{"id":"F2005L03923","name":"AD/PHZL/83 - Propeller Hub Cracks","slug":"ad-phzl-83-propeller-hub-cracks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39742,"registerId":"commonwealth-F2005L03923-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Propellers - Variable Pitch - Hartzell","sectionType":"division","heading":"Propellers - Variable Pitch - Hartzell","content":"### Propellers - Variable Pitch - Hartzell\n\n| AD/PHZL/83 | Propeller Hub Cracks | 1/2006 |\n| ---------- | -------------------- | ------ |\n\n| Applicability: | Hartzell Propeller, Inc., Model HD-E6C-3( ) series propellers with propeller hub part number D-5108-1.Note 1: These propellers may be installed on but not limited to Fairchild Dornier 328-110 and 328-120 series aeroplanes. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Unless previously accomplished replace propeller hub P/N D-5108-1 with propeller hub P/N D-5108-5.Note 2: FAA AD 99-25-05 Amdt 39-11448 refers.                                                                                |\n| Compliance:    | Within 30 days after the effective date of this AD.                                                                                                                                                                            |\n|                | This Airworthiness Directive becomes effective on 19 January 2006.                                                                                                                                                             |\n| Background:    | The actions specified by this AD are intended to prevent severe vibration due to cracks in the propeller hub that could result in propeller blade loss, loss of control, and possible damage to the aeroplane.                 |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n29 November 2005","sortOrder":0},{"sectionNumber":"AD/PHZL/83","sectionType":"part","heading":"AD/PHZL/83","content":"## AD/PHZL/83","sortOrder":1},{"sectionNumber":"Propeller Hub Cracks","sectionType":"part","heading":"Propeller Hub Cracks","content":"## Propeller Hub Cracks","sortOrder":2},{"sectionNumber":"1/2006","sectionType":"part","heading":"1/2006","content":"## 1/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD does not appear to have grown beyond its original purpose. The instrument is tightly focused on one corrective action (replace hub P/N D‑5108‑1 with D‑5108‑5) to mitigate a specific identified hazard (propeller hub cracking). The text does not broaden the scope to other parts, models, or regulatory mechanisms; it instead references an FAA AD for related technical authority. Therefore the scope remains aligned with the stated original intent (prevent hub cracks and resulting vibration/contamination risk)."},"complexity_factors":["Single, narrowly framed action (replace one specific part number with another).","Short document with four clear headings: Applicability, Requirement, Compliance, Background.","One main defined identifier: propeller hub part number D‑5108‑1 (and replacement D‑5108‑5).","Single compliance deadline (30 days) and single remedy — no phased conditions or inspections.","Cross‑reference to an external instrument (FAA AD 99‑25‑05) but no internal nested exceptions or alternative methods of compliance.","No multiple aircraft types listed in applicability (note only examples given), and no fines, appeal process, or exemptions specified."],"plain_english_summary":"If your aircraft has a Hartzell HD‑E6C‑3 propeller with hub P/N D‑5108‑1 (used on types such as Dornier 328‑110/120), you must replace it with hub P/N D‑5108‑5 within 30 days of the AD’s effective date. CASA issued this mandatory replacement to prevent hub cracking that can cause severe vibration or blade loss. Costs for parts, labour and downtime fall to the owner/operator."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific safety defect in a specific aircraft component. The scope remains precisely limited to the identified propeller hub cracking issue."},"complexity_factors":["Extremely short document (under 300 words)","Only 2 defined part numbers (D-5108-1 and D-5108-5)","Single, unambiguous compliance action (replacement)","No cross-references to other legislation (only a reference to related FAA directive for context)","Clear, fixed compliance deadline (30 days)","No conditional logic, exceptions, or nested requirements"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's aviation regulator (CASA) to fix a dangerous defect in aircraft propellers.\n\n**What it does:**\n- Orders owners and operators to replace a specific faulty propeller hub (part number D-5108-1) with a redesigned, safer version (part number D-5108-5)\n- Applies to Hartzell variable-pitch propellers, commonly found on Fairchild Dornier 328 aircraft\n\n**Who it affects:**\n- Airlines and operators flying aircraft with these specific Hartzell propellers\n- Maintenance engineers responsible for propeller upkeep\n\n**Why it matters:**\nCracks were discovered in the original propeller hub design. If left unaddressed, these cracks could cause:\n- Severe vibration during flight\n- Complete loss of a propeller blade\n- Potential loss of aircraft control\n- Possible crash or serious damage\n\n**The bottom line:** This is a \"fix it now\" safety order. Operators have just 30 days from 19 January 2006 to complete the replacement or ground their aircraft."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-83-propeller-hub-cracks","history":"/api/acts/ad-phzl-83-propeller-hub-cracks/history","analysis":"/api/acts/ad-phzl-83-propeller-hub-cracks/analysis","conflicts":"/api/acts/ad-phzl-83-propeller-hub-cracks/conflicts","importantCases":"/api/acts/ad-phzl-83-propeller-hub-cracks/important-cases","documents":"/api/acts/ad-phzl-83-propeller-hub-cracks/documents"}}