Alt Alert vs OWC

[Laud]

As seen in Wags vid about the GAU-8, you can alter the altitude warning via the UFC. But you can also edit the OWC (obstacle warning cue) on the CDU->SYS->LASTE->DTSAS. Can somebody explain me the differences of these both systems or what they do different from each other?!?

[BlueRidgeDx]

The Altitude Alert that is set through the UFC is the standard function that provides the "ALTITUDE ALTITUDE" aural warning when penetrating the selected minimum/maximum altitude. It can be based on radar or barometric altitude, as appropriate.

 

The Obstacle Warning Cue (OWC) allows the preselection of a clearance height above known obstacles in the DTSAS database. If an obstacle penetrates the set clearance plane and is within 4km of the aircraft, the OWC will display the OBSTACLE mnemonic on the HUD with a flashing caret to indicate the relative direction of the obstacle. The VMU will also generate an "OBSTACLE" aural alert.

 

In addition, there is the TGP Attitude Advisory Function (TAAF) which will alert you if the aircraft exceeds certain pitch/roll limits and is below a preselected altitude, and serves as a warning of unusual attitudes while the pilot is head-down manipulating the TGP. The TAAF will generate a CHECK ATTITUDE warning on both MFCDs.

Edited April 20, 2011 by BlueRidgeDx

[Laud]

TY mate! Great explanation!

 

Well deserved to join the Testers-Team!

[VTJS17_Fire]

But the TAAF isn't functional, right?

 

 

kind regards,

Fire

[BlueRidgeDx]

But the TAAF isn't functional, right?

 

It works for me.

 

Remember, the TAAF doesn't simply produce an alert just because you're below the selected altitude. It only warns of an unusual attitude, and only if the TGP is on at least one MFCD.

 

Try this:

 

Set the TAAF in the TGP CTL page to some altitude. Ensure you're below the selected altitude, and note that there is no warning generated.

 

Now, roll the aircraft to at least 75 degrees of bank with the nose below the horizon and note the CHECK ATTITUDE message on both MFCD's, and the flashing WARNING on the HUD.

 

The same thing will happen regardless of bank angle if pitch attitude is greater than 20 degrees nose low.

Edited April 20, 2011 by BlueRidgeDx
spellin'

[Frederf]

Wow 75 degrees of bank is definitely the result of not minding the store while staring at the TGP page. Maybe it was playing a really good movie? Ah, 20 degrees low, any bank is more reasonable.

 

Since you answered the first question so well I can only ask another. Does the DCS DTSAS database have any obstacles programmed into it at all? I've never had the OWC warning go off.

[EtherealN]

Wow 75 degrees of bank is definitely the result of not minding the store while staring at the TGP page. Maybe it was playing a really good movie? Ah, 20 degrees low, any bank is more reasonable.

 

If I remember the IMC stuff right (I don't have the books available right now to double-check), you only need ~30 seconds to enter 75 degrees of bank while maintaining a slow enough attitude change that you won't feel it - assuming of course adequate stick pressure to keep your G aimed at the seat instead of to the side. Very common cause of fatal accidents.

[BlueRidgeDx]

Does the DCS DTSAS database have any obstacles programmed into it at all? I've never had the OWC warning go off.

 

I don't know off hand, but I've never seen it in-game either.

 

I'm just guessing, but I suspect that the logic is there, but the obstacle data is not present for the Georgia/Russia map.

[VTJS17_Fire]

Oh, thanks. I'll test it the next days.

 

 

kind regards,

Fire