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-   Tech Log (https://www.pprune.org/tech-log-15/)
-   -   Radio Altimeter (https://www.pprune.org/tech-log/240939-radio-altimeter.html)

Piltdown Man 30th August 2006 22:08
Cos that's when the RadAlt says it's above 1,000', TCAS will give RA's. The EGPWS is also rather interested in your absolute height, where ever you are.

But to change tack, if Alex says that the answer is x, then the answer is x. This man knows more than I ever will and knows the answers to the campaign's questions, so please ignore my previous post.

PM

Graybeard 1st December 2006 16:56
Originally Posted by chrisbl (Post 2801715)
Came across this question in ATPL studies:

The radio altimeter receives information from:

a) The gound within an ellipse of 30 degrees in the for and aft axis and 60 degrees in the athwartships axis beneath the aircraft

b) The ground within a 30 degree cone directly beneath the aircraft

c) The ground directly beneath the aircraft

d) The ground below the aircraft within a narrow cone angled 70 degrees down from the horizontal

The poor spelling and grammar are not mine, this is exactly how it was written

Which is the least wrong answer and why?
Just ran across this old one. The radio altimeter "sees" the ground in the cone described in a). It indicates the distance to the ground per c), in other words, the closest point. Which altitude is important to you?

GB


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