A319 TAWS - Safety Alts??
Thread Starter
Joined: Mar 2000
Posts: 1,337
Likes: 1
From: Sunrise Senior Living
A319 TAWS - Safety Alts??
Brand new A319s - on selecting 'Terrain on ND', apart from the usual colours depicting the terrain, I espy a box in the bottom right of the ND with 2 numbers which I guess are to do with safe alts because they change with the scale.
Nothing in the FCOM. Can anyone from the 'big busses' help to unwind this conundrum please?
Many thanks,
mcdhu
Nothing in the FCOM. Can anyone from the 'big busses' help to unwind this conundrum please?
Many thanks,
mcdhu
Joined: Jul 2003
Posts: 1,323
Likes: 54
From: An Island Province
The display relates to the Peaks Mode – an excellent addition that all aircraft should obtain. See EGPWS Pilots Guide Mk5 & 7
“Peaks Display has all the characteristics of the Non-Peaks Display but with additional terrain display features for enhanced situational awareness independent of the aircraft’s altitude. The principle additions are:
• The digital display of the highest and lowest terrain/obstacle elevations currently displayed,
• The display of additional solid or lower density color bands, including the addition of the graphic representation of sea level (0 feet MSL).
With Terrain Display selected on, digital values representing the highest terrain/obstacle elevation and the elevation for the bottom of the lowest color band are displayed. These are based on the range selected (terrain in view)
The location of the digital values can vary somewhat for the display used, but for this guide will be shown in the lower right corner of the display. These elevations are expressed in hundreds of feet above sea level (e.g., 125 is 12,500 feet MSL) with the highest elevation on top and the lowest on the bottom.
However, in the event that there is no appreciable difference in the terrain/obstacle elevations (flat terrain), only the highest value is displayed. Additionally, the color of the elevation value is presented the same as the color of the terrain display containing that elevation (i.e., red if the terrain/obstacle with that elevation is depicted as red in the terrain plan view, yellow if yellow, etc.).
When the aircraft is 500 feet (250 with gear down) or less above the terrain in view (yellow or red is displayed), the Peaks color scheme is identical to the standard display, with the exception of the addition of sea level when supported by the display”.
“Peaks Display has all the characteristics of the Non-Peaks Display but with additional terrain display features for enhanced situational awareness independent of the aircraft’s altitude. The principle additions are:
• The digital display of the highest and lowest terrain/obstacle elevations currently displayed,
• The display of additional solid or lower density color bands, including the addition of the graphic representation of sea level (0 feet MSL).
With Terrain Display selected on, digital values representing the highest terrain/obstacle elevation and the elevation for the bottom of the lowest color band are displayed. These are based on the range selected (terrain in view)
The location of the digital values can vary somewhat for the display used, but for this guide will be shown in the lower right corner of the display. These elevations are expressed in hundreds of feet above sea level (e.g., 125 is 12,500 feet MSL) with the highest elevation on top and the lowest on the bottom.
However, in the event that there is no appreciable difference in the terrain/obstacle elevations (flat terrain), only the highest value is displayed. Additionally, the color of the elevation value is presented the same as the color of the terrain display containing that elevation (i.e., red if the terrain/obstacle with that elevation is depicted as red in the terrain plan view, yellow if yellow, etc.).
When the aircraft is 500 feet (250 with gear down) or less above the terrain in view (yellow or red is displayed), the Peaks color scheme is identical to the standard display, with the exception of the addition of sea level when supported by the display”.
Thread Starter
Joined: Mar 2000
Posts: 1,337
Likes: 1
From: Sunrise Senior Living
Alf,
Brilliant! Thanks - just what I was after. Had another look yesterday after reading yr post and it all makes sense. I'll have a look at the Pilot's Guide when I have a mo.
Cheers,
mcdhu
Brilliant! Thanks - just what I was after. Had another look yesterday after reading yr post and it all makes sense. I'll have a look at the Pilot's Guide when I have a mo.
Cheers,
mcdhu
