|
To view this page ensure that Adobe Flash Player version 9.0.124 or greater is installed. T-storms forecast? Yes No -Highest en route terrain =______ clearance Convective SIGMETS? Yes No Cloud bases = _______ Cloud tops = ________ Alternate required ? Yes No Over mountainous terrain ? Yes No Over large bodies of water ? Yes No Departure visibility = ________________ Lowest en route visibility = ___________ * VA decreases as weight decreases Destination visibility = _______________ Appendix 8 There are a number of ways to develop your skill in estimating your in-flight visibility and cloud clearance. These techniques will help you establish a continuous weather assessment habit. It will also help you calibrate your perceptions and learn when to trust what you see. . o A runway that is 5,300 feet long is about a mile. Look to see how far ahead you can see, and estimate the number of runways that it would take to cover that distance. o A 2,600 foot runway would be about a half mile, and so on. In this case, visibility is less than 3 miles if you cannot see 6 runway lengths ahead.
. o If, for example, your ground speed is 105 knots, that’s about 120 mph and you’ll cover about 2 miles per minute. If you reach the point in less than 90 seconds, the in-flight visibility is less than 3 miles! o A simple variation on this technique it to use GPS or DME while flying directly to or from a waypoint or VOR. Just look at the beginning and ending mileage on the GPS or DME to see how far you’ve flown to reach the farthest point you can see.
.
|
