{"id":"F2014L00670","name":"AD/PHZL/79 Amdt 2 - Propeller Vibration Placard","slug":"ad-phzl-79-amdt-2-propeller-vibration-placard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":91817,"registerId":"commonwealth-F2014L00670-current","compilationNumber":null,"startDate":"2026-04-02","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/79 Amdt 2 | Propeller Vibration Placard | 12/2014 |\n| ----------------- | --------------------------- | ------- |\n\n| Applicability: | This AD applies to Hartzell ( )HC-C2YK-( )( )( )/( )( )7666A-( ) propellers installed on undampered 200 horsepower Lycoming IO-360 engines.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|                | Note 1: These engines can be fitted to but are not limited to Mooney M20E and M20F, Piper PA-28R-200, and Pitts S-1T and S-2A aeroplanes.Note 2: Engine models of this series incorporate no crankshaft dampers unless the third section of the model designation exhibits a numerical digit in its fourth position, i.e. IO-360-A1B6. The digit \"6\" in the fourth position, indicates the incorporation of one 6.3 order and one 8th order counterweights.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Requirement:   | For Normal Category aeroplanes:1. Unless previously accomplished, remove any vibration placard that does not have the following statement and replace it with one that does:“Avoid continuous operationBetween 2000 and 2350 rpm”2. Unless previously accomplished, re-mark the tachometer face or bezel with a red arc for the restricted engine speed range, between 2000 and 2350 rpm.3. Include a copy of this AD with the aeroplane flight manual, if an aeroplane flight manual is carried.For Utility and Aerobatic Category aeroplanes:1. Unless previously accomplished, remove any vibration placard that does not have the following statement and replace it with one that does:“Avoid continuous operationBetween 2000 and 2350 rpm.Above 2600 rpm in aerobatic flight”.2. Unless previously accomplished re-mark the tachometer face or bezel with a red arc for the restricted engine speed range, between 2000 and 2350 rpm, and between 2600 and 2700 rpm (red line). |\n\n|             | 3. Include a copy of this AD with the aeroplane flight manual, if an aeroplane flight manual is carried.                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|             | Note 3: FAA AD 2007-26-09 Amdt 39-15311, paragraph (k) refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| Compliance: | Unless previously accomplished, the required actions for Normal Category aeroplanes and Utility and Aerobatic Category aeroplanes must be taken from the effective date of this AD.Note 4: Compliance with AD/PHZL/79 Amdt 1 constitutes compliance with the equivalent requirement(s) of this AD.                                                                                                                                                                                                                                                                                 |\n|             | The effective date of this AD is 8 June 2014.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| Background: | This AD was originally issued to require placards to be fitted to limit operation of the propeller at certain engine speeds. This will prevent failure of the propeller blade due to vibration. Engine speed limitations were previously published in amendments to the Australian Civil MkI an MkII Flight Manuals.AD/PHZL/79 Amdt 1, which became effective on 7 August 2003, corrected errors relating to the identification of undampered engines.This AD, AD/PHZL/79 Amdt 2, makes reference to the latest FAA AD which encompasses the equivalent requirement(s) of this AD. |\n\n![](image.001.png)  \nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n3 June 2014","sortOrder":0},{"sectionNumber":"AD/PHZL/79 Amdt 2","sectionType":"part","heading":"AD/PHZL/79 Amdt 2","content":"## AD/PHZL/79 Amdt 2","sortOrder":1},{"sectionNumber":"Propeller Vibration Placard","sectionType":"part","heading":"Propeller Vibration Placard","content":"## Propeller Vibration Placard","sortOrder":2},{"sectionNumber":"12/2014","sectionType":"part","heading":"12/2014","content":"## 12/2014","sortOrder":3}],"analysis":{"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment clarifies identification of undampered engines and references the latest FAA AD; it retains the existing placard/tachometer marking requirements but updates applicability and cross‑references (Background; Note 2; Note 3). Effective date set as 8 June 2014; compliance with the prior amendment still counts toward these requirements (Compliance)."},"complexity_factors":["Narrow technical applicability: specific Hartzell propeller model series on undampered 200 hp Lycoming IO‑360 engines (Applicability).","Different obligations by aircraft category: Normal vs Utility/Aerobatic have distinct placard wording and rpm markings (Requirement).","Engine model-identification nuance: undampered status determined by a digit in the engine model code (Note 2).","Multiple specific rpm bands to mark/avoid (2000–2350 rpm; aerobatic additional 2600–2700 rpm range) increasing attention to accuracy (Requirement).","Cross-reference to FAA AD and prior amendment creates dependency on external instrument and prior compliance history (Note 3; Compliance).","Low administrative burden but physical actions required: remove/replace placard, re‑mark tachometer, and include AD copy in AFM if carried (Requirement)."],"plain_english_summary":"**What it does:** This Airworthiness Directive requires fitted propeller vibration placards and tachometer markings for certain Hartzell variable‑pitch propellers on undampered 200 hp Lycoming IO‑360 engines. **Who it affects and why it matters:** Owners/operators of affected aeroplanes (examples listed in the AD) must install specified placard wording and add red arcs on tachometers to avoid continuous operation in defined rpm ranges. The AD’s stated aim is to reduce propeller blade failures caused by vibration (effective 8 June 2014)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: preventing propeller failures through vibration warnings. Amendment 2 merely updates the reference to the corresponding FAA directive and maintains the same safety intent as the original 1979 directive and its 2003 amendment. No scope creep is evident."},"complexity_factors":["Single, discrete subject matter (propeller vibration warnings)","Only 2 main categories of aircraft to consider (Normal vs Utility/Aerobatic)","Minimal defined terms (only specific propeller and engine model numbers)","Straightforward conditional logic: 'Unless previously accomplished, do X'","No cross-references to other legislation beyond a single FAA AD citation","Short document (approximately 400 words of substantive content)","Clear, numbered requirements with explicit compliance dates"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Hartzell variable‑pitch propellers on undampered 200‑hp Lycoming engines (common on Mooney, Piper, Pitts) to add cockpit warnings, mark tachometers, and update flight manuals to warn pilots to avoid specific RPM “danger zones.”  \n\nIt matters because continuous operation in those RPM ranges can cause severe vibration, cracking, or propeller failure, creating a serious risk of engine loss and aircraft accident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-79-amdt-2-propeller-vibration-placard","history":"/api/acts/ad-phzl-79-amdt-2-propeller-vibration-placard/history","analysis":"/api/acts/ad-phzl-79-amdt-2-propeller-vibration-placard/analysis","conflicts":"/api/acts/ad-phzl-79-amdt-2-propeller-vibration-placard/conflicts","importantCases":"/api/acts/ad-phzl-79-amdt-2-propeller-vibration-placard/important-cases","documents":"/api/acts/ad-phzl-79-amdt-2-propeller-vibration-placard/documents"}}