Inmediatly after Lift Off, i recieve a Terrain Caution and Terrain Warning With Pull up, after departing From SPJC RWY15 which there are no obstacles. while maintaining a postive rate

---

Francesco Giacchetti wrote on Jun 8^th, 2020 at 3:04pm:

Inmediatly after Lift Off, i recieve a Terrain Caution and Terrain Warning With Pull up, after departing From SPJC RWY15 which there are no obstacles. while maintaining a postive rate

Same here on a LOT of other airports, for example EDDF.

How was this an OFFTOPIC reply in the bug tracking?

A freakin terrain warning after a normal takeoff is anything but not a bug!

I had terrain warning activation even when I was pushing back at some airport with mountainous nearby in 757 >:(

After liftoff on most airports I get a TERRAIN warning.
Happens at EDDF, EHAM, CYUL, KLAS.

Scholli04 wrote on Jun 10^th, 2020 at 11:44am:

How was this an OFFTOPIC reply in the bug tracking?

Because the terr warning from now on has this dedicated thread.
That doesn't necessarily mean there's no bug.
But there's at least one more party involved in the issue - the default scenery mesh. We are not sure if the mesh is perfect, so the mesh can be a reason for the false terr warnings.

Anyways, everyone is welcome to attach the flights saved right on the false terr warnings.   

Approaching airports with terrain around I usually get terrain cautions and warnings while operating well within the approach area.

Real aircraft have a protection zone around the approach where the warning is supressed (no, that's not in any FCOM so don't ask for an AIIR here, just ask yourself why on no video of an approach to Madeira, etc. you will not hear any terrain warnings while yours goes crazy).

This is especially important on airports with circling approaches, etc. where yours will always go crazy with its terrain, pull up and what not warnings.
Examples would be, amongst others, LPMA, GCLA, LDDU, LDSP, LGSM, LGKO, LTBS and anything mountanious.

Bug exists on both, 757 and 767.

Scholli04 wrote on Jun 12^th, 2020 at 6:32am:

Approaching airports with terrain around I usually get terrain cautions and warnings while operating well within the approach area. Real aircraft have a protection zone around the approach where the warning is supressed (no, that's not in any FCOM so don't ask for an AIIR here, just ask yourself why on no video of an approach to Madeira, etc. you will not hear any terrain warnings while yours goes crazy). This is especially important on airports with circling approaches, etc. where yours will always go crazy with its terrain, pull up and what not warnings. Examples would be, amongst others, LPMA, GCLA, LDDU, LDSP, LGSM, LGKO, LTBS and anything mountanious. Bug exists on both, 757 and 767.

Never say it's not in any FCOM, haha. In aviation, everything is written SOMEWHERE.

Major 757/767 operator:
https://i.imgur.com/UCB2l8G.jpg
"The GPWS does not provide an alert for flight toward vertically sheer
terrain or slow descents into terrain while in the landing configuration."


"When the aircraft is lower than 2000 feet above the terrain, terrain within 2000
feet of aircraft barometric altitude is displayed on the HSI/ND. Non-threat terrain
is depicted as several densities of dot patterns in green, amber, or red depending
on relative vertical distance between the aircraft and the terrain.

Note: (752PW) (763) The EGPWS terrain database, look-ahead terrain alerting,
and terrain display account for man-made obstructions.
When the aircraft is higher than 2000 feet above the terrain or within 400 feet of
the nearest airport runway elevation, terrain is not displayed.
Note: The GPWS look-ahead display is not designed to be used as an
independent navigation aid."

"The displays remain in view until the threat no longer exists or the TERR switch
is manually deselected."

Alex T wrote on Jun 12^th, 2020 at 1:54pm:

In aviation, everything is written SOMEWHERE.

Absolutely.
What exactly works not as per FCOM pls?

Captain Sim wrote on Jun 12^th, 2020 at 2:20pm:

Alex T wrote on Jun 12th, 2020 at 1:54pm: In aviation, everything is written SOMEWHERE. Absolutely. What exactly works not as per FCOM pls?

I have no idea! Not imputting anything here except the few lines about how it works for the users to see.

Or perhaps this line?

When the aircraft is higher than 2000 feet above the terrain or within 400 feet of
the nearest airport runway elevation, terrain is not displayed.

If they're saying it comes on right after takeoff with no obstacles around, it seems like it's broken then.

Captain Sim wrote on Jun 12^th, 2020 at 2:20pm:

Alex T wrote on Jun 12th, 2020 at 1:54pm: In aviation, everything is written SOMEWHERE. Absolutely. What exactly works not as per FCOM pls?

That is absolutely untrue. The page posted is the best proof. It only explains the genral way the terrain awareness system works.
It's a nice proof though that you did not even understand, nor read, what I posted.

Once again: There is special protection around the approach area, so that for example on the circling at LOWI, the circling at LPMA, LDDU, GCLA (the list is long) there are no useless warnings triggered.

Have a look at ANY video of any of these approaches and tell me why there's never a terrain warning heared. Accoring to your manual it must be there.

And now tell me why, because according to your manuals the GPWS should go crazy while it doens't.

I, once again, tell you why: Because NOT ALL FEATURES ARE DOCUMENTED IN FCOMs. They might be documented in Boeing documents which are NOT PUBLIC.
To help your general understanding of flight manuals: FCOMs only contain that information which the manufacturer thinks a pilot must know.
See the 737MAX and MCAS for the best example. They did not believe the pilots must know, so it wasn't included.

An FCOM is a FLIGHT CREW Operations Manuals, not a DEVELOPERS manual... you need to look a bit further than that. Or just listen to some real pilots instead of constantly prooving ignorance.

Scholli04 wrote on Jun 13^th, 2020 at 6:27am:

The page posted is the best proof.

That page proves nothing, because it's just an piece of information with zero reference to the CS767.

Again, the question is: What exactly works not as per the Manual pls?
AIIR #4,5,6 https://www.captainsim.org/forum/csf.pl?num=1588001095

Alex T wrote on Jun 12^th, 2020 at 7:42pm:

If they're saying it comes on right after takeoff with no obstacles around

They think there are no obstacles around but we need proofs.