{"id":"F2005L03941","name":"AD/DO 328/21 - Ground Spoiler Actuator","slug":"ad-do-328-21-ground-spoiler-actuator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39787,"registerId":"commonwealth-F2005L03941-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Dornier 328 Series Aeroplanes","sectionType":"division","heading":"Dornier 328 Series Aeroplanes","content":"### Dornier 328 Series Aeroplanes\n\n| AD/DO 328/21 | Ground Spoiler Actuator | 1/2006 |\n| ------------ | ----------------------- | ------ |\n\n| Applicability: | Dornier 328-100 aeroplanes equipped with ground spoiler actuator P/N1059A0000-02.Amendment A actuators are not affected by this AD.                                                                                                                |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Unless previously accomplished, replace the four gland attachment screws P/N NAS6704HU3 in accordance with Dornier Service Bulletin No. SB-328-27-289 dated 3 March 1999 or later LBA approved revisions.Note: LBA AD 1999-175 refers.             |\n| Compliance:    | Prior to the actuator reaching 3300 flight hours. For actuators that have exceeded 3300 at the effective date of this AD, within the next 330 flight hours.                                                                                        |\n|                | This Airworthiness Directive becomes effective on 19 January 2006.                                                                                                                                                                                 |\n| Background:    | Gland attachment screws have been found loose or broken which could, in the worst case, lead to loss of hydraulics, disablement of the flaps and ground spoilers. This would lead to extension of the landing gear by use of the emergency system. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n29 November 2005","sortOrder":0},{"sectionNumber":"AD/DO 328/21","sectionType":"part","heading":"AD/DO 328/21","content":"## AD/DO 328/21","sortOrder":1},{"sectionNumber":"Ground Spoiler Actuator","sectionType":"part","heading":"Ground Spoiler Actuator","content":"## Ground Spoiler Actuator","sortOrder":2},{"sectionNumber":"1/2006","sectionType":"part","heading":"1/2006","content":"## 1/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific mechanical defect in a specific aircraft component. The scope remains precisely limited to the gland attachment screw replacement in Dornier 328-100 actuators, with no evidence of scope creep or expansion beyond the original safety issue identified."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined technical terms (part numbers P/N NAS6704HU3 and P/N 1059A0000-02)","Single, clear compliance requirement with straightforward time-based trigger","No cross-references to other legislation beyond a single reference to a Service Bulletin and a related German aviation authority directive (LBA AD 1999-175)","Simple binary applicability test (specific part number installed vs. Amendment A exemption)","No nested conditions or exceptions beyond the Amendment A carve-out"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft. It applies to specific **Dornier 328-100 aeroplanes** (a type of regional turboprop aircraft) that have a particular ground spoiler actuator installed.\n\n**What it does:**\n- **Requires replacement** of four specific screws (called \"gland attachment screws\") in the ground spoiler actuator system\n- These screws must be replaced with new ones before the actuator reaches 3,300 flight hours\n- If the actuator has already passed 3,300 hours when this directive takes effect, the replacement must happen within the next 330 flight hours\n\n**Why it matters:**\nLoose or broken screws in this system could cause:\n- Loss of hydraulic pressure\n- Failure of flaps and ground spoilers (critical for slowing down after landing)\n- Potential need to use emergency systems to extend the landing gear\n\n**Who it affects:**\n- Owners and operators of Dornier 328-100 aircraft with actuator part number 1059A0000-02\n- Amendment A actuators are **exempt** (not affected)\n\n**The bottom line:** This is a preventive safety measure to avoid potentially dangerous in-flight or landing situations caused by mechanical failure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains targeted to addressing loose or broken gland attachment screws on ground spoiler actuators P/N 1059A0000-02 fitted to Dornier 328-100 aeroplanes, excluding Amendment A actuators. The directive prescribes screw replacement per the referenced Dornier service bulletin and sets fixed flight-hour compliance windows; it does not broaden applicability beyond that defect remediation."},"complexity_factors":["Narrow, equipment-specific applicability (Dornier 328-100 with actuator P/N 1059A0000-02) reduces breadth but requires precise fleet identification.","Part-level specificity (four gland attachment screws, P/N NAS6704HU3) creates procurement and maintenance accuracy demands.","Exclusion for actuators with Amendment A introduces an eligibility check during maintenance records review.","Compliance tied to flight-hour thresholds (3300 hours, or 330 hours grace if exceeded) requires accurate hour-tracking and scheduling.","Action mandated by reference to an external document (Dornier SB-328-27-289) and ‘later LBA-approved revisions’ introduces dependency on up-to-date service bulletin versions.","Cross-reference to earlier LBA AD 1999-175 may require review of prior compliance history and records.","Potential operational impact if many actuators approach thresholds simultaneously (maintenance capacity and parts availability risk)."],"plain_english_summary":"This Airworthiness Directive requires operators of Dornier 328-100 aeroplanes fitted with ground spoiler actuator P/N 1059A0000-02 to replace the four gland attachment screws in accordance with Dornier Service Bulletin SB-328-27-289 (or later LBA-approved revision). Actuators modified to Amendment A are not affected. Compliance is required before the actuator reaches 3,300 flight hours, or within 330 flight hours if that threshold has already been exceeded. The stated aim is to prevent loose or broken screws that could cause hydraulic loss and disable flaps and ground spoilers."},"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-do-328-21-ground-spoiler-actuator","history":"/api/acts/ad-do-328-21-ground-spoiler-actuator/history","analysis":"/api/acts/ad-do-328-21-ground-spoiler-actuator/analysis","conflicts":"/api/acts/ad-do-328-21-ground-spoiler-actuator/conflicts","importantCases":"/api/acts/ad-do-328-21-ground-spoiler-actuator/important-cases","documents":"/api/acts/ad-do-328-21-ground-spoiler-actuator/documents"}}