{"id":"F2006B06381","name":"AD/PW100/2 Amdt 1 - High Pressure Rotor","slug":"ad-pw100-2-amdt-1-high-pressure-rotor","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47662,"registerId":"commonwealth-F2006B06381-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PW100/2 Amdt 1 - High Pressure Rotor","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPratt and Whitney Canada Turbine Engines \\- PW100 Series\n\nAD/PW100/2\n\nAmdt 1\n\n  \nHigh Pressure Rotor 4/91\n\nApplicability: All PW100 series engines.\n\nRequirement: Action in accordance with the technical requirements of Transport Canada Airworthiness Directive CF-89-14 Rev 1.\n\nCompliance: 1. PW115, PW118, PW120, PW120A, PW121 engines; at next access to affected parts.\n\n2. PW118A, PW123, PW124B, PW125B, PW126 engines; at next scheduled engine shop visit, but no later than 31 December 1991.\n\nBackground: This Directive has been amended to reflect a revision to the Requirement Document. The revision alleviates the compliance requirements for engines with PW115/PW120 series turbine components, and includes reference to alternative service bulletins acceptable to Transport Canada as meeting the intent of Airworthiness Directive CF- 89-14.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the airworthiness directive. The changes are limited to relaxing compliance requirements for specific engine variants (PW115/PW120 series turbine components) and expanding acceptable methods to include alternative service bulletins. These are technical refinements within the existing safety mandate, not an expansion beyond the original purpose of ensuring high-pressure rotor integrity."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined compliance deadlines based on engine model groupings","Single cross-reference to external Canadian directive (CF-89-14 Rev 1)","No nested exceptions or conditional logic — straightforward applicability ('All PW100 series engines')","Background section explains amendment rationale in plain language"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners and operators to take specific action to fix a known safety problem.\n\n**What it does:**\nThis directive applies to **Pratt & Whitney Canada PW100 series turbine engines** — the type commonly found in regional turboprop aircraft like the Dash 8. It mandates inspection or maintenance of the **high-pressure rotor** (a critical rotating component in the engine's core) following technical instructions from Transport Canada.\n\n**Who it affects:**\n- **Aircraft operators** flying planes with PW100 engines (including models PW115, PW118, PW120, PW121, PW123, PW124B, PW125B, and PW126)\n- **Maintenance organisations** responsible for servicing these engines\n\n**What must be done:**\nOperators must follow Canadian safety directive **CF-89-14 Rev 1**, which specifies how to inspect or repair the high-pressure rotor. The deadline depends on your engine model:\n- **PW115, PW118, PW120, PW120A, PW121:** Do it at the next time you already have access to the affected parts (no special downtime required)\n- **PW118A, PW123, PW124B, PW125B, PW126:** Do it at the next scheduled engine overhaul, but definitely before 31 December 1991\n\n**Why it matters:**\nHigh-pressure rotors spin at extreme speeds and temperatures. A failure here can cause catastrophic engine damage and potentially bring down an aircraft. This amendment makes compliance easier for some operators by allowing alternative approved methods and reducing urgency for certain engine variants."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment narrows and clarifies scope compared with the prior requirement document: it relieves or alters compliance obligations for engines that contain PW115/PW120 series turbine components and explicitly recognises alternative service bulletins acceptable to Transport Canada as meeting the directive’s intent. These changes modify which actions specific operators must undertake and allow alternative compliance paths via Transport Canada–accepted service bulletins. (Background)"},"complexity_factors":["References an external technical document (Transport Canada AD CF-89-14 Rev 1) rather than setting technical steps directly, requiring operators to obtain and follow that document (Requirement).","Different compliance timings for specific engine sub-models (next access vs next scheduled shop visit vs fixed calendar deadline), which requires model-by-model scheduling (Compliance).","Amendment alters obligations for engines with PW115/PW120 turbine components, creating differential treatment within the PW100 family (Background).","Allowance for alternative service bulletins acceptable to Transport Canada introduces cross-jurisdictional acceptance and a requirement to verify acceptability (Background)."],"plain_english_summary":"This instrument requires owners/operators of Pratt & Whitney Canada PW100-series engines to carry out the technical actions in Transport Canada Airworthiness Directive CF-89-14 Rev 1, with compliance timing varying by sub‑model (next access, next shop visit, or a hard date for some engines). The amendment narrows obligations for engines with PW115/PW120 turbine components and permits Transport Canada–accepted alternative service bulletins. Operators bear inspection/repair costs and must verify acceptable alternatives with Transport Canada."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pw100-2-amdt-1-high-pressure-rotor","history":"/api/acts/ad-pw100-2-amdt-1-high-pressure-rotor/history","analysis":"/api/acts/ad-pw100-2-amdt-1-high-pressure-rotor/analysis","conflicts":"/api/acts/ad-pw100-2-amdt-1-high-pressure-rotor/conflicts","importantCases":"/api/acts/ad-pw100-2-amdt-1-high-pressure-rotor/important-cases","documents":"/api/acts/ad-pw100-2-amdt-1-high-pressure-rotor/documents"}}