At what Ng should the starter caution disappear?

At what Ng should the starter caution disappear?

• A. 30-40% NG
• B. 70-85% NG
• C. 52-65% NG
• D. 85-95% NG

Answer: (C)

During a start, the starter spins the gas generator to bring Ng up to a speed where ignition and stable operation can be maintained. The starter caution disappears once Ng reaches a sufficient speed, roughly in the 52–65 percent range. At about mid-to-high fifty percent Ng, the compressor and ignition system have enough rotational energy to light off and sustain the engine without the starter, so the starter is disengaged and the caution clears. This range accounts for normal tolerances in temperature, bleed conditions, and engine load, reflecting that starts aren’t identical every time. If Ng fails to reach this range promptly, the start may be aborted or a fault investigated.

During a start, the starter spins the gas generator to bring Ng up to a speed where ignition and stable operation can be maintained. The starter caution disappears once Ng reaches a sufficient speed, roughly in the 52–65 percent range. At about mid-to-high fifty percent Ng, the compressor and ignition system have enough rotational energy to light off and sustain the engine without the starter, so the starter is disengaged and the caution clears. This range accounts for normal tolerances in temperature, bleed conditions, and engine load, reflecting that starts aren’t identical every time. If Ng fails to reach this range promptly, the start may be aborted or a fault investigated.