{"id":"F2006B02083","name":"AD/AC/24 - Fuel Pressure Gauge Vent Drain - Installation","slug":"ad-ac-24-fuel-pressure-gauge-vent-drain-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41313,"registerId":"commonwealth-F2006B02083-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/24 - Fuel Pressure Gauge Vent Drain - Installation","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 5/1962,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Fuel Pressure Gauge Vent Drain - Installation,24\ntitle: Airworthiness Directive - AD/AC/24 - Fuel Pressure Gauge Vent Drain - Installation\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\n \n\nAD/AC/24 Fuel Pressure Gauge Vent Drain - Installation 5/62\n\nApplicability: All models with S/Nos. 1 to 1170 except 1133, 1153, 1156, 1162. Model 720 and pressurised versions of 680F.\n\n \n\nDocument: 1. Aero Commander SB No. 78; or\n\n \n\n2. FAA AD 62-8-1.\n\n \n\nCompliance: Forthwith.\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 vintage Airworthiness Directive (Issue 5/1962) that remains in its original narrow scope. It addresses a specific technical defect in a specific aircraft type with a specific remedy. There is no evidence of scope creep — it has not expanded to cover additional aircraft types, additional systems, or additional compliance requirements beyond the original fuel pressure gauge vent drain installation."},"complexity_factors":["Extremely short document (approximately 200 words)","Only 4 defined terms or references (AD number, applicability, document references, compliance)","Simple conditional logic: applies to serial numbers 1-1170 with only 4 explicit exclusions","No nested exceptions or cross-references to other legislation sections","Single compliance action with immediate effect","No interpretive provisions, penalty clauses, or procedural requirements"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it requires:** Owners and operators of specific Twin Commander aircraft must install a vent drain on the fuel pressure gauge. This is a physical modification to prevent fuel system problems.\n\n**Who it affects:** \n- **Aircraft:** Twin Commander 500, 600, and 700 series planes (also known as Gulfstream/Rockwell/Aerocommander models)\n- **Specific serial numbers:** All aircraft with serial numbers 1 through 1170, **except** serial numbers 1133, 1153, 1156, and 1162\n- **Also excludes:** Model 720 and pressurised versions of the 680F model\n\n**When to comply:** \"Forthwith\" means immediately — no grace period.\n\n**Why it matters:** Fuel pressure gauge vents without proper drainage can lead to fuel leaks, vapour lock, or inaccurate readings. In aviation, fuel system failures can be catastrophic. This AD mandates a fix that the manufacturer (Aero Commander) identified in Service Bulletin No. 78, and which the US FAA also required in their AD 62-8-1.\n\n**The bottom line:** If you own one of these specific Twin Commander aircraft, you must get this vent drain installed before flying again. It's a straightforward mechanical fix with immediate compliance required."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive itself is an installation requirement targeted to a defined set of Twin Commander models and serial numbers. The text shows no indication that it expands or reduces the original applicability or substantive requirement; it prescribes the vent drain installation and points to the Aero Commander service bulletin or FAA AD for technical detail (Applicability; Document; Compliance)."},"complexity_factors":["Narrow, specific applicability by serial number range with four explicit exclusions (clear but requires serial-number checking)","Mandates a single technical modification (low procedural complexity) but does not include the technical steps in the AD itself","Relies on external technical documents (Aero Commander SB No.78 or FAA AD 62-8-1) for the detailed procedure, increasing dependency on outside material","Immediate compliance worded as “Forthwith” (creates potential scheduling pressure for operators)","No quantified estimates of cost, labour or downtime in the AD text (practical complexity for operational planning)"],"plain_english_summary":"This AD mandates immediate installation of a fuel pressure gauge vent drain on specified Twin Commander aeroplanes (Gulfstream/Rockwell/Aero Commander 500, 600 and 700 series, S/Ns 1–1170 except 1133, 1153, 1156, 1162; plus Model 720 and pressurised 680F). Owners/operators must arrange and fund the work and comply using Aero Commander SB No. 78 or FAA AD 62‑8‑1 for technical details. The AD prescribes the requirement but gives no hazard, cost, or exemption details."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-24-fuel-pressure-gauge-vent-drain-installation","history":"/api/acts/ad-ac-24-fuel-pressure-gauge-vent-drain-installation/history","analysis":"/api/acts/ad-ac-24-fuel-pressure-gauge-vent-drain-installation/analysis","conflicts":"/api/acts/ad-ac-24-fuel-pressure-gauge-vent-drain-installation/conflicts","importantCases":"/api/acts/ad-ac-24-fuel-pressure-gauge-vent-drain-installation/important-cases","documents":"/api/acts/ad-ac-24-fuel-pressure-gauge-vent-drain-installation/documents"}}