The EEC redline overspeed protection for N1 and N2 is provided in which modes?

The EEC redline overspeed protection for N1 and N2 is provided in which modes?

• A. Yes, for both N1 and N2 in normal and alternate modes
• B. Yes, but only for N1
• C. Yes, but only for N2
• D. No

Answer: (A)

Redline overspeed protection is designed to guard both compressor spools, N1 and N2, from exceeding their maximum safe speeds. The Electronic Engine Control continuously monitors both speeds and will take protective action if either approaches its limit, such as reducing fuel flow, to keep the engine within safe operating bounds. This protection must be active in both normal and alternate modes, because emergencies or faults can occur in either mode, and you want to ensure that no matter how the engine is being controlled, overspeed of either spool is prevented. That’s why the best answer is that protection is provided for both N1 and N2 in normal and alternate modes.

Redline overspeed protection is designed to guard both compressor spools, N1 and N2, from exceeding their maximum safe speeds. The Electronic Engine Control continuously monitors both speeds and will take protective action if either approaches its limit, such as reducing fuel flow, to keep the engine within safe operating bounds. This protection must be active in both normal and alternate modes, because emergencies or faults can occur in either mode, and you want to ensure that no matter how the engine is being controlled, overspeed of either spool is prevented. That’s why the best answer is that protection is provided for both N1 and N2 in normal and alternate modes.