The North Vietnamese advance had been timed to coincide with the seasonal monsoon, whose cloud ceilings negated many U . S . airstrikes.
22.
The cloud ceiling was at only 1, 600 feet, lower than the crash site, and rain and wind were forecast for the afternoon.
23.
Though most flight operations went according to plan, naval aviators frequently operated in low visibility conditions with thick cloud ceilings over the Gulf.
24.
Glide mode is used when the cloud ceiling and / or the visibility is too low to permit the use of the ballistic mode.
25.
_Weather at the time of the crash was good, with a broken cloud ceiling at 13, 000 feet and an overcast ceiling at 24, 000 feet.
26.
The main difference to the regular German class D airspace is, that within a CTR there is a minimum required cloud ceiling of 1500 ft AGL.
27.
In response they were advised that they were from the airport and that the weather was now visibility x cloud ceiling, and were cleared for landing.
28.
The American Eagle flight that crashed Tuesday night near Raleigh-Durham approached the airport in drizzle, a low cloud ceiling, and visibility of two to three miles.
29.
But it depends on the thickness of the clouds and the cloud ceiling, because the commander has to be able to see the runway before making final approach.
30.
Called the Precision Approach Radar and the Mobile Microwave Landing System, they are designed to allow military airplanes to land in soupy weather with cloud ceilings down to 200 feet.
