{"id":"F2005L03927","name":"AD/DO 328/32 - Honeywell GP-300 Guidance and Display Controller","slug":"ad-do-328-32-honeywell-gp-300-guidance-and-display-controller","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39751,"registerId":"commonwealth-F2005L03927-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 328/32 | Honeywell GP-300 Guidanceand Display Controller | 1/2006 |\n| ------------ | ----------------------------------------------- | ------ |\n\n| Applicability: | 328-100 aeroplanes equipped with Honeywell GP-300 Guidance and Display Controller part number (P/N) 7105327-901.                                                                                                                                                                 |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | If not previously accomplished, either modify or replace the Guidance and Display Controller P/N 7105327-901 in accordance with Fairchild Dornier Service Bulletin SB-328-22-219 dated 20 May 1997.                                                                              |\n|                | Note: LBA AD 96-239/2 refers.                                                                                                                                                                                                                                                    |\n| Compliance:    | Within 30 day after the effective date of this Directive.                                                                                                                                                                                                                        |\n|                | This Airworthiness Directive becomes effective on 19 January 2006.                                                                                                                                                                                                               |\n| Background:    | The Luftfahrt-Bundesamt has received advice from both Dornier and Honeywell that Modification A to the Guidance and Display Controller may not have been correctly installed on some units which could prevent the unit’s ‘overheat protection device’ from operating correctly. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n30 November 2005","sortOrder":0},{"sectionNumber":"AD/DO 328/32","sectionType":"part","heading":"AD/DO 328/32","content":"## AD/DO 328/32","sortOrder":1},{"sectionNumber":"Honeywell GP-300 Guidanceand Display Con","sectionType":"part","heading":"Honeywell GP-300 Guidanceand Display Controller","content":"## Honeywell GP-300 Guidance  \nand Display Controller","sortOrder":2},{"sectionNumber":"1/2006","sectionType":"part","heading":"1/2006","content":"## 1/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive enforces correction for the same installed units identified by the manufacturer and the LBA, requiring modification or replacement per the service bulletin to restore overheat protection. It implements a remedial action rather than expanding the set of affected aircraft or introducing new obligations beyond the specified retrofit."},"complexity_factors":["Narrow technical applicability: specific aircraft model and exact part number (Applicability)","Single prescribed remedy (modify or replace) tied to an external service bulletin (Requirement)","Short compliance window: 30 days from effective date increases operational scheduling pressure (Compliance)","Safety-critical root cause (possible failure of overheat protection) escalates priority and verification requirements (Background)","Dependence on manufacturer's service instructions for correct implementation (Requirement)","Cross-reference to foreign authority AD (LBA AD 96-239/2) may require coordination with overseas records"],"plain_english_summary":"Requires owners/operators of Dornier 328‑100 aeroplanes fitted with Honeywell GP‑300 Guidance and Display Controller P/N 7105327‑901 to modify or replace that unit in accordance with Fairchild Dornier Service Bulletin SB‑328‑22‑219. (Applicability; Requirement)\n\nOperators must complete the work within 30 days of the AD’s effective date; CASA issued the directive after Dornier and Honeywell advised that Modification A may not have been correctly installed, potentially disabling the unit’s overheat protection device. (Compliance; Background)"},"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":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific technical defect in a specific aircraft component. The scope remains precisely limited to the identified overheat protection issue in the Honeywell GP-300 unit. No scope creep is evident."},"complexity_factors":["Very short document (under 300 words)","Only one defined term (P/N = part number)","Single, unambiguous requirement with clear alternative actions (modify OR replace)","Simple compliance deadline (30 days from effective date)","No nested exceptions or conditional logic","Single cross-reference to German authority document (LBA AD 96-239/2) provided as background only","Clear applicability criteria (specific aircraft model + specific part number)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's aviation regulator (CASA). It requires owners or operators of specific Dornier 328-100 aircraft to fix a potentially dangerous defect in a piece of cockpit equipment called the **Honeywell GP-300 Guidance and Display Controller**.\n\n**What the problem is:**\nThe German aviation authority discovered that a safety modification (called \"Modification A\") may have been installed incorrectly on some units. This could stop the unit's **overheat protection device** from working — meaning the equipment could overheat and fail during flight.\n\n**Who must act:**\nAnyone operating a Dornier 328-100 aircraft that has the specific Honeywell part number **7105327-901** installed.\n\n**What they must do:**\nWithin **30 days** of 19 January 2006, they must either:\n- Modify the existing unit, OR\n- Replace it entirely\n\nThis work must follow the instructions in **Fairchild Dornier Service Bulletin SB-328-22-219** (dated 20 May 1997).\n\n**Why it matters:**\nIf the overheat protection fails, the guidance and display controller could malfunction or fail completely. This is critical flight safety equipment — its failure could affect navigation and flight control displays, potentially endangering the aircraft and passengers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-328-32-honeywell-gp-300-guidance-and-display-controller","history":"/api/acts/ad-do-328-32-honeywell-gp-300-guidance-and-display-controller/history","analysis":"/api/acts/ad-do-328-32-honeywell-gp-300-guidance-and-display-controller/analysis","conflicts":"/api/acts/ad-do-328-32-honeywell-gp-300-guidance-and-display-controller/conflicts","importantCases":"/api/acts/ad-do-328-32-honeywell-gp-300-guidance-and-display-controller/important-cases","documents":"/api/acts/ad-do-328-32-honeywell-gp-300-guidance-and-display-controller/documents"}}