{"id":"F2007L03985","name":"AD/BO 105/25 - State of Design Airworthiness Directives","slug":"ad-bo-105-25-state-of-design-airworthiness-directives","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":160767,"registerId":"commonwealth-F2007L03985-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter BO 105 Series Helicopters","sectionType":"division","heading":"Eurocopter BO 105 Series Helicopters","content":"### Eurocopter BO 105 Series Helicopters\n\n| AD/BO 105/25 | State of Design Airworthiness Directives | 11/2007 |\n| ------------ | ---------------------------------------- | ------- |\n\n```html\n

Applicability:

Eurocopter BO 105 helicopters.

Requirement:

1. Determine the applicability of the German Luftfahrt-Bundesamt (LBA) in Table 1 and Transport Canada Aviation (TCA) Airworthiness Directives (AD) listed in Table 2 of this AD.

2. If it is determined that a LBA or TCA AD is applicable and has not been previously accomplished, perform the actions required by that AD.

Table 1

LBA AD

Effective Date

Title

75-103

21 May 1975

Quadruple Nuts - Main Rotor Head

75-106/2

16 June 1975

Hose Assemblies

75-170/2

17 September 1975

Quadruple Nuts and Bolts - Main Rotor Head

75-171

5 August 1975

Power Supply System Connector Plugs

75-191/2

1 October 1975

Load hook Release Wiring

75-238

27 October 1975

Right Outboard Engine Mount Flange

76-136/2

5 October 1978

Gearbox Supports - Service Life

76-255/2

4 October 1976

Dual Hydraulic Booster

76-256/3

19 February 1980

Rotor Brake

77-306

12 December 1977

Input Shaft and Ram Air Ventilation

78-257

18 October 1978

Dual Hydraulic System Selector Valves

78-295/2

21 January 1980

Tail Rotor Blades and Tail Rotor Heads

79-135

20 March 1979

Main Rotor Transmission Bearings

79-136

14 March 1979

Exhaust Pipe Clamps

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

79-137

16 March 1979

Drive Shaft Fairing - Asbestos Cloth

79-234

17 May 1979

Tail Rotor Control Linkage

79-235/2

18 October 1979

Dual Hydraulic Booster System

79-444

17 October 1979

Engine Cowling Fire Protection Paint

80-95/2

11 June 1980

Bendix Drive Shaft

80-208

27 August 1980

Main Gearbox Freewheel Shaft

83-124/2

30 October 1984

Tandem Hydraulic Units

84-128

6 August 1984

Tail Rotor Blades

84-177/2

14 January 1984

Cargo Hook

84-178

5 November 1984

Vertical Fin

85-50

18 February 1985

Control Rods

Table 2

TCA AD

Effective Date

Title

CF-91-41

1 February 1992

Torque Indication Hose

CF-93-06

30 April 1993

Continuous Ignition System

Note: LBA ADs can be accessed at the following URLs:

http://www2.lba.de/dokumente/ad/html/ads-eurocopter/3025-bo105.htm

http://www2.lba.de/dokumente/ad/html/ads-eurocopter/3058-bo-105-lsa3.htm

TC ADs can be accessed at the following URL:

http://www.tc.gc.ca/aviation/applications/cawis-swimn/awd-lv-cs1401.asp?rand

Compliance:

For Requirement 1 - Within 30 days after the effective date of this AD or prior to the issue of a certificate of airworthiness, whichever occurs later.

For Requirement 2 - Within 12 months from the effective date of this Directive.

This Airworthiness Directive becomes effective on 25 October 2007.

\n```\n\n| Background: | The LBA and TCA ADs listed in Table 1 and 2 of this Directive require one time 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![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n29 August 2007","sortOrder":0},{"sectionNumber":"AD/BO 105/25","sectionType":"part","heading":"AD/BO 105/25","content":"## AD/BO 105/25","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":"11/2007","sectionType":"part","heading":"11/2007","content":"## 11/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive does not create new technical obligations beyond requiring compliance with existing State‑of‑Design ADs; it extends enforcement to recently registered Australian aircraft where those ADs' original compliance dates have passed (see Background and Requirements 1–2). It mandates applicability checks and completion of listed LBA/TCA AD actions within the stated timeframes but does not broaden the types of actions required by the original foreign ADs."},"complexity_factors":["Cross‑references numerous foreign ADs (LBA and TCA) listed in Table 1 and Table 2 — requires locating and interpreting external directives.","Many referenced ADs have historical effective dates (1975–1993) so operators must review legacy maintenance records to determine prior compliance.","Two distinct procedural requirements with different deadlines: determine applicability within 30 days or before issue of a certificate of airworthiness (Requirement 1) and complete applicable AD actions within 12 months (Requirement 2).","Administrative burden to access foreign AD texts (URLs provided in the Directive) and to evidence compliance to CASA.","Potential variable physical work if an AD was not previously accomplished (inspections, replacements or modifications) — costs and downtime depend on aircraft condition and specific AD.","Limited regulatory discretion: if a listed State‑of‑Design AD is applicable and not previously accomplished, the operator must perform the actions specified by that foreign AD."],"plain_english_summary":"Requires operators of Eurocopter BO 105 helicopters to check whether the listed German (LBA) and Canadian (TCA) airworthiness directives apply to their aircraft and, if so, to carry out the actions those foreign ADs require. It targets owners/operators and organisations issuing certificates of airworthiness, ensuring historical State‑of‑Design ADs (with past compliance dates) are captured for recently registered Australian aircraft and completed within set timeframes."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD maintains its original scope as a 'State of Design' directive. Its purpose has always been to 'catch up' Australian-registered aircraft with historical safety notices from the country of manufacture. The document does not expand beyond this original intent; it simply lists the specific foreign ADs that must be checked and complied with."},"complexity_factors":["Incorporation by reference of 27 external foreign regulatory instruments (25 German LBA ADs and 2 Canadian TCA ADs) without reproducing their full text","Two-tier compliance structure with different deadlines for assessment (30 days) versus action (12 months)","Conditional applicability logic ('if determined applicable and not previously accomplished')","Requires cross-referencing against aircraft maintenance records to determine 'previously accomplished' status","Nested tabular data with historical effective dates spanning 1975–1993","External URL dependencies for accessing full text of incorporated foreign ADs"],"plain_english_summary":"This CASA Airworthiness Directive requires owners, operators and maintenance organisations of Eurocopter BO 105 helicopters in Australia to verify whether 27 specified foreign safety notices (from Germany and Canada) apply to their aircraft and to carry out any outstanding inspections, repairs or modifications. It ensures recently imported or previously-operated overseas helicopters meet historical safety requirements for critical systems, preventing accidents from known defects."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bo-105-25-state-of-design-airworthiness-directives","history":"/api/acts/ad-bo-105-25-state-of-design-airworthiness-directives/history","analysis":"/api/acts/ad-bo-105-25-state-of-design-airworthiness-directives/analysis","conflicts":"/api/acts/ad-bo-105-25-state-of-design-airworthiness-directives/conflicts","importantCases":"/api/acts/ad-bo-105-25-state-of-design-airworthiness-directives/important-cases","documents":"/api/acts/ad-bo-105-25-state-of-design-airworthiness-directives/documents"}}