{"id":"F2006B07233","name":"AD/SWSA226/90 Amdt 3 - Auto Ignition Systems","slug":"ad-swsa226-90-amdt-3-auto-ignition-systems","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49074,"registerId":"commonwealth-F2006B07233-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/SWSA226/90 Amdt 2 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nFairchild (Swearingen) SA226 and SA227 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/SWSA226/90","sectionType":"part","heading":"AD/SWSA226/90","content":"# AD/SWSA226/90\n\nAmdt 3\n\n  \n\nAuto Ignition Systems 4/2003 TX","sortOrder":1},{"sectionNumber":"Model Serial Numbers","sectionType":"part","heading":"Model Serial Numbers","content":"## Model Serial Numbers","sortOrder":2},{"sectionNumber":"Aircraft Models Service Bulletin (Kit Dr","sectionType":"part","heading":"Aircraft Models Service Bulletin (Kit Drawing)","content":"## Aircraft Models Service Bulletin (Kit Drawing)","sortOrder":3},{"sectionNumber":"Fairchild Aircraft Models SA226-AT, SA22","sectionType":"part","heading":"Fairchild Aircraft Models SA226-AT, SA226-T, SA226-T(B) and SA226-TC Aeroplanes","content":"## Fairchild Aircraft Models SA226-AT, SA226-T, SA226-T(B) and SA226-TC Aeroplanes\n\nProcedures to Prevent an Engine Flameout While in Icing Conditions\n\nThe IGNITION MODE switches shall be selected to AUTO/CONT during all operations in actual or potential icing conditions described herein:\n\n    (1) During takeoff and climb out in actual or potential icing conditions.\n\n\\*(2) When ice is visible on, or shedding from propeller(s), spinner(s), or leading edge(s).\n\n\\*(3) Before selecting ANTI-ICE, when ice has accumulated.\n\n    (4) Immediately, any time engine flameout occurs as a possible result of ice ingestion.\n\n    (5) During approach and landing while in or shortly following flight in actual or potential icing conditions.\n\n\\*Note: If icing conditions are entered in flight without the engine anti- icing system having been selected, switch one ENGINE system to an ENGINE HEAT position. If the engine runs satisfactorily, switch the second ENGINE system to an ENGINE HEAT position and check that the second engine continues to run satisfactorily.\n\nFor the purpose of this POH/AFM supplement, the following definition applies: \"Potential icing conditions in precipitation or visible moisture meteorological conditions:\n\n    (1) Begin when the OAT is plus 5 degrees C (plus 41 degrees F) or colder, and\n\n    (2) End when the OAT is plus 10 degrees C (plus 50 degrees F) or warmer.''\n\nThe procedures and conditions described in this Annex supersede any other POH/AFM procedures or conditions.","sortOrder":5},{"sectionNumber":"Fairchild Aircraft Models SA227-AC, SA22","sectionType":"part","heading":"Fairchild Aircraft Models SA227-AC, SA227-AT and SA226-TT Aeroplanes Procedures to Prevent an Engine Flameout While in Icing Conditions","content":"## Fairchild Aircraft Models SA227-AC, SA227-AT and SA226-TT Aeroplanes Procedures to Prevent an Engine Flameout While in Icing Conditions\n\nThe IGNITION MODE switches shall be selected to OVERRIDE or, for those aircraft which have the auto-relite system installed, CONTINUOUS OR AUTO during all operations in actual or potential icing conditions described herein:\n\n(1) During takeoff and climb out in actual or potential icing conditions.\n\n\\*(2) When ice is visible on, or shedding from propeller(s), spinner(s), or leading edge(s).\n\n\\*(3) Before selecting ANTI-ICE, when ice has accumulated.\n\n    (4) Immediately, any time engine flameout occurs as a possible result of ice ingestion.\n\n    (5) During approach and landing while in or shortly following flight in actual or potential icing conditions.\n\n\\*Note: If icing conditions are entered in flight without the engine anti- icing system having been selected, switch one ENGINE system to an ENGINE HEAT position. If the engine runs satisfactorily, switch the second ENGINE system to an ENGINE HEAT position and check that the second engine continues to run satisfactorily.\n\nFor the purpose of this POH/AFM supplement, the following definition applies: \"Potential icing conditions in precipitation or visible moisture meteorological conditions:\n\n    (1) Begin when the OAT is plus 5 degrees C (plus 41 degrees F) or colder, and\n\n    (2) End when the OAT is plus 10 degrees C (plus 50 degrees F) or warmer.''\n\nThe procedures and conditions described in this Annex supersede any other POH/AFM procedures or conditions.","sortOrder":7}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This AD revokes the previous amendment (Amdt 2) and replaces it with mandatory ignition‑mode selection rules for listed SA226/SA227 models, together with a POH/AFM supplement that defines ‘potential icing’ and supersedes other procedures (preamble; Annex A & B; POH/AFM definition). Who pays: aircraft operators and pilots incur training, checklist revision, and any installation/inspection costs (Annex notes; service bulletin references). Who decides: CASA delegate under subregulation 39.1(1) of CAR 1998. Compliance: operators must follow the ignition selections during the specified flight phases and temperature conditions and consult referenced service material where kit/drawing guidance applies."},"complexity_factors":["Multiple model-specific rules: Annex A (SA226 variants) requires IGNITION MODE = AUTO/CONT, while Annex B (SA227 variants) requires OVERRIDE or CONTINUOUS/AUTO for auto-relite-equipped aircraft (Annex A & B lists).","Operational timing and conditional triggers: requirements apply across phases (takeoff, climb, approach/landing) and on conditional events (ice visible/shedding, before selecting ANTI‑ICE, immediately after flameout) (Annex A & B, numbered paragraphs (1)–(5)).","Defined meteorological threshold: ‘Potential icing conditions’ are defined by outside air temperatures (OAT ≤ +5°C begin, ≥ +10°C end), creating a clear but temperature‑dependent compliance window (POH/AFM supplement definition).","Supersession of other manuals: the AD's POH/AFM supplement explicitly supersedes any other POH/AFM procedures, which imposes a change to operational documentation and checklists (closing statement of each Annex).","Equipment variation: instructions differ if an auto‑relite system is installed (Annex B) and note use of ENGINE HEAT as a contingency, adding equipment‑dependent choices (Annex B note).","Regulatory provenance and revocation: the AD revokes AD/SWSA226/90 Amdt 2 and is issued under CASA delegate power (subregulation 39.1(1) of CAR 1998), indicating administrative discretion to change mandatory requirements (preamble).","Implementation ambiguity in document: references to service bulletin/kit and drawing appear but are not clearly transcribed here, which may require operators to consult the original service documents for installation/compliance detail (header references to Service Bulletin/Kit Drawing).","Compliance burden on operators/pilots: requires in‑flight procedural changes, training, and checklist updates; may also require inspection/installation work where equipment differs (Annex notes and service bulletin references)."],"plain_english_summary":"This Airworthiness Directive cancels the prior amendment and requires pilots/operators of Fairchild SA226 and SA227 series aeroplanes to use specified ignition‑mode settings to reduce the risk of engine flameout in actual or potential icing. It applies during defined flight phases (takeoff, climb, approach/landing, and when ice is visible or shedding) and sets temperature thresholds for ‘potential icing’; the AD’s POH/AFM supplement supersedes other procedures."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: preventing engine flameouts due to ice ingestion in specific Fairchild aircraft models. Amendment 3 appears to be a routine update (revoking Amendment 2) without expansion into unrelated operational areas. The scope covers the same aircraft types and addresses the same safety issue as the original AD/SWSA226/90."},"complexity_factors":["Short, single-purpose directive with clear operational instructions","Only 2 defined terms (OAT — outside air temperature, and 'potential icing conditions')","Simple conditional structure: 'if icing conditions exist, do X'","Two annexes with nearly identical content, differing only in ignition switch positions for different aircraft variants","No cross-references to other legislation beyond the enabling regulation (CAR 1998, subregulation 39.1(1))","Minimal exceptions — only equipment variation noted (auto-relite system installed vs not installed)"],"plain_english_summary":"This AD replaces the prior amendment and imposes mandatory ignition procedures for Fairchild Swearingen SA226/SA227 twin‑turboprops (Merlin/Metro) to reduce engine flameouts from ice ingestion. It requires pilots and operators to use specified ignition modes when in or near defined icing conditions and if ice is observed or an engine flames out.\n\nThe measures override any conflicting flight manual instructions and aim to keep engines firing and prevent sudden, catastrophic engine failures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-swsa226-90-amdt-3-auto-ignition-systems","history":"/api/acts/ad-swsa226-90-amdt-3-auto-ignition-systems/history","analysis":"/api/acts/ad-swsa226-90-amdt-3-auto-ignition-systems/analysis","conflicts":"/api/acts/ad-swsa226-90-amdt-3-auto-ignition-systems/conflicts","importantCases":"/api/acts/ad-swsa226-90-amdt-3-auto-ignition-systems/important-cases","documents":"/api/acts/ad-swsa226-90-amdt-3-auto-ignition-systems/documents"}}