\n\nor 2. FAA AD 73-9-6.\n\nCompliance: Within 10 hours time in service after 9 May 1973.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1973 addressing a specific technical safety concern (rapid throttle movement in specific Piper aircraft configurations). It has not expanded beyond its original narrow scope of requiring a warning placard for this particular aircraft/engine/carburettor combination."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined/model variants in applicability section","Simple binary compliance options (install placard OR follow FAA AD)","Single, unambiguous requirement with clear physical specifications (1/8\" letter size)","No nested exceptions or conditional logic","No cross-references to other legislation beyond optional FAA AD reference","Straightforward deadline calculation (10 hours time in service after specific date)"],"plain_english_summary":"This is an **Airworthiness Directive** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners of certain **Piper PA-22 aircraft** (Tri-Pacer and Colt models with specific Lycoming engines and Marvel Schebler carburettors) to install a **warning placard** on the instrument panel.\n- The placard must warn pilots: **\"DO NOT OPEN THROTTLE RAPIDLY - IDLE TO FULL THROTTLE IN 2 SECONDS MINIMUM\"**\n- This prevents rapid throttle movements that could cause engine problems (likely carburettor icing, fuel starvation, or engine stalling).\n\n**Who it affects:**\n- Owners and operators of specific Piper PA-22 models (PA-22-150, PA-22S-150, PA-22-160, PA-22S-160) with Lycoming O-320 engines and specific Marvel Schebler carburettor models.\n- Also applies to any PA-22 that has been modified to use these engine/carburettor combinations.\n\n**Key requirements:**\n- Install the placard within **10 hours of flight time** after 9 May 1973.\n- The placard can be **made by the owner/operator** (doesn't need to be professionally manufactured).\n- Alternative compliance: Follow the equivalent **FAA Airworthiness Directive 73-9-6** (the US aviation safety regulator's version of the same rule).\n\n**Why it matters:**\nThis addresses a known safety risk where rapid throttle movement in these specific aircraft configurations could cause engine failure or rough running — critical during takeoff or landing when engine power is essential."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope is limited and explicit in the text: it covers specified PA-22 models fitted with the listed Lycoming O-320/Marvel-Schebler carburettor combinations and any PA-22 modified to those configurations (Applicability). The required remedy is narrowly prescribed (attach the specified placard or comply with FAA AD 73-9-6) and the compliance window is stated. The text does not indicate any broadening or narrowing beyond those explicit applicability and remedy provisions, so the scope has not changed from the instrument's stated applicability and requirements."},"complexity_factors":["Narrow, specific applicability to defined PA-22 models and specific carburettor part numbers (Applicability).","Single, simple required action (attach a placard with specified text) or alternative compliance with an FAA AD (Requirement).","Precise formatting and placement requirement for the placard (letters 1/8\" maximum, near throttle, in full view of pilot) (Requirement).","Owner/operator may fabricate the placard (reduces technical complexity) (Note).","Short compliance timeframe (10 hours time in service after 9 May 1973) increases urgency but not procedural complexity (Compliance)."],"plain_english_summary":"Owners/operators of certain Piper PA-22 (Tri-Pacer/Colt) fitted with Lycoming O-320 engines and Marvel‑Schebler MA‑4SPA carburettors must place (or self‑make) a cockpit placard reading “DO NOT OPEN THROTTLE RAPIDLY - IDLE TO FULL THROTTLE IN 2 SECONDS MINIMUM,” or instead comply with FAA AD 73‑9‑6. The measure, required within 10 hours TIS after 9 May 1973, aims to change pilot throttle behaviour to reduce a safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-22-27-rapid-throttle-movement-warning-placard","history":"/api/acts/ad-pa-22-27-rapid-throttle-movement-warning-placard/history","analysis":"/api/acts/ad-pa-22-27-rapid-throttle-movement-warning-placard/analysis","conflicts":"/api/acts/ad-pa-22-27-rapid-throttle-movement-warning-placard/conflicts","importantCases":"/api/acts/ad-pa-22-27-rapid-throttle-movement-warning-placard/important-cases","documents":"/api/acts/ad-pa-22-27-rapid-throttle-movement-warning-placard/documents"}}