PPRuNe Forums - air data system

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dreamagicz

25th Sep 2009 11:02

air data system

Hey guys can anyone help me find in-depth details about air data instrumentation system as well as of the evolution of modern cockpit?? Many thanks in advance...

IFixPlanes

25th Sep 2009 14:35

Here is the :
Phrases from The Hitchhiker's Guide to the Galaxy - Wikipedia, the free encyclopedia

Flight777

27th Sep 2009 09:27

For my college I hat to aquire a book about air data instruments which is very detailed and may be very usefull for you. Here is the link:

Aircraft Instruments and Integrated Systems: Amazon.co.uk: E.H.J. Pallett: Books

(NO SPAM, just referring to the book)

Hand Shandy

27th Sep 2009 14:06

That was far more interesting than E and I bars.

411A	28th Sep 2009 05:46

The first air data system widely used on jet transport aircraft was KIFIS.
I provided this explanation on another forum due to a similar question...

Quote:

Kollsman Integrated Flight Instrument System.
KIFIS was a totally pneumatically powered analogue instrument system, using gears, cogs etc...the only electrical power was to provide failure function indications and cross-reference data.
An entirely adequate system for early jet transports.
And, utterly reliable.

However, because of the KIFIS system, autopilots of the day were, well....just OK, nothing to write home about.
For example, the Collins AP105 autopilot system used on many early B707's was quite accurate in the heading/altitude-hold modes, ILS/VOR modes, less so.
In the latter case, intercept angles needed to be kept within 30 degrees (maximum) as otherwise on-course information/guideance would be highly suspect.

This will provide a general simplified view.

syseng68k

2nd Oct 2009 22:17

Non linear cams

Ah - Smiths servo altimeters ?...

Blacksheep

2nd Oct 2009 23:32

It all began with the swing-arm airspeed indicator. A vane was suspended from the lower surface of the upper plane, with a calibrated scale on a flat panel immediately outboard of the vane arm. As airspeed increased, the angular displacement of the vane arm increased and the speed could be read off against the calibrated scale. Once pilots could tell how fast they were going (or not going, as the case may be) they wanted to know more, like how high they were, how much fuel was in the tank, what time was it and such like. Eventually we ended up with the modern cockpit, where a pilot has so much information available to him that he no longer has any idea what is going on, and leaves it all to the computers.

Quote:

Non linear cams

Don't complicate matters until you've explained the different methods used by Smith's and Kelvin and Hughes for temperature compensation of the capsule stack in their altimeters.

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