{"id":"F2006B09215","name":"AD/DHC-8/59 - Bonded Skin Panel Integrity","slug":"ad-dhc-8-59-bonded-skin-panel-integrity","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53063,"registerId":"commonwealth-F2006B09215-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/59 - Bonded Skin Panel Integrity","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\nAD/DHC-8/59 Bonded Skin Panel Integrity 13/98\n\nApplicability: Model DHC-8 Series 100 and 300 aircraft, serial numbers 215 through 341. Requirement: 1. a. Correct the Aircraft Log Book by revising the individual aircraft Modification\n\nLogs in accordance with the instructions detailed in Part A of Section III,\n\nAccomplishment Instructions, of Bombardier Service Bulletin 8-51-2 dated 9 July 1998 or 8-51-2 Revision A dated 19 September 1998.\n\nb. Determine which panels on the affected aircraft require bonding integrity inspections in accordance with the procedures detailed in Part B of Section III, Accomplishment Instructions, of above mentioned service bulletin(s).\n\nc. Revise the Approved Maintenance Plan by incorporating the Bonding Integrity Inspections identified as Task 5500/01 and Task 5700/01 in the Airworthiness Limitations List.\n\n    2. Conduct the initial ultrasonic bond inspection of the panels identified in paragraph 1(b) above, using the procedure specified below:\n\n    For Series 100 aircraft \\- Bombardier document PSM 1-8-7A, Part 5, section 55- 00-01 and/or 57-30-01; and,\n\n    b. For Series 300 aircraft \\- Bombardier document PSM 1-83-7A, Part 5, section 55-00-01 and/or 57-30-01.\n\nNote: Transport Canada AD CF-98-31 refers.\n\nCompliance: 1. Unless already accomplished, before 3 January 1999.\n\n2. At the next convenient maintenance opportunity, but before 30 September 1999\\. This Airworthiness Directive becomes effective on 3 December 1998.\n\nBackground: The manufacturer’s investigation of an operator’s query has revealed inconsistencies between the effectivity tables for the Bond Integrity Inspection (BII) in the non- destructive testing manuals and the modification status record in Aircraft Modification logs. As a result of these inconsistencies, some of the bonded skin panels on affected aircraft are not being inspected under the BII program even though they were manufactured with panels that require a bonding integrity inspection.","sortOrder":0}],"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":4,"scope_assessment":{"changed":false,"description":"The Directive restores and enforces the inspection coverage intended by the manufacturer's manuals by correcting records and mandating inspections for the specified serial-numbered aircraft. It does not expand applicability beyond the identified fleet or introduce new types of inspections; it mandates that operators follow existing Bombardier procedures and update maintenance documentation (Background; Requirements 1–2)."},"complexity_factors":["Cross-reference to several manufacturer documents and service bulletins (Bombardier Service Bulletin 8-51-2; Bombardier PSM documents) increases implementation complexity (Requirement 1(a), Requirement 2).","Limited applicability by serial number (S/N 215–341) requires individual aircraft review and selective action (Applicability).","Administrative work: revising Aircraft Modification Logs and Approved Maintenance Plan entries creates record-keeping and oversight tasks (Requirement 1(a), 1(c)).","Technical demand: ultrasonic bond inspections (NDT) must be performed to manufacturer procedures, requiring trained personnel and equipment (Requirement 2).","Operators must determine which panels require inspection under the service bulletin procedures, introducing discretionary judgement and potential for variability (Requirement 1(b)).","Multiple compliance dates and an effective date impose scheduling and logistic constraints on maintenance planning (Compliance).","Underlying inconsistency between effectivity tables and modification records creates traceability and verification burdens (Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of Bombardier DHC‑8 Series 100 and 300 aeroplanes (serial numbers 215–341) to correct modification logs, identify panels that need bonded-skin integrity checks, add those inspections to the approved maintenance plan, and perform ultrasonic inspections per Bombardier procedures. It responds to inconsistencies between test-manual effectivity tables and aircraft modification records. Operators and their maintenance organisations bear the costs and labour for record updates and nondestructive testing; the AD prescribes specific procedures and compliance deadlines."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific structural inspection gap on defined DHC-8 aircraft. It does not expand beyond the original safety purpose of ensuring bonded skin panel integrity through corrected record-keeping and mandated inspections."},"complexity_factors":["Multiple cross-references to external technical documents (Bombardier Service Bulletin 8-51-2, Transport Canada AD CF-98-31, and specific PSM manual sections)","Conditional applicability limited to specific serial number range (215–341) and two aircraft series","Two-tier compliance structure with different deadlines for paperwork versus physical inspection","Technical terminology requiring aviation maintenance knowledge (Modification Logs, Approved Maintenance Plan, Airworthiness Limitations List, ultrasonic testing procedures)","Nested document references (e.g., 'Part B of Section III, Accomplishment Instructions' of the service bulletin)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Bombardier DHC-8 Series 100 and 300 aircraft (serials 215–341) to correct records and add mandatory bond-integrity inspections for bonded skin panels, after paperwork gaps meant some at‑risk panels were not being checked.  \n\nIt mandates updating logbooks and maintenance plans, then performing ultrasonic inspections of identified bonded panels to prevent glue failure that could cause structural damage or loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-59-bonded-skin-panel-integrity","history":"/api/acts/ad-dhc-8-59-bonded-skin-panel-integrity/history","analysis":"/api/acts/ad-dhc-8-59-bonded-skin-panel-integrity/analysis","conflicts":"/api/acts/ad-dhc-8-59-bonded-skin-panel-integrity/conflicts","importantCases":"/api/acts/ad-dhc-8-59-bonded-skin-panel-integrity/important-cases","documents":"/api/acts/ad-dhc-8-59-bonded-skin-panel-integrity/documents"}}