{"id":"F2006B10531","name":"AD/HS 125/89 Amdt 1 - Elevator Mass Balance Sideplate and Spigot Corrosion","slug":"ad-hs-125-89-amdt-1-elevator-mass-balance-sideplate-and-spigot-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116325,"registerId":"commonwealth-F2006B10531-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/89 Amdt 1 - Elevator Mass Balance Sideplate and Spigot Corrosion","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)  \nBritish Aerospace BAe 125 Series Aeroplanes\n\nAD/HS 125/89\n\nAmdt 1\n\n  \n\nElevator Mass Balance Sideplate and Spigot Corrosion\n\n  \n11/88\n\nApplicability: All models to 700 series.\n\nRequirement: Action in accordance with British Aerospace SB 27-142 Rev 2.\n\nCompliance: a. prior to 31 December 1987 for aircraft manufactured prior to 1985 and repeat at each C3 (24 months) inspection thereafter.\n\nb. at the next C2 inspection after 31 December 1987 for aircraft manufactured after 31 December 1984 and repeat at each C3 inspection thereafter.\n\nBackground: Corrosion has been reported on the sideplate and spigot. This could result in displacement of the sideplate, which if not corrected could result in control surface interference. Amdt 1 clarifies the inspection periodicity.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2616},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 1 only clarifies the inspection periodicity (how often the inspection must be repeated). It does not expand the applicability to new aircraft models or add new substantive requirements beyond the original directive."},"complexity_factors":["Technical aviation terminology requiring specialized knowledge (elevator mass balance, spigot, C2/C3 inspection intervals)","Conditional compliance dates based on aircraft manufacture date creating two distinct regulatory pathways","Reference to external technical document (British Aerospace Service Bulletin 27-142 Rev 2) without reproducing its content"],"plain_english_summary":"This directive requires owners/operators of British Aerospace 125 series (up to model 700) to inspect the elevator mass balance sideplate and spigot for corrosion per British Aerospace Service Bulletin 27-142 Revision 2. Corrosion can allow the sideplate to shift or detach and jam control surfaces, risking loss of control. Initial and 24‑month repeat inspection timing differs for aircraft built before 1985 versus after Dec 1984. Amendment 1 only clarifies inspection periodicity."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-89-amdt-1-elevator-mass-balance-sideplate-and-spigot-corrosion","history":"/api/acts/ad-hs-125-89-amdt-1-elevator-mass-balance-sideplate-and-spigot-corrosion/history","analysis":"/api/acts/ad-hs-125-89-amdt-1-elevator-mass-balance-sideplate-and-spigot-corrosion/analysis","conflicts":"/api/acts/ad-hs-125-89-amdt-1-elevator-mass-balance-sideplate-and-spigot-corrosion/conflicts","importantCases":"/api/acts/ad-hs-125-89-amdt-1-elevator-mass-balance-sideplate-and-spigot-corrosion/important-cases","documents":"/api/acts/ad-hs-125-89-amdt-1-elevator-mass-balance-sideplate-and-spigot-corrosion/documents"}}