F-16.net

Newbie Joined: Aug 23, 2008 Posts: 6 Status: Offline

I would like to know the operation of some F-16 instruments. Here they are:

1. the HSI - the normal HSIs use something as a "slaved gyro" I think, right? But the F-16s HSI needs the INS for the HSI to work, so does the F-16 HSI have it's own gyro or it uses the gyros from the INS or what else? And does it need power?

2. VVI - normal VSIs measure the rate of change of altitude by detecting the change in air pressure (static pressure) as altitude changes and they don't need power for it. But the F-16s VVI needs power, and not only the battery power but the engine power or EPU power, so why does it need power and how does it work?

3. AOA indicator also needs power but I think I saw in some aircraft, like in a Learjet 45 AOA indicators without the need for power?

4. the altimeter, when the engine is shut down something appears above the 1000 feet numbers, I thinks it says PNEU or something, so does it work different with engine and without the engine?

5. the ADI, when battery power is on, the GS and LOC signs are gone but the OFF and AUX signs are still there. They vanish when INS aligns a bit, the OFF sign vanishes before the AUX sign, the AUX vanishes at something like 1 minute of INS aligning, so what does it mean AUX in the yellow box?

The ADI also needs INS to work, so does it have it's own gyro like in other aircraft, or it uses only INS?

6. The backup attitude direction indicator also has something over it before power is applyed but I think he doesn't use INS, so what about him? Own gyro or something else and does it need power?

7. On the MAGV page on the DED there can be entered informations about magnetic variation in the area, so for what it's used? Both HSI and the HUD heading tape show the magnetic heading and not the true heading, right? Is the MAGV information used just for INS positioning purposes to calculate true heading because it works with the GPS and displays GPS coordinates which need true heading?

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Newbie Joined: Aug 23, 2008 Posts: 6 Status: Offline

So, any real pilots familiar with these instruments? Any instruments? Anybody? Smile

Sorry, but I can't find any information about these F-16 instruments on the net, only about normal instruments but the F-16 has different instruments than normal aircraft and I'm very interested in it.

VVI the short answer; input pressures pass through the CADC and the CADC does not run in battery power. You need either external power applied or internal power.

Altimeter has 2 modes, electric and pneumatic (baro) modes. When you lose electrical power or your CADC your altimeter automatically switches to baro.

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F-16 instruments