Rolls-Royce Deutschland (RRD) - Reverse Wired Independent Overspeed Protection Coils in BR700 series engines
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators and maintenance personnel should perform polarity tests on the Combined Overspeed Shutoff Solenoid valve IOP coils to confirm correct wiring as recommended by Rolls-Royce Deutschland. Copies of the referenced ALERT Service Bulletins SB-BR700-73-A900451 and SB-BR700-73-A900452 can be obtained from Rolls-Royce Deutschland or downloaded online for detailed instructions. No specific compliance deadline is stated, but timely action is advised to mitigate the safety risk.
Summary
EASA Safety Information Notice No. 2007-45 is an informational document addressing reverse wired Independent Overspeed Protection (IOP) coils in Rolls-Royce Deutschland BR700 series engines. The affected engine models include BR700-710A1-10, BR700-710A2-20, BR700-710C4-11, BR700-715A1-30, BR700-715B1-30, and BR700-715C1-30, which are installed on aircraft such as Bombardier BD-700-1A10 and BD-700-1A11, Gulfstream Aerospace GV and GV-SP, and McDonnell Douglas 717-200 series. The notice highlights a wiring issue that could disable the Fuel Metering Unit shutoff during an overspeed event.
What changed
This Safety Information Notice introduces awareness of a manufacturing defect involving reverse wired IOP coils in certain BR700 engines, which compromises the overspeed shutoff function. It does not impose new regulatory requirements but recommends performing polarity tests to verify correct wiring of the Combined Overspeed Shutoff Solenoid valve IOP coils. The document clarifies that EASA will not issue an Airworthiness Directive as the issue is not related to design approval but leaves corrective action to national authorities.
Why it matters
The wiring defect can lead to failure of the Fuel Metering Unit shutoff during an engine overspeed event, posing a potential safety risk. Aviation professionals, including operators and maintenance organizations, need to be aware of this issue to ensure proper testing and corrective measures are taken. Understanding this notice helps maintain engine safety and compliance with manufacturer recommendations, reducing the risk of in-flight engine overspeed incidents.
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