{"id":"F2008L00145","name":"AD/PR/38 - Propeller Electronic Controller","slug":"ad-pr-38-propeller-electronic-controller","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":72287,"registerId":"commonwealth-F2008L00145-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Propellers - Variable Pitch - Dowty Roto","sectionType":"division","heading":"Propellers - Variable Pitch - Dowty Rotol","content":"### Propellers - Variable Pitch - Dowty Rotol\n\n| AD/PR/38 | Propeller Electronic Controller | 3/2008 TX |\n| -------- | ------------------------------- | --------- |\n\n| Applicability: | Propeller Electronic Controller Part No. 699018002 with the following serial numbers:- 1488,1489, 1490, 1494, 1495, 1496, 1498, 1499, 1500, 1501, 1502, 1503, 1504, 1505, 1506, 1508, 1509, 1510, 1511, 1512, 1513, 1514, 1515, 1516, 1517, 1518, 1519, 1520, 1521, 1522, 1527, 1528, 1529, 1530, 1531, 1532, 1537, 1538, 1541, 1542, 1543, 1544, 1549, 1550, 1567, 1569, 1570, 1571, 1572, 1573, 1574 and 1581                                                                                                                                                                                                                                          |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. If two affected units, listed in the applicability, are installed on one aircraft, remove one unit from service.2. Remove all units identified above from service.3. Replace with a serviceable unit, Part no 699018002, in accordance with the relevant Aircraft Maintenance Manual.4. Once removed, do not refit affected units until the input/output circuit board has been replaced by an organisation approved for the task, in accordance with Alert Service Bulletin D8400-61-A77 dated 14 January 2008.Note 1: These units are known to be fitted to, but not limited to, Bombardier DHC 8-400 aircraft.Note 2: UK CAA AD G-2008-003 refers. |\n| Compliance     | For Requirement 1. Within 7 days of the effective date of this AD.For Requirement 2. Within 1200 flight hours or 6 months of the effective date of this AD, whichever limit is reached first.For Requirement 3 From the effective date of this Directive.For Requirement 4 From the effective date of this Directive.                                                                                                                                                                                                                                                                                                                                    |\n|                | This Airworthiness Directive becomes effective on 21 January 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n\n| Background: | The TC holder has identified that, due to a production problem, there is an increased potential for failure of input/output circuit boards fitted to Propeller Electronic Controllers with the above unit serial numbers. Failure could lead to uncommanded propeller speed changes or loss of the autofeather function. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n18 January 2008","sortOrder":0},{"sectionNumber":"AD/PR/38","sectionType":"part","heading":"AD/PR/38","content":"## AD/PR/38","sortOrder":1},{"sectionNumber":"Propeller Electronic Controller","sectionType":"part","heading":"Propeller Electronic Controller","content":"## Propeller Electronic Controller","sortOrder":2},{"sectionNumber":"3/2008 TX","sectionType":"part","heading":"3/2008 TX","content":"## 3/2008 TX","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive is narrowly targeted to the listed serial-numbered electronic controllers and requires removal, replacement, and a repaired-board-before-refit process. It implements remedial measures for a production defect and does not broaden applicability or add unrelated obligations beyond those specified."},"complexity_factors":["Narrow applicability limited to a long list of specific serial numbers—requires record checks and asset tracking.","Multiple, different compliance deadlines (7 days for one action; 1200 flight hours or 6 months for another; immediate effect for replacement/prohibition), increasing scheduling complexity.","Requirement to follow the Aircraft Maintenance Manual for replacement creates reliance on operator procedures and parts availability.","Prohibition on refitting until the input/output circuit board is replaced by an organisation approved for the task—creates dependency on authorised maintenance providers and the Alert Service Bulletin.","Cross-reference to an external Alert Service Bulletin (D8400-61-A77) and to a UK CAA AD requires coordination with other regulatory and technical material.","Potential operational impact where two affected units are installed on one aircraft (must remove one unit) introduces short-term availability or dispatch constraints."],"plain_english_summary":"This Airworthiness Directive requires operators to remove specified Propeller Electronic Controller units (Part No. 699018002, listed serial numbers) from service, replace them with serviceable units, and prohibit refitting until the unit’s input/output circuit board is replaced by an organisation approved to do so under Alert Service Bulletin D8400-61-A77. It affects aircraft fitted with those serial-numbered controllers (for example some Bombardier DHC‑8‑400s). The action responds to a production defect that could cause uncommanded propeller speed changes or loss of autofeather."},"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 standard, targeted Airworthiness Directive addressing a specific manufacturing defect in a specific component. The scope remains precisely limited to the identified serial numbers and the required remedial actions. There is no evidence of scope creep beyond the original safety purpose."},"complexity_factors":["Very short document (approximately 300 words)","Only 4 numbered requirements with clear, sequential logic","Single defined applicability criterion (specific part number and 52 serial numbers)","No cross-references to other legislation or complex conditional triggers","Simple compliance timeline (7 days, 6 months/1200 hours, or immediate)","Plain language background explanation included","No nested exceptions or sub-delegations"],"plain_english_summary":"This AD requires operators to remove and replace specific Dowty Rotol Propeller Electronic Controllers (serial nos. 1488–1581) found on Q400s because a manufacturing defect in circuit boards can cause uncommanded propeller speed changes or loss of automatic feathering. \n\nIf an aircraft has two affected units, one must be removed within seven days; all affected units must be removed within six months or 1,200 flight hours and may only be returned after approved circuit-board replacement per the manufacturer’s service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pr-38-propeller-electronic-controller","history":"/api/acts/ad-pr-38-propeller-electronic-controller/history","analysis":"/api/acts/ad-pr-38-propeller-electronic-controller/analysis","conflicts":"/api/acts/ad-pr-38-propeller-electronic-controller/conflicts","importantCases":"/api/acts/ad-pr-38-propeller-electronic-controller/important-cases","documents":"/api/acts/ad-pr-38-propeller-electronic-controller/documents"}}