{"id":"F2006B05414","name":"AD/PA-22/1 - Landing Gear Reinforcement","slug":"ad-pa-22-1-landing-gear-reinforcement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46074,"registerId":"commonwealth-F2006B05414-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-22/1 - Landing Gear Reinforcement","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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Piper PA-22 (Tri-Pacer and Colt) Series Aeroplanes\n\n \n\nAD/PA-22/1 Landing Gear Reinforcement NK\n\nApplicability: Models PA-22 and PA-22-135 except S/Nos. 22-2377, 2379, 2385, 2388, 2389, 2391,\n\n2394 and above.\n\n \n\nDocument: 1. Piper SL No. 124; or\n\n \n\n2. FAA AD 55-7-2.\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\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, targeted safety directive addressing a specific airworthiness issue with a specific aircraft type. It has not expanded beyond its original purpose of mandating landing gear reinforcement for the affected Piper models."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined applicability criteria (model numbers and serial number exceptions)","Simple binary compliance options (two acceptable source documents)","Single, unambiguous compliance deadline ('forthwith')","No cross-references to other legislation or regulations beyond the parent CAR 1998 citation","No conditional logic, exceptions to exceptions, or nested provisions","Standardised AD format with only 4 operative sections (Applicability, Document, Compliance, plus header metadata)"],"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 like a compulsory recall notice, but for aircraft instead of cars.\n\n**What it does:** It requires owners and operators of specific **Piper PA-22 Tri-Pacer and Colt aeroplanes** to reinforce their landing gear. The reinforcement must be done according to either:\n- Piper Service Letter No. 124 (the manufacturer's official technical bulletin), OR\n- FAA AD 55-7-2 (the equivalent American safety order)\n\n**Who it affects:** Owners and operators of Piper PA-22 and PA-22-135 model aircraft, **except** those with specific serial numbers (22-2377, 2379, 2385, 2388, 2389, 2391, 2394 and any aircraft with higher serial numbers). These excluded aircraft were likely built with the fix already incorporated.\n\n**When it must be done:** **Forthwith** — meaning immediately, without delay. This is urgent safety work.\n\n**Why it matters:** Landing gear failures can cause serious accidents during takeoff or landing. This directive addresses a known structural weakness before it causes an incident. Ignoring an AD is illegal and can ground an aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD as supplied sets its scope by model and serial-number exclusions and requires immediate compliance via reference to two external documents. The text does not indicate any amendment or change to that scope from an earlier instrument or original intent; it simply states the coverage and required documents (Applicability; Document; Compliance)."},"complexity_factors":["Limited technical content in instrument itself — relies on external documents for the actual modification steps (Document).","Immediate compliance requirement increases operational urgency and scheduling complexity (Compliance).","Applicability determined by specific serial-number exclusions, including phrasing \"and above\", which may create interpretive ambiguity (Applicability).","Multiple stakeholders involved: regulator sets rule; owners/operators must procure parts and labour and schedule downtime (Applicability; Document; Compliance)."],"plain_english_summary":"This AD requires owners/operators of certain Piper PA‑22/PA‑22‑135 aeroplanes (with specified serial‑number exclusions) to have the landing gear reinforced immediately, by following either Piper Service Letter No. 124 or FAA AD 55‑7‑2. Compliance is compulsory and at the operator’s expense.\n\nThe directive narrows coverage by serial number (creating some interpretive risk over “22‑2394 and above”) and leaves the technical choice to the two referenced documents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-22-1-landing-gear-reinforcement","history":"/api/acts/ad-pa-22-1-landing-gear-reinforcement/history","analysis":"/api/acts/ad-pa-22-1-landing-gear-reinforcement/analysis","conflicts":"/api/acts/ad-pa-22-1-landing-gear-reinforcement/conflicts","importantCases":"/api/acts/ad-pa-22-1-landing-gear-reinforcement/important-cases","documents":"/api/acts/ad-pa-22-1-landing-gear-reinforcement/documents"}}