RVSM? How many transponders?

[Tram]

OK guys-

I am studying for an interview and there is a question on the gouge about RVSM and how many transponders are needed..

Is it just 2? Or are the required 2 independent measurement systems 2 transponders and the ssr is a 3rd backup?

[FONT=Verdana, Arial, Helvetica, sans-serif]The following requirements have to be fulfilled to get an RVSM STC:[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]• Two independent altitude measurement systems meeting the system error requirements.[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]• One automatic control system keeping the aircraft altitude within ±20 m (±65 ft).[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]• One altitude alert system with limits ±90 m (±300 ft).[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]• One secondary surveillance radar (SSR) altitude reporting transponder.[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]• RVSM compliant avionics configuration.


[/FONT]

 

[Daytonaflyer]

In our Learjets we just have one which you can choose #1 or #2, so I guess that just means 2 total.

 

[Say Again Over]

• One secondary surveillance radar (SSR) altitude reporting transponder

You answered the question yourself, one operating transponder.

 

[Tram]

Ok, I wasn't sure if the secondary in SSR meant that you must have a secondary (meaning not the firstiary ) thus being 2..

 

[Say Again Over]

http://en.wikipedia.org/wiki/Secondary_surveillance_radar Here's the definition of SSR.