{"id":"F2006B09787","name":"AD/F28/52 Amdt 1 - Rudder Pedal Adjustment Mechanism Stops","slug":"ad-f28-52-amdt-1-rudder-pedal-adjustment-mechanism-stops","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54706,"registerId":"commonwealth-F2006B09787-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/52 Amdt 1 - Rudder Pedal Adjustment Mechanism Stops","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)  Fokker F28 Series Aeroplanes\n\n \n\nAD/F28/52\n\nAmdt 1\n\n\nRudder Pedal Adjustment Mechanism Stops 7/88\n\n \n\nApplicability: All model F28 with S/Nos 11003 to 11224 inclusive, 11226, 11991 and 11992. Requirement:               Action in accordance with Fokker SB F28/27-158 Revision 1.\n\nNote: RLD AD 85-78 refers.\n\n \n\nCompliance: Prior to 1 September 1986.\n\n \n\nBackground: The possibility exists of insufficient rudder deflection when the rudder pedals are adjusted to the maximum forward position. This Directive requires the installation of stops in the adjustment mechanism. Amdt 1 reflects Revision 1 to the SB which removes S/Nos 11225, 11227 through 11231 from the Applicability listing.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amdt 1 changes the scope of affected aircraft by removing certain serial numbers from the Applicability list. The AD as amended applies to S/Nos 11003 to 11224 inclusive, 11226, 11991 and 11992; Amdt 1 \"reflects Revision 1 to the SB which removes S/Nos 11225, 11227 through 11231 from the Applicability listing.\" This narrows the set of aircraft required to comply compared with the earlier applicability list. [Applicability]; [Amdt 1 reflects Revision 1 to the SB]"},"complexity_factors":["Cross-reference to an external technical document (Fokker SB F28/27-158 Revision 1) — the AD delegates technical detail to that service bulletin","Serial-number-based applicability list (requires checking airframe serials against the listed range and discrete numbers)","Amendment that removes specific serial numbers from applicability (requires tracking of changes between versions)","Short, time-bound compliance requirement (a fixed deadline is specified)","Technical subject-matter (aircraft control mechanism), which is simple in directive form but requires specialist maintenance capability to implement"],"plain_english_summary":"This AD requires installation of stops in the rudder‑pedal adjustment mechanism on specified Fokker F28 aircraft, to be carried out per Fokker Service Bulletin F28/27‑158 Revision 1, addressing a risk of insufficient rudder deflection when pedals are fully forward.  \n\nIt applies only to the listed serial numbers (the amendment narrowed that list), was mandatory by 1 September 1986, and imposes one‑time parts, labour and downtime costs on the affected owners/operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, specific safety purpose. Amendment 1 slightly reduced the scope by removing certain serial numbers from applicability, but this is a routine technical correction rather than scope creep. The instrument remains tightly focused on its original purpose: ensuring rudder pedal adjustment mechanisms have proper stops installed."},"complexity_factors":["Very short document (approximately 150 words)","Only 3 substantive sections: Applicability, Requirement, and Compliance","Single technical requirement referencing an external service bulletin","Simple conditional logic (specific serial number ranges only)","No defined terms section or complex cross-referencing within the instrument itself","One amendment (Amdt 1) with straightforward scope reduction (removing serial numbers)"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners/operators of certain Fokker F28 series aeroplanes to install physical stops in the rudder pedal adjustment mechanism. These stops prevent the rudder pedals from being adjusted too far forward, which could otherwise limit rudder deflection (the ability to move the rudder left or right) and compromise aircraft control.\n\n**Who it affects:** Operators of Fokker F28 aircraft with specific serial numbers: 11003 through 11224, plus 11226, 11991, and 11992. Notably, Amendment 1 removed serial numbers 11225 and 11227-11231 from the original requirement.\n\n**Why it matters:** Without this fix, pilots adjusting their rudder pedals to the maximum forward position might not have full rudder authority — a serious safety risk during takeoff, landing, or emergency situations. The directive references a Fokker Service Bulletin (SB F28/27-158 Revision 1) that provides the technical instructions for the modification.\n\n**Compliance deadline:** The work had to be completed before 1 September 1986 (now historical)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-52-amdt-1-rudder-pedal-adjustment-mechanism-stops","history":"/api/acts/ad-f28-52-amdt-1-rudder-pedal-adjustment-mechanism-stops/history","analysis":"/api/acts/ad-f28-52-amdt-1-rudder-pedal-adjustment-mechanism-stops/analysis","conflicts":"/api/acts/ad-f28-52-amdt-1-rudder-pedal-adjustment-mechanism-stops/conflicts","importantCases":"/api/acts/ad-f28-52-amdt-1-rudder-pedal-adjustment-mechanism-stops/important-cases","documents":"/api/acts/ad-f28-52-amdt-1-rudder-pedal-adjustment-mechanism-stops/documents"}}