{"id":"F2017L01363","name":"AD/DHC-8/34 Amdt 2 - Black Thermal Insulation","slug":"ad-dhc-8-34-amdt-2-black-thermal-insulation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":144173,"registerId":"commonwealth-F2017L01363-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bombardier DHC-8 Series Aeroplanes","sectionType":"part","heading":"Bombardier DHC-8 Series Aeroplanes","content":"# Bombardier DHC-8 Series Aeroplanes\n\n| AD/DHC-8/34 Amdt 2 | Black Thermal Insulation | 21/2017 |\n| ------------------ | ------------------------ | ------- |\n\n```html\n

Applicability:

Bombardier DHC-8 aircraft, with models and serial numbers as listed in the Requirement Table.

Requirement:

Remove all black film thermal insulation blankets from the aircraft fuselage and flight compartment and replace them with AN4C Aluminized (silver) film insulation blankets; in accordance with the Part III Accomplishment Instructions of the Bombardier Inc., de Havilland Dash 8 Service Bulletins listed in the following table:

DHC-8 Models

Serial Numbers

Service Bulletin Numbers

102, 103, & 106

003 to 353

8-25-89 as in force from time to time

102, 103, & 106

003 to 371

8-25-90 as in force from time to time

102, 103, 106, 301, 311, & 314

003 to 337, 339, 341 to 347, 349, 350, 351, 353, & 356

8-25-91 as in force from time to time

301, 311, & 314

100 to 336, 342, 350, & 356

8-25-92 as in force from time to time

301, 311, & 314

100 to 336, 342, 350, 356, 365, & 370

8-25-93 as in force from time to time

Note 1: Transport Canada AD CF-94-08R1 refers.

Note 2: This Directive is not applicable to aircraft that have had all three de Havilland Modifications 8/2004, 8/2006, and 8/2007 incorporated during manufacture.

Note 3: The words “as in force from time to time” require compliance with the most recent version of the referenced document.

Compliance:

Unless already accomplished in accordance with the previous issue of this Directive, prior to 26 November 2017 or as indicated in Part 1.D of the service bulletins listed in the Requirement Table, whichever occurs later.

Note 4: Previous compliance with the requirement in AD/DHC-8/34 Amdt 1 constitutes compliance with the requirement in this AD.

This AD commences on 26 October 2017.

Background:

Operators have reported corrosion forming on areas of the aircraft where black film thermal insulation blankets are being used. De Havilland’s investigation found that the black film, which covers these insulation blankets, contains carbon. If condensation is present, corrosion may occur in places where the black film is in contact with any aluminium structure.

Amendment 1 of this AD was issued in response to a revision of the Transport Canada AD which changed the applicability to align with the applicability of the latest revision of the mandated service bulletins.

Amendment 2 of this AD is issued to correct two minor typographical errors in the serial number range of the last row of the Requirement Table.

\n```\n\n![](image.001.jpeg)\n\nPieter van Dijk \nDelegate of the Civil Aviation Safety Authority\n\n16 October 2017","sortOrder":0},{"sectionNumber":"AD/DHC-8/34 Amdt 2","sectionType":"part","heading":"AD/DHC-8/34 Amdt 2","content":"## AD/DHC-8/34 Amdt 2","sortOrder":1},{"sectionNumber":"Black Thermal Insulation","sectionType":"part","heading":"Black Thermal Insulation","content":"## Black Thermal Insulation","sortOrder":2},{"sectionNumber":"21/2017","sectionType":"part","heading":"21/2017","content":"## 21/2017","sortOrder":3}],"analysis":{"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":3,"scope_assessment":{"changed":false,"description":"This remains a targeted safety directive addressing a specific technical defect in specific aircraft models. Amendment 2 merely corrects typographical errors in serial number ranges from Amendment 1; it does not expand the scope beyond the original corrosion prevention purpose."},"complexity_factors":["Multiple model and serial number combinations create a matrix of applicability (6 model variants across multiple serial number ranges)","References to external technical documents (5 different service bulletins) that are 'as in force from time to time' — meaning the latest version always applies","Conditional exemption for aircraft with three specific factory modifications already installed","Cross-reference to Canadian aviation safety regulation (Transport Canada AD CF-94-08R1)","Specific compliance deadline with alternative timing based on service bulletin requirements","Amendment history (Amendment 2) indicates iterative corrections to serial number ranges"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of specified Bombardier DHC‑8 (Dash 8) aircraft to remove black‑film thermal insulation blankets and replace them with silver AN4C aluminized blankets to stop moisture‑induced corrosion of aluminium structure. It applies to certain model/serial ranges, must be completed by the stated compliance date or per the referenced service bulletins, and exempts aircraft with three named factory modifications."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Amendment history altered applicability from the original issue. Amendment 1 revised the AD’s applicability to align with a Transport Canada AD and the mandated service bulletin applicability (Background). Amendment 2 does not expand the technical requirement but corrects typographical errors in the serial-number ranges of the Requirement Table; the current AD therefore retains the revised applicability introduced earlier while fixing those typographical mistakes (Background; Requirement Table; Note 3)."},"complexity_factors":["Detailed model and serial-number ranges across multiple table rows requiring precise applicability tracking (Applicability).","Mandatory compliance with multiple Bombardier service bulletins and their latest revisions — phrasing “as in force from time to time” imposes an ongoing obligation to monitor updates (Requirement; Note 3).","Dual compliance trigger: a fixed calendar deadline and alternative timing tied to Part 1.D of the service bulletins, creating conditional scheduling complexity (Compliance).","Exception for aircraft with specific De Havilland modifications, requiring operators to verify modification status (Note 2).","Remedial work is physical removal and replacement of insulation blankets, imposing parts, labour, downtime and certification/recordkeeping tasks (Requirement).","Cross-reference to Transport Canada AD and reliance on manufacturer accomplishment instructions mean coordination across regulator and OEM material (Note 1; Background).","Amendment history affects applicability: Amendment 1 changed applicability to align with Transport Canada; Amendment 2 corrects typographical errors, so regulatory history must be checked (Background)."],"plain_english_summary":"This directive requires operators of specified Bombardier DHC‑8 aircraft to remove black-film thermal insulation from the fuselage and flight compartment and replace it with AN4C aluminized (silver) film insulation, following the referenced Bombardier service bulletins. It applies to aircraft identified by model and serial-number ranges and excludes aircraft fitted with De Havilland Mods 8/2004, 8/2006 and 8/2007 (Requirement; Applicability; Note 2).\n\nThe stated aim is to prevent aluminium corrosion where carbon-containing black film contacts structure when condensation occurs (Background). Operators bear parts, labour and downtime costs and must comply by 26 November 2017 or as set in the service bulletins; the AD requires using the latest bulletin versions where it says “as in force from time to time” (Compliance; Note 3)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-34-amdt-2-black-thermal-insulation","history":"/api/acts/ad-dhc-8-34-amdt-2-black-thermal-insulation/history","analysis":"/api/acts/ad-dhc-8-34-amdt-2-black-thermal-insulation/analysis","conflicts":"/api/acts/ad-dhc-8-34-amdt-2-black-thermal-insulation/conflicts","importantCases":"/api/acts/ad-dhc-8-34-amdt-2-black-thermal-insulation/important-cases","documents":"/api/acts/ad-dhc-8-34-amdt-2-black-thermal-insulation/documents"}}