{"id":"F2006L02877","name":"AD/PHS/24 Amdt 1 - Propeller System Actuator Yoke Arms","slug":"ad-phs-24-amdt-1-propeller-system-actuator-yoke-arms","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":60126,"registerId":"commonwealth-F2006L02877-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Propellers - Variable Pitch - Hamilton S","sectionType":"division","heading":"Propellers - Variable Pitch - Hamilton Standard","content":"### Propellers - Variable Pitch - Hamilton Standard\n\n| AD/PHS/24 Amdt 1 | Propeller System Actuator Yoke Arms | 10/2006 |\n| ---------------- | ----------------------------------- | ------- |\n\n| Applicability: | Hamilton Sundstrand Model 14RF-19 propellers with propeller system actuator yoke arms, part number (P/ N) 810436-2, which might be installed in actuator assemblies P/N 790199-6.Note 1: These propellers are installed on, but not limited to, SAAB 340 aeroplanes.                                                                                                                                                                                                                                                                                                                                                         |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Replace all actuator yoke arms, P/N 810436-2 with improved actuator yoke arms, P/N 810436-3 in accordance with the Accomplishment Instructions of Hamilton Sundstrand Service Bulletin 14RF-19-61-113, Revision 1, dated 2 September 2003 or later FAA approved revisions.2. Mark newly installed actuators in accordance with the Accomplishment instructions of Hamilton Sundstrand Service Bulletin 14RF-19-61-113, Revision 1, or later FAA approved revisions.3. Do not install any actuator yoke arms, P/N 810436-2, into any propeller assembly.Note 2: FAA AD 2006-16-01 Amdt 39-14701 dated 24 July 2006 refers. |\n| Compliance:    | 1. Within 60 days after the effective date of this AD, unless previously accomplished.2. Within 60 days after the effective date of this AD, unless previously accomplished.3. From the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                           |\n|                | This Amendment becomes effective on 28 September 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| Background:    | This AD results from propeller system actuator yoke arms breaking during flight. The requirements of this AD are intended to prevent actuator yoke arms breaking during flight, which could cause high propeller vibration and contribute to reduced controllability of the aeroplane.This amendment corrects an error in the applicability section of the AD, where the actuator assembly was given the wrong P/N.                                                                                                                                                                                                          |\n\n|     | The original issue of the AD became effective on 3 August 2006. |\n| --- | --------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n14 August 2006","sortOrder":0},{"sectionNumber":"AD/PHS/24 Amdt 1","sectionType":"part","heading":"AD/PHS/24 Amdt 1","content":"## AD/PHS/24 Amdt 1","sortOrder":1},{"sectionNumber":"Propeller System Actuator Yoke Arms","sectionType":"part","heading":"Propeller System Actuator Yoke Arms","content":"## Propeller System Actuator Yoke Arms","sortOrder":2},{"sectionNumber":"10/2006","sectionType":"part","heading":"10/2006","content":"## 10/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment corrects a typographical error in the original AD (wrong part number for the actuator assembly). It does not expand the scope beyond the original safety purpose of preventing yoke arm failures."},"complexity_factors":["Single, specific mechanical defect addressed with clear part numbers","Only 3 straightforward requirements (replace, mark, don't install)","Simple compliance timeline (60 days or immediate)","Minimal cross-referencing (only to manufacturer's service bulletin and related FAA directive)","No nested conditions, exceptions, or defined terms section","Narrow applicability (one propeller model, one specific part number)"],"plain_english_summary":"This AD mandates that operators of SAAB 340 aircraft with Hamilton Sundstrand Model 14RF-19 propellers address a defective actuator yoke arm (P/N 810436-2) that has failed in flight. It requires installing the improved yoke arm (P/N 810436-3), marking the parts, and prohibits further use of the old parts.\n\nThe work had to be completed within 60 days of 28 September 2006. The measure is legally mandatory because failures cause severe vibration and control loss."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The amendment corrects an error in the original AD's applicability by fixing the actuator assembly part number. Mechanically, the substantive safety requirements (replace P/N 810436-2 with P/N 810436-3, mark replacements, and prohibit installation of P/N 810436-2) remain in force but the set of affected units/operators is clarified. The change narrows/clarifies who must comply by specifying the correct part numbers (Background)."},"complexity_factors":["Technical specificity: mandates replacement of a single, precisely identified part (P/N 810436-2 → P/N 810436-3), increasing precision required in maintenance and inventory control (Requirement).","Mandatory short timeframe: two compliance actions required 'within 60 days' of the AD effective date, creating scheduling and logistics pressure for operators (Compliance).","Dependence on external documents: requires work 'in accordance with' Hamilton Sundstrand Service Bulletin 14RF-19-61-113 Revision 1 or later FAA‑approved revisions, so operators must obtain and follow that SB and any FAA approvals (Requirement).","Traceability obligation: newly installed actuators must be marked per the service bulletin, adding a record-keeping step and inspection point (Requirement).","Installation prohibition: explicit ban on installing the old P/N into any propeller assembly from the effective date, affecting parts stocking and supply decisions (Requirement/Compliance).","Scope correction: the amendment fixes an earlier wrong part number in the applicability, which changes which units/operators are captured by the AD (Background).","Operational impact: potential aircraft downtime and replacement costs borne by aircraft operators and maintenance organisations; supply-chain implications if improved parts are limited (implied by Replacement requirement)."],"plain_english_summary":"This amendment requires operators of Hamilton Sundstrand Model 14RF-19 propellers (commonly fitted to SAAB 340 aircraft) to replace actuator yoke arms P/N 810436-2 with improved P/N 810436-3, mark the new actuators, and prohibits reinstalling the old part. Compliance is required within 60 days. The rule aims to prevent in‑flight yoke arm failures that cause high propeller vibration and reduced controllability, and it corrects an earlier error in the part‑number applicability."},"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-phs-24-amdt-1-propeller-system-actuator-yoke-arms","history":"/api/acts/ad-phs-24-amdt-1-propeller-system-actuator-yoke-arms/history","analysis":"/api/acts/ad-phs-24-amdt-1-propeller-system-actuator-yoke-arms/analysis","conflicts":"/api/acts/ad-phs-24-amdt-1-propeller-system-actuator-yoke-arms/conflicts","importantCases":"/api/acts/ad-phs-24-amdt-1-propeller-system-actuator-yoke-arms/important-cases","documents":"/api/acts/ad-phs-24-amdt-1-propeller-system-actuator-yoke-arms/documents"}}