{"id":"F2006B08451","name":"AD/CF34/2 - Fuel Control Bypass Valve","slug":"ad-cf34-2-fuel-control-bypass-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115955,"registerId":"commonwealth-F2006B08451-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CF34/2 - Fuel Control Bypass Valve","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  General Electric Turbine Engines - CF34 Series\n\n \n\nAD/CF34/2 Fuel Control Bypass Valve 7/88\n\nApplicability:  CF34-1A and -3A engines installed in Canadair CL-600-2A12 and CL-600-2B16 aircraft.\n\n \n\nRequirement:  Action in accordance with FAA AD 88-06-07 amendment 39-5866, paragraph (A) items (1) and (2).\n\n \n\nCompliance: Before 30 September 1988.\n\n \n\nBackground:  This Directive has been issued to require compliance with FAA AD 88-06-07. The FAA Directive requires replacement of the fuel control by-pass piston to prevent an engine flameout or uncommanded power roll back due to contamination of the fuel control.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1988 with a specific mechanical fix. It has not expanded beyond its original purpose of addressing the fuel control bypass valve contamination risk."},"complexity_factors":["Extremely short document (under 200 words)","Only 2 defined applicability criteria (engine models and aircraft types)","Single compliance deadline with no conditional exceptions","No cross-references to other Australian legislation beyond the enabling Civil Aviation Regulations 1998","Technical requirements incorporated by reference to external FAA document rather than spelled out in text"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft. It applies to specific **General Electric CF34 jet engines** (models -1A and -3A) installed in certain **Canadair CL-600 aircraft** (the -2A12 and -2B16 variants).\n\n**What it requires:** Aircraft operators must replace a faulty **fuel control bypass piston** in these engines before 30 September 1988.\n\n**Why it matters:** The faulty part could become contaminated, causing the engine to **flame out** (suddenly stop working) or experience **uncommanded power rollback** (unexpected loss of thrust). Either failure during flight could be catastrophic.\n\n**How it works:** Rather than rewriting the technical requirements, this Australian directive simply **adopts** the American Federal Aviation Administration (FAA) safety order AD 88-06-07, requiring compliance with specific paragraphs of that US regulation."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive does not change scope from the instrument's stated purpose. It mandates replacement of the fuel control by‑pass piston for CF34-1A and -3A engines installed in specified Canadair CL-600-2A12 and CL-600-2B16 aircraft, by reference to FAA AD 88-06-07 paragraph (A) items (1) and (2), on or before 30 September 1988, to address the stated risk of engine flameout or uncommanded power rollback due to fuel control contamination (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Narrow technical applicability to two engine models on two aircraft types (Applicability)","Direct incorporation by reference of an external FAA AD for procedural detail (Requirement)","Single explicit compliance deadline (Compliance)","Technical nature of the required action (replacement of a fuel control by‑pass piston) necessitating maintenance resources and parts (Requirement; Background)","No alternative procedures, exemptions, or staged compliance described in the text (Requirement)"],"plain_english_summary":"What this instrument does\n\n- This Airworthiness Directive (AD/CF34/2) requires operators to carry out specific maintenance actions on certain General Electric CF34 turbine engines. It mandates following the steps set out in the United States Federal Aviation Administration (FAA) Airworthiness Directive 88-06-07, paragraph (A) items (1) and (2). (Requirement)\n\nWho is affected\n\n- The AD applies only to CF34-1A and CF34-3A engines when they are installed in Canadair CL-600-2A12 and CL-600-2B16 aircraft. (Applicability)\n\nWhat must be done and when\n\n- Operators must perform the work required by FAA AD 88-06-07 paragraph (A) items (1) and (2) by 30 September 1988. (Requirement; Compliance)\n\nWhy the change is required (as stated in the instrument)\n\n- The directive states the required action is to replace the fuel control by-pass piston to prevent an engine flameout or an uncommanded reduction in power caused by contamination of the fuel control. (Background)\n\nWho pays and who decides\n\n- The aircraft owner/operator is responsible for arranging and paying for the replacement work and any associated downtime; the AD sets the mandatory action and deadline. (Applicability; Requirement; Compliance)\n\nIncentives and behavioural effects\n\n- Compliance removes the regulatory risk of non‑compliance and addresses the stated safety risk (engine flameout or power rollback due to contamination). Operators therefore have a clear incentive to schedule the mandated replacement before the compliance date. (Requirement; Compliance; Background)\n\nCompliance burden and implementation considerations\n\n- The AD refers to an external FAA document (FAA AD 88-06-07) for the specific steps to follow, which means operators must obtain and follow that FAA AD. The burden includes locating the correct piston parts, obtaining technical instructions from the FAA AD, scheduling maintenance, and bearing parts and labour costs. The AD sets a fixed deadline for completion. (Requirement; Compliance)\n\nDiscretion and enforcement\n\n- The directive incorporates the FAA AD instructions directly; it does not set out alternative actions or discretionary waivers in the text provided. Enforcement would focus on whether the required replacement was completed by the stated date. (Requirement; Compliance)\n\nTrade-offs and risks highlighted by the instrument\n\n- The instrument replaces a component to reduce the stated risk of flameout or uncommanded power rollback. That action requires operators to incur parts, labour and downtime costs and to follow an external FAA directive. The instrument does not describe any alternative mitigations, cost offsets, or transitional relief. (Requirement; Background; Compliance)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf34-2-fuel-control-bypass-valve","history":"/api/acts/ad-cf34-2-fuel-control-bypass-valve/history","analysis":"/api/acts/ad-cf34-2-fuel-control-bypass-valve/analysis","conflicts":"/api/acts/ad-cf34-2-fuel-control-bypass-valve/conflicts","importantCases":"/api/acts/ad-cf34-2-fuel-control-bypass-valve/important-cases","documents":"/api/acts/ad-cf34-2-fuel-control-bypass-valve/documents"}}