{"id":"F2010L01613","name":"AD/F50/102 - State of Design Airworthiness Directives","slug":"ad-f50-102-state-of-design-airworthiness-directives","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":84195,"registerId":"commonwealth-F2010L01613-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Fokker F50 (F27 Mk 50) Series Aeroplanes","sectionType":"division","heading":"Fokker F50 (F27 Mk 50) Series Aeroplanes","content":"### Fokker F50 (F27 Mk 50) Series Aeroplanes\n\n| AD/F50/102 | State of Design Airworthiness Directives | 12/2010 |\n| ---------- | ---------------------------------------- | ------- |\n\n```html\n

Applicability:

Fokker Aircraft B.V. F27 Mark 050 aeroplanes.

Requirement:

1. Determine the applicability of the Netherlands Airworthiness Directives (AD) listed in Table 1.

2. If it is determined that a Netherlands AD listed in Table 1 is applicable and has not been previously accomplished, perform the actions required by that AD or later EASA-approved revision.

Table 1

Netherlands AD

Issue Date

Title

97-060

30 June 1997

Emergency Lighting Control Panel Placard

94-029

21 February 1994

Circuit Breaker Terminal Bolts

93-130

17 September 1993

Propeller Operating Cylinder Retaining Bolts

92-073

10 July 1992

Fuel (Motive) Flow Tube Assembly

92-072

10 July 1992

Mechanical Fuel Control Unit

92-002

24 January 1992

Honeywell Autopilot Computer Replacement

91-128-2

30 January 1998

Engine Compressor Case Fire Detection Element

91-020

1 March 1991

Alternate Gear Handle & Gust Lock Lever

90-129

9 November 1990

Engine Auto-Feather Unit Torque Sensors

90-105

28 September 1990

Manoeuvering Speed Limitation Placards

\n```\n\n```html\n

Netherlands AD

Issue Date

Title

90-055

18 May 1990

Fuel Drain Tank Vent Sleeve

89-022

13 February 1989

AFCS Altitude Select Mode Wiring

88-086

21 October 1988

Propeller Overspeed Governor Inspection

88-061-2

28 February 1997

Engine Handling Bleed Valve Relay

88-044-2

9 June 1989

Upper Nacelle Brace Struts

88-043

23 June 1988

Cockpit Voice Recorder System Modification

88-041

13 June 1988

Engine Nacelle Hinged Fairing Folding Strut

88-027

11 April 1988

Stall Warning System Modification

88-023

30 March 1988

Right Hinged Cowl Door Air Intake

87-090

7 December 1987

Propeller Attachment Bolts Torque Check

Note 1: Netherlands ADs may be accessed via the internet at the following URL:

http://ad.easa.europa.eu/

Compliance:

If a certificate of airworthiness has not been issued for the aircraft - before issue of the certificate of airworthiness.

If a certificate of airworthiness has been issued for the aircraft - within 60 days after the effective date of this Directive.

This Airworthiness Directive becomes effective on 7 July 2010.

Background:

The Netherlands ADs listed in Table 1 of this Directive require once-only actions for which the compliance date and/or period has passed. CASA has determined that these ADs may be applicable to recently-registered Australian aircraft. This Directive is issued to ensure all State of Design ADs are complied with.

\n```\n\n| | CASA appreciates that, due to date of aircraft manufacture or aircraft configuration and modification status, some of the ADs listed in Table 1 will not be applicable to some aeroplanes. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)\n\nMike Higgins \nDelegate of the Civil Aviation Safety Authority\n\n15 June 2010","sortOrder":0},{"sectionNumber":"AD/F50/102","sectionType":"part","heading":"AD/F50/102","content":"## AD/F50/102","sortOrder":1},{"sectionNumber":"State of Design Airworthiness Directives","sectionType":"part","heading":"State of Design Airworthiness Directives","content":"## State of Design Airworthiness Directives","sortOrder":2},{"sectionNumber":"12/2010","sectionType":"part","heading":"12/2010","content":"## 12/2010","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This Directive stays within its original, stated purpose: to ensure State of Design (Netherlands) airworthiness directives listed in Table 1 are considered and complied with for Australian-registered Fokker F50 (F27 Mk 050) aeroplanes. It does not broaden the regulatory subject matter beyond listing and enforcing those existing State of Design ADs; it simply imports their applicability requirement into Australian regulatory oversight for the affected fleet."},"complexity_factors":["Single simple statutory requirement split into two steps (determine applicability; if applicable, perform the referenced AD actions).","Table 1 lists 21 external Netherlands (State of Design) ADs (multiple external cross‑references).","Conditional compliance timing (two branches): before certificate issue OR within 60 days after effective date."],"plain_english_summary":"**What this instrument does (mechanics)**\n\n- This is an airworthiness directive (AD) that applies to Fokker F27 Mark 050 / Fokker F50 aeroplanes. It lists a set of Netherlands (State of Design) airworthiness directives in Table 1 and requires Australian operators/owners to:\n - **Step 1:** Check whether each Netherlands AD listed in Table 1 applies to their particular aircraft (Requirement 1).\n - **Step 2:** If a listed Netherlands AD does apply and has not already been completed, carry out the actions required by that Netherlands AD or by a later EASA‑approved revision of that AD (Requirement 2).\n- The directive includes a compliance schedule: if no Australian Certificate of Airworthiness has yet been issued for the aircraft, compliance is required before that certificate is issued; if a certificate already exists, compliance must be completed within 60 days of this AD becoming effective (see the “Compliance” paragraph).\n- Table 1 lists the specific Netherlands AD numbers, their issue dates and short titles (21 separate Netherlands ADs spanning 1987–1998). The directive also points to the EASA AD website for source documents (Note 1).\n\n**Who is affected**\n\n- Aircraft owners and operators of Fokker F27 Mark 050 / Fokker F50 aeroplanes registered in Australia or newly registered in Australia.\n- Maintenance organisations and engineers who must determine applicability and carry out the corrective/mandatory work specified in the referenced Netherlands/EASA ADs.\n\n**Why it matters (stated purpose and practical effect)**\n\n- CASA’s stated purpose is to ensure that relevant State of Design (Netherlands) ADs — many of which were once‑only actions whose original compliance periods have passed — are complied with for Australian-registered aircraft (Background paragraph).\n- Practically, the AD imposes on operators the duty to verify applicability and to perform repetitive or once‑only maintenance/modification tasks specified in the referenced ADs if those tasks have not already been done. Those tasks can range from placard changes and inspections to component replacements or inspections.\n\n**Who pays and who decides**\n\n- Owners/operators pay. They pay for the labour, parts, inspections and any necessary downtime to comply with each applicable Netherlands AD.\n- The owner/operator (or their authorised maintenance provider) decides whether a listed Netherlands AD is applicable to a particular aircraft (Requirement 1), but if it is applicable and incomplete they must perform the AD action (Requirement 2). CASA (through this Directive) decides that the listed State of Design ADs must be considered and complied with for Australian aircraft.\n\n**Costs, incentives and implementation trade‑offs**\n\n- Direct costs: maintenance time, replacement parts, shop visits and possible grounding/downtime while work is completed.\n- Verification burden: operators must research the referenced Netherlands/EASA ADs (the directive provides the EASA AD URL) and confirm whether prior compliance has already been recorded for their airframe and configuration.\n- Supply/availability risks: some AD actions reference older components or specific part numbers; sourcing parts or approved modifications for out‑of‑production aircraft can be time‑consuming and costly.\n- Recordkeeping and evidentiary risk: operators must retain proof of compliance to satisfy regulators and future buyers; uncertainty about past work can force re‑work or inspections.\n- Limited discretion: CASA requires compliance where an AD applies; however the operator has discretion in determining applicability (subject to regulatory review), and may rely on EASA‑approved later revisions of a Netherlands AD as an alternative means of compliance (Requirement 2).\n\n**Implementation risks and administrative notes**\n\n- Cross‑reference risk: the AD does not reproduce the technical requirements — it references multiple external Netherlands/EASA ADs (Table 1). Effective compliance requires consulting those source ADs and any subsequent EASA‑approved revisions.\n- Timing: many referenced ADs are once‑only actions whose original compliance dates have passed; CASA’s concern is that recently imported/registered aircraft may not have those actions completed.\n- Practical heterogeneity: because aircraft differ by manufacture date, configuration and modification history, some listed ADs will not be applicable to particular aeroplanes (the directive itself recognises this). Operators must apply aircraft‑specific judgement backed by records or inspections.\n\n**Where to look in the document**\n\n- Requirements: labelled as Requirement 1 and Requirement 2 (mechanical steps to determine applicability and to perform actions).\n- Table 1: lists each Netherlands AD number, issue date and title (the 21 ADs referenced).\n- Compliance paragraph: sets the 60‑day deadline if a Certificate of Airworthiness is already issued, or requires completion before issuing a certificate if not yet issued.\n- Background paragraph: explains CASA’s reason for issuing the Directive (ensuring State of Design ADs are complied with). Note 1 gives the EASA AD website link for the original documents.\n\n(Analyst’s note: statement of purpose is CASA’s — the economic consequences fall on operators in the form of verification and correction costs, plus administrative burden; the directive reduces regulatory uncertainty by formally reminding operators that those historical State of Design ADs must be considered and complied with.)"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard 'State of Design AD' instrument that performs its intended function of incorporating foreign airworthiness directives into Australian law. The scope remains limited to the specific aircraft type and the specific list of Netherlands ADs provided. There is no evidence of scope creep beyond the original purpose of ensuring compliance with overseas safety mandates for this aircraft model."},"complexity_factors":["Simple two-step compliance structure (determine applicability, then perform actions)","Single defined term (State of Design Airworthiness Directives) implicitly defined through context","No nested conditional logic or exceptions to exceptions","Clear tabular format for the 21 referenced Netherlands ADs with dates and titles","Straightforward compliance dates with only two scenarios (pre-certification vs post-certification)","No cross-references to other Australian legislation beyond standard aviation terminology","Limited to one aircraft type (Fokker F50/F27 Mk 050)"],"plain_english_summary":"This rule requires owners and operators of Fokker F50 (F27 Mark 050) aircraft in Australia to check whether 21 listed Netherlands airworthiness directives apply to their aircraft and, if so, to carry out the required safety actions (or later EASA‑approved actions). \n\nIt applies to newly imported aircraft (before issuing a certificate of airworthiness) and existing Australian‑registered F50s (within 60 days of 7 July 2010), ensuring long‑standing safety fixes are implemented."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f50-102-state-of-design-airworthiness-directives","history":"/api/acts/ad-f50-102-state-of-design-airworthiness-directives/history","analysis":"/api/acts/ad-f50-102-state-of-design-airworthiness-directives/analysis","conflicts":"/api/acts/ad-f50-102-state-of-design-airworthiness-directives/conflicts","importantCases":"/api/acts/ad-f50-102-state-of-design-airworthiness-directives/important-cases","documents":"/api/acts/ad-f50-102-state-of-design-airworthiness-directives/documents"}}