{"id":"F2005L03586","name":"AD/DHC-8/100 Amdt 2 - Fluorescent Lighting System","slug":"ad-dhc-8-100-amdt-2-fluorescent-lighting-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39184,"registerId":"commonwealth-F2005L03586-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bombardier (Boeing Canada/De Havilland) ","sectionType":"division","heading":"Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes","content":"### Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\n| AD/DHC-8/100 Amdt 2 | Fluorescent Lighting System | 13/2005 |\n| ------------------- | --------------------------- | ------- |\n\n```html\n

Applicability:

DHC-8-102, -103, -106, -201, -202, -301, -311, -314 and -315 aeroplanes, serial numbers 003 to 407, 409 to 412 and 414 to 433 with pre-Hunting interior.

Requirement:

1. Amend the maintenance schedule by incorporating visual inspection tasks for cabin, ceiling and lavatory fluorescent light tube assemblies as introduced by the Temporary Revisions (TR) of the DHC-8 Maintenance Program Manuals specified below:

Aircraft Series

PSM Number

TR Number

Task Number

Task Description

100
200
300

1-8-7
1-82-7
1-83-7

TR MRB-146
TR MRB 2-24
TR MRB 3-155

3320/01

Detailed visual inspection of cabin fluorescent tube assemblies at ‘C’ check

100
200
300

1-8-7
1-82-7
1-83-7

TR MRB-147
TR MRB 2-25
TR MRB 3-156

3320/02

Detailed visual inspection of side-wall fluorescent tube assemblies at ‘C’ check

100
200
300

1-8-7
1-82-7
1-83-7

TR MRB-147
TR MRB 2-25
TR MRB 3-156

3320/03

Detailed visual inspection of lavatory fluorescent tube assemblies at ‘C’ check

2. Ballast part number (P/N) BA08006-1 and BA08006-28-1 shall not be installed on any aeroplane as a replacement part.

Replacement of ballast P/N BA08006-1 with the new ballast P/N BR9000-21 may be achieved in accordance with Bombardier Service Bulletin(SB) 8-33-51 (Modsum 8Q101287) dated 16 August 2002 or later revisions approved by Transport Canada.

\n```\n\n| | Replacement of ballast P/N BA08006-28-1 with the new ballast P/N BR9000-21 may be achieved in accordance with Bombardier SB 8-33-52 (Modsum 8Q101531) dated 15 April 2005 or later revisions approved by Transport Canada. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| | 3. Visually inspect the cabin, ceiling and lavatory fluorescent light tube assemblies (pre-Modsum 8Q101287 and pre-Modsum 8Q101531) in accordance with TRs introduced by Requirement 1. |\n| | Note: Transport Canada AD CF-2004-26R1 refers. |\n| Compliance: | For Requirement 1 - Before 31 January 2006. |\n| | For Requirement 2 - As of the effective date of this amendment. |\n| | For Requirement 3 - At the next ‘C’ check or within 36 calendar months after the effective date of this Amendment, whichever occurs first. |\n| | This Amendment becomes effective on 22 December 2005. |\n| Background: | Transport Canada has advised that numerous reports of fluorescent lamp holder damage due to overheating have been received. The heating results from arcing between the pins of the fluorescent tube and the lamp holder contacts, if the tube is not properly seated during installation. The resultant fumes and traces of visible smoke can be of concern to passengers and crew. |\n| | The original issue of this Directive required amendment of the Maintenance Program Manuals and a visual inspection of the fluorescent lights. |\n| | Amendment 1 did not change any of the requirements of the original issue of this Directive but was issued following advice from Office of Legislative Drafting, Attorney-General’s Department that the original issue of the Directive was incorrectly made and had no legal effect. |\n| | This Amendment amends the applicability to include -301aeroplances and to reduce the serial number range. The Amendment also adds the inspection of lavatory and optional sidelights with ballast, P/N BA08006-28-1, installed. |\n| | The original issue of this Directive became effective on 10 January 2005. |\n| | Amendment 1 of this Directive became effective on 19 January 2005. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n8 November 2005","sortOrder":0},{"sectionNumber":"AD/DHC-8/100 Amdt 2","sectionType":"part","heading":"AD/DHC-8/100 Amdt 2","content":"## AD/DHC-8/100 Amdt 2","sortOrder":1},{"sectionNumber":"Fluorescent Lighting System","sectionType":"part","heading":"Fluorescent Lighting System","content":"## Fluorescent Lighting System","sortOrder":2},{"sectionNumber":"13/2005","sectionType":"part","heading":"13/2005","content":"## 13/2005","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"This Amendment 2 has expanded beyond the original directive's scope. The original only covered certain fluorescent lights, but this amendment: (1) adds the -301 aircraft series to applicability, (2) reduces the serial number range (removing some aircraft), (3) adds inspection requirements for lavatory lights and optional sidelights with specific ballast part numbers, and (4) introduces new replacement part restrictions. The Background section explicitly notes this is a corrective amendment following legal advice that the original issue was 'incorrectly made and had no legal effect' — indicating significant procedural and substantive scope changes."},"complexity_factors":["Multiple aircraft series and serial number ranges with specific exclusions (408, 413)","Cross-references to external documents: Bombardier Service Bulletins, Temporary Revisions to Maintenance Program Manuals, and Transport Canada AD CF-2004-26R1","Technical part numbers and modification summaries (Modsums) that must be tracked","Three separate compliance deadlines with different trigger events","Nested applicability criteria: aircraft series + serial numbers + interior configuration","Amendment history references (original issue, Amendment 1, Amendment 2) explaining evolution of the directive"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of specified Bombardier DHC‑8‑100/200/300 aircraft with pre‑Hunting interiors to update maintenance manuals, prohibit two ballast replacement part numbers, and carry out visual inspections/modifications of cabin, ceiling and lavatory fluorescent light assemblies at the next ‘C’ check or within 36 months. It addresses overheating that can produce smoke/fumes, reducing fire and smoke risk for Australian operators and passengers."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This Amendment changed the instrument's scope compared with the original issue by: (a) amending the applicability to add the -301 aeroplane model and reducing the serial number range; and (b) adding inspection coverage for lavatory lights and optional side‑lights fitted with ballast P/N BA08006-28-1. The net effect is a change in the population of affected aircraft and an expansion of the inspection/ban requirements to cover an additional ballast P/N and associated assemblies."},"complexity_factors":["Narrow applicability: specific DHC-8 submodels and a confined range of serial numbers (multiple contiguous and non-contiguous ranges).","Three discrete requirements with separate compliance deadlines (Requirement 1, 2, 3).","Cross-references to multiple Temporary Revisions (TR MRB numbers) and to two Bombardier Service Bulletins (SB 8-33-51 and SB 8-33-52) and Modsum numbers for the approved replacement procedure.","Multiple part numbers involved (BA08006-1, BA08006-28-1, BR9000-21) and prohibition plus approved replacement route.","Compliance windows vary (immediate effect for the ban, fixed date for manual amendment, next C check or 36 months for the inspection), creating scheduling complexity.","Reliance on later revisions 'approved by Transport Canada' introduces an external approval dependency (some procedural uncertainty)."],"plain_english_summary":"**What this instrument does (mechanically)\n\n- Applies to Bombardier (De Havilland) DHC-8 Series aeroplanes (models DHC-8-102, -103, -106, -201, -202, -301, -311, -314 and -315) with specified serial numbers and with pre‑Hunting interior.\n\n- Requires operators to amend their maintenance programmes to add detailed visual inspection tasks for fluorescent tube assemblies in the cabin, side‑walls and lavatory, using the Temporary Revisions (TRs) to the DHC‑8 Maintenance Program Manuals identified in the Directive (Requirement 1).\n\n- Prohibits installing two specific ballast replacement parts (P/N BA08006-1 and P/N BA08006-28-1) as replacement parts on any affected aeroplane (Requirement 2).\n\n- Allows replacement of the banned ballasts with a new ballast (P/N BR9000-21) in accordance with Bombardier Service Bulletin (SB) 8-33-51 (for BA08006-1) or SB 8-33-52 (for BA08006-28-1), or later revisions approved by Transport Canada.\n\n- Requires a one‑off visual inspection of the fluorescent light tube assemblies that pre‑date the Modsum changes (Requirement 3).\n\n- Sets compliance timing: Requirement 1 must be done before 31 January 2006; Requirement 2 is effective immediately (as of the amendment date); Requirement 3 must be done at the next ‘C’ check or within 36 months of the amendment, whichever is sooner.\n\n**Who is affected\n\n- Primary: operators / maintainers of the listed DHC‑8 aeroplanes with the stated serial numbers and pre‑Hunting interior fittings.\n- Secondary: maintenance organisations that update and carry out the maintenance schedule and perform the inspections and ballast replacements; suppliers of ballast parts.\n\n**Why it matters (official rationale and mechanical effect)\n\n- The Directive (per the Background) responds to reports that some fluorescent lamp holders were overheating because tubes were not fully seated; arcing between tube pins and holder contacts produced heat, fumes and visible smoke that concerned crew and passengers. The prescriptive changes aim to (a) detect damaged lamp holders visually during scheduled maintenance, and (b) stop re‑installing ballasts that are associated with the problem by prohibiting certain part numbers and directing replacement with a newer approved ballast.\n\n**Practical implications, costs and incentives\n\n- Who pays: aircraft operators pay the labour and parts costs for (i) updating maintenance manuals to include the TR tasks, (ii) performing the required visual inspections at the specified intervals or at the next C check, and (iii) replacing prohibited ballast units with the approved BR9000-21 units where necessary.\n\n- Implementation burden: operators must revise their maintenance program documents to incorporate the TR tasks and ensure maintenance staff are trained to perform the detailed visual inspections. This is an administrative and labour cost; there is also potential parts procurement cost and AOG (aircraft on ground) risk if replacements are required and parts are not immediately available.\n\n- Compliance timing creates short‑term pressure: Requirement 1 has a firm deadline (before 31 January 2006) which forces operators to act quickly; Requirement 3 allows some flexibility (next C check or 36 months) but still requires scheduling and recordkeeping.\n\n- Effect on competition and suppliers: banning old ballast P/Ns reduces demand for those legacy parts and increases demand for the approved replacement BR9000-21. Suppliers of the new ballast may see concentrated demand; operators face limited choice for compliant replacement parts (subject to Transport Canada approval of later SB revisions).\n\n- Risk and detection limits: the Directive relies primarily on visual inspection tasks. Visual inspection detects visible damage and signs of overheating but may miss intermittent electrical faults or internal degradation not visible externally. That creates a residual risk unless replaced parts are fitted.\n\n- Delegation and discretion: the Directive requires adherence to specific TRs and Bombardier SBs (or later Transport Canada‑approved revisions). Operators have limited discretion about method — they must use the approved procedures or later approved revisions — but can schedule inspections within the allowed windows (subject to the deadlines).\n\n**Trade‑offs and opportunity costs\n\n- The Directive favours short‑term safety risk reduction through inspections and part replacement at the cost of increased maintenance workload and parts expenditure for operators.\n\n- If operators must withdraw aircraft from service for ballast replacement and parts are scarce, there is an operational cost (flight cancellations, rescheduling) and potential commercial cost to airlines.\n\n- The measure centralises the technical remedy via Bombardier SBs and Transport Canada approval, which reduces variation in repair method but concentrates reliance on the manufacturer and approved suppliers.\n\n**Summarised mechanics with references to the Directive text\n\n- Amendment of maintenance schedules to include TR inspection tasks (Requirement 1).\n- Ban on installing ballast P/N BA08006-1 and P/N BA08006-28-1 (Requirement 2) and permitted replacement method via Bombardier SB 8-33-51 and SB 8-33-52 (replacement to BR9000-21).\n- One‑off visual inspection of pre‑Modsum fluorescent tube assemblies per Requirement 3, with specified compliance dates.\n\n(Background: overheating and arcing between tube pins and lamp holder contacts caused fumes/smoke — prompting the Directive.)"},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-100-amdt-2-fluorescent-lighting-system","history":"/api/acts/ad-dhc-8-100-amdt-2-fluorescent-lighting-system/history","analysis":"/api/acts/ad-dhc-8-100-amdt-2-fluorescent-lighting-system/analysis","conflicts":"/api/acts/ad-dhc-8-100-amdt-2-fluorescent-lighting-system/conflicts","importantCases":"/api/acts/ad-dhc-8-100-amdt-2-fluorescent-lighting-system/important-cases","documents":"/api/acts/ad-dhc-8-100-amdt-2-fluorescent-lighting-system/documents"}}