{"id":"F2006L02289","name":"AD/DHC-8/126 - Spoiler Cable Disconnect Sensing System","slug":"ad-dhc-8-126-spoiler-cable-disconnect-sensing-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":117614,"registerId":"commonwealth-F2006L02289-current","compilationNumber":null,"startDate":"2026-04-03","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-8/126 | Spoiler Cable Disconnect Sensing System | 8/2006 |\n| ------------ | --------------------------------------- | ------ |\n\n| Applicability: | DHC-8 Models 102, 103, 106, 201, 202, 301, 311, 314 and 315 aircraft, serial numbers (S/N) 003 through 599 inclusive. |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. For aircraft S/N 124, 131, 137 and 140 through 561 inclusive - Incorporate Modsum 8Q100898 to install the spoiler cable disconnect sensing device. Bombardier Service Bulletin 8-27-89, Revision E, dated 27 January 2005, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada, provides approved instructions for incorporating Modsum 8Q100898 (See Note 2). |\n| | 2. For aircraft S/N 003 through 123 inclusive, 125 through 130 inclusive, 132 through 136 inclusive, 138 and 139 - Incorporate Modsums 8Q100898 and 8Q101443 to install the spoiler cable disconnect sensing device and to correct potential spoiler cable interference condition. Bombardier Service Bulletin8-27-89, Revision E, dated 27 January 2005, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada, provides approved instructions for incorporating Modsums 8Q100898 and 8Q101443 (See Notes 2 and 3). |\n| | 3. For aircraft S/N 003 through 599: |\n| | a. Incorporate Modsum 8Q101445 to rework the spoiler cable disconnect sensing circuit. Bombardier Service Bulletin 8-27-103, Revision A, dated 12 February 2004, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada, provides approved instructions for incorporating Modsum 8Q101445 (See Note 4). |\n| | b. If Modsum 8Q100898 has not yet been incorporated, incorporate Modsum 8Q101445 in conjunction with Modsum 8Q100898 (refer to Requirements 1 and 2 of this Directive, as applicable) (See Note 4). |\n\n| | Note 1: The mandatory operational check requirement for the spoiler cable disconnect system (Modsum 8Q100898) is detailed in Part 2 of Maintenance Program Manual, Airworthiness Limitations (AWL), Task Number 2760/14. It was introduced by Temporary Revisions AWL-88 (Series 100), AWL 2-28 (Series 200) and AWL-3-95 (Series 300), all dated 5 August 2004. Temporary Revision AWL-88 (Task Number 2760/14) has since been incorporated in Revision 17 of Part 2, AWL's, dated 19 April 2005, of the Series 100 Maintenance Program Manual. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | Note 2: Installation of Modsum 8Q100898, in accordance with the original issue, Revision A, B, C or D of Bombardier Service Bulletin 8-27-89, prior to the effective date of the Directive, is considered acceptable for compliance with Requirements 1 and 2 for installation of this particular Modsum. |\n| | Note 3: Installation of Modsum 8Q101443, in accordance with Revision C or D of Bombardier Service Bulletin 8-27-89, prior to the effective date of the Directive, is considered acceptable for compliance with Requirement 2 for installation of this particular Modsum. |\n| | Note 4: Installation of Modsum 8Q101445, in accordance with the original issue of Bombardier Service Bulletin 8-27-103, prior to the effective date of the Directive, is considered acceptable for compliance with Requirement 3 for installation of this particular Modsum. |\n| | Note 5: Transport Canada AD CF-2006-13 refers. |\n| Compliance: | For Requirements 1, 2 and 3 - Within 24 months after the effective date of this Directive. |\n| | This Airworthiness Directive becomes effective on 3 August 2006. |\n| Background: | Bombardier Aerospace identified that a roll spoiler cable failure could result in an unacceptable amount of roll spoiler deflection, which could result in reduced controllability of the aircraft. To address this condition, Modsum 8Q100898 was issued to introduce a spoiler cable disconnect sensing device. This modification has been installed in production on aircraft serial numbers 562 and subsequent. An associated operational check has also been introduced (See Note 1).In addition, Modsum 8Q101443 was issued to address a potential spoiler cable interference condition on aircraft S/N 003 through 123, 125 through 130, 132 through 136, 138 and 139, which do not yet have a spoiler cable tension regulator (Mod 8/0708) installed. |\n\n| | Following incorporation of the spoiler cable disconnect sensing device on several aircraft, it was noted that, in the event of a spoiler cable failure, only the ROLL SPLR INBD HYD caution light will be illuminated until the aircraft speed decreases below 135 kts, at which time the ROLL SPLR OUTBD HYD caution light will also be illuminated. Modsum 8Q101445 has been issued to rework the sensing circuit caution light indication to ensure that it is consistent for spoiler cable disconnects above and below 135 kts. This modification has been installed in production on aircraft serial numbers 600 and subsequent. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n22 June 2006","sortOrder":0},{"sectionNumber":"AD/DHC-8/126","sectionType":"part","heading":"AD/DHC-8/126","content":"## AD/DHC-8/126","sortOrder":1},{"sectionNumber":"Spoiler Cable Disconnect Sensing System","sectionType":"part","heading":"Spoiler Cable Disconnect Sensing System","content":"## Spoiler Cable Disconnect Sensing System","sortOrder":2},{"sectionNumber":"8/2006","sectionType":"part","heading":"8/2006","content":"## 8/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The directive sticks to the stated safety objective: it mandates specified modifications and an AWL check for the listed DHC‑8 serial numbers to address spoiler cable failure and caution‑light inconsistencies. It confines requirements to the identified fleet and accepts certain earlier installations as compliant; it does not expand obligations beyond those serial numbers or the identified technical issues."},"complexity_factors":["Multiple overlapping serial‑number ranges with different required mods (S/N 003–599 with subranges for different Modsum requirements)","Three separate Modsum actions (8Q100898, 8Q101443, 8Q101445) with conditional dependencies","Mandatory operational check introduced in the Airworthiness Limitations (AWL) and referenced Temporary Revisions","Acceptance of various prior service bulletin revisions as compliant (Notes 2–4) creates revision‑tracking obligations","Single 24‑month compliance timeframe for all requirements regardless of production differences","Interplay between hardware change and caution‑light behaviour tied to airspeed (operational/safety implications)","Cross‑reference to Transport Canada AD CF‑2006‑13 increases regulatory linkage"],"plain_english_summary":"This directive requires operators of Bombardier DHC‑8 series aeroplanes (serial numbers 003–599, with specified subranges) to install a spoiler cable disconnect sensing device (Modsum 8Q100898), corrective hardware for certain early serials (Modsum 8Q101443), and a sensing‑circuit rework (Modsum 8Q101445), all within 24 months. It responds to identified roll‑spoiler cable failure risks and inconsistent caution‑light indications; aircraft owners/operators must fund and carry out the modifications and the mandated operational checks using the referenced Bombardier service instructions."},"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 Airworthiness Directive maintains its original scope as a targeted safety mandate for specific DHC-8 aircraft. The serial number groupings and phased modification requirements reflect the technical reality of different aircraft configurations in service, not scope creep. The directive addresses a single safety issue (spoiler cable disconnect sensing) with necessary variations for different production standards."},"complexity_factors":["Multiple serial number ranges with different modification requirements (3 distinct groups with overlapping and distinct requirements)","Cross-references to external technical documents (Bombardier Service Bulletins 8-27-89 and 8-27-103) that are not reproduced in the directive","Nested conditional logic: Requirement 3(b) refers back to Requirements 1 and 2 with 'as applicable' qualifier","5 detailed notes providing alternative compliance paths for work done prior to the directive's effective date","Technical aviation terminology requiring specialised knowledge (Modsums, spoiler cables, roll spoilers, caution light circuits)","Dual regulatory reference system (references Transport Canada AD CF-2006-13, indicating this adopts a Canadian directive)"],"plain_english_summary":"This mandatory CASA Airworthiness Directive affects Bombardier DHC‑8 (Dash 8) Series 100/200/300 aircraft (serials 003–599). It requires installing spoiler‑cable disconnect sensors, correcting cable interference where needed, and reworking the spoiler warning‑light circuit so failures are detected at all speeds. The work must follow Bombardier service instructions and be completed within 24 months of the AD’s effective date (3 August 2006)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-126-spoiler-cable-disconnect-sensing-system","history":"/api/acts/ad-dhc-8-126-spoiler-cable-disconnect-sensing-system/history","analysis":"/api/acts/ad-dhc-8-126-spoiler-cable-disconnect-sensing-system/analysis","conflicts":"/api/acts/ad-dhc-8-126-spoiler-cable-disconnect-sensing-system/conflicts","importantCases":"/api/acts/ad-dhc-8-126-spoiler-cable-disconnect-sensing-system/important-cases","documents":"/api/acts/ad-dhc-8-126-spoiler-cable-disconnect-sensing-system/documents"}}