So, youve decided the risk is worth it and youre going to execute a zero-zero or low-visibility takeoff. Youve thoroughly prepped the airplane, the cockpit and yourself for the operation, youve practiced it, you have a solid-gold takeoff alternate only a few miles away, with an ILS above minimums, and youre ready. One problem: The weather is so bad, you cant see more than one or two of the runway stripes at a time. Is that enough to help ensure directional control on the takeoff roll? Probably not.
Maintaining directional control during zero-zero or low-visibility takeoffs is challenging due to the lack of visual cues from the runway.
Vertical card compasses and similar devices are unsuitable for this purpose due to inherent acceleration errors.
Directional gyros (DGs) and horizontal situation indicators (HSIs) are the preferred instruments for directional control in low-visibility conditions.
It is critical to ensure DGs or HSIs are properly spun up, accurately aligned to the runway heading, and closely monitored throughout the takeoff roll for safe operation.
So, youve decided the risk is worth it and youre going to execute a zero-zero or low-visibility takeoff. Youve thoroughly prepped the airplane, the cockpit and yourself for the operation, youve practiced it, you have a solid-gold takeoff alternate only a few miles away, with an ILS above minimums, and youre ready.
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