Terrain Inhibit button lighting up

[Bert Pieke 7,584]

If you have trouble with the Terr Inhib button lighting up and not going out when clicking on it, let me know so I can send you a link to a fixed Interior Model file.

For those who are comfortable hex editing the file, here are the changes (two instances in the file):

(A:ELECTRICAL MASTER BATTERY,bool) (A:CIRCUIT GENERAL PANEL ON, bool) if{

(L:ASD_BTN_TERR_INHID_850XP,number)  and if{ 1 } els{ 0 } } els{ 0 }

Cleaned up:

(A:ELECTRICAL MASTER BATTERY,bool) (A:CIRCUIT GENERAL PANEL ON, bool) and

(L:ASD_BTN_TERR_INHID_850XP,number)  and if{ 1 } els{ 0 }

 

Edited September 7, 2019 by Bert Pieke

[Bert Pieke 7,584]

On 9/7/2019 at 9:54 AM, Bert Pieke said:

If you have trouble with the Terr Inhib button lighting up and not going out when clicking on it, let me know so I can send you a link to a fixed Interior Model file.

For those who are comfortable hex editing the file, here are the changes (two instances in the file):

(A:ELECTRICAL MASTER BATTERY,bool) (A:CIRCUIT GENERAL PANEL ON, bool) if{

(L:ASD_BTN_TERR_INHID_850XP,number)  and if{ 1 } els{ 0 } } els{ 0 }

Cleaned up:

(A:ELECTRICAL MASTER BATTERY,bool) (A:CIRCUIT GENERAL PANEL ON, bool) and

(L:ASD_BTN_TERR_INHID_850XP,number)  and if{ 1 } els{ 0 }

 

Even better:

(A:ELECTRICAL MASTER BATTERY,bool) (A:CIRCUIT GENERAL PANEL ON, bool) and

(L:ASD_BTN_TERR_INHID_850XP,bool)  and if{ 1 } els{ 0 }

and, if you would like the button to light up when reaching Decision Height, as it is supposed to,

also edit the GaugePC12\Gauge_Update.xml file:

(A:ELECTRICAL MASTER BATTERY,bool) (A:CIRCUIT GENERAL PANEL ON, bool) and
(A:RADIO HEIGHT,feet) (A:DECISION HEIGHT,FEET) - abs 5 <  and
(A:FLAPS HANDLE PERCENT,PERCENT) 10 > and
(A:GEAR CENTER POSITION,percent) 50 > and
(A:VERTICAL SPEED,ft/min) 0 < and
(A:SIM ON GROUND,bool) ! and
(L:ASD_BTN_TERR_INHID_850XP,bool) ! and
if{ 1 (>L:BUFFER_PC12_Dh,number)  1 (>L:ASD_BTN_TERR_INHID_850XP,bool) }

 

Edited September 10, 2019 by Bert Pieke

[FDEdev 955]

Why does the terrain inhibit button light up when reaching the decision height?

[Bert Pieke 7,584]

1 hour ago, FDEdev said:

Why does the terrain inhibit button light up when reaching the decision height?

I do not know.. that is the way that Carenado coded it..

Let see if someone has a Pilot's Guide for the PC12..

[FDEdev 955]

I've got three different PC-12 manuals but none of them mentions this 'feature'. It would be very unusual if a totally unrelated light/switch would activate in an aircraft.

Don't have the PC-12 installed, but doesn't the DH/DA show up on the PFD when reaching the set minimum?

Edited September 11, 2019 by FDEdev

[Bert Pieke 7,584]

From the PC12 Pilot's Guide:

"The purpose of the TERR INHIBIT is to allow the aircraft to operate without nuisance or unwanted caution/warnings, for example at airports that are not in the system terrain database i.e. runways shorter than 2000 feet. The terrain inhibit switch should not be operated for normal flight operations."

Maybe the thought is that when you are at decision height, gear down, flaps down, no further terrain warnings are wanted..

Edited September 11, 2019 by Bert Pieke

[FDEdev 955]

A Carenado thought maybe, but certainly not a Pilatus thought 😉  

Edited September 11, 2019 by FDEdev

[Bert Pieke 7,584]

1 minute ago, FDEdev said:

A Carenado thought maybe 😉  

Could well be..

[FDEdev 955]

It would be rather startling to see anything terrain related (except DA/DH) to light up close to the minimum. 

[Bert Pieke 7,584]

10 hours ago, FDEdev said:

It would be rather startling to see anything terrain related (except DA/DH) to light up close to the minimum. 

It is not a warning, but an indication that TAWS has been switched off.

I agree.. if the real plane does not do this, it makes no sense in the simulator either..

[FDEdev 955]

1 hour ago, Bert Pieke said:

It is not a warning, but an indication that TAWS has been switched off.

That's why it would be startling. Imagine that you are approaching the minimum in bad weather without any visibility or visual cues and you know that a go-around in zero viz is approaching rapidly. 

And as soon as you are deciding to go-around the damned TAWS switches off on its own or fails, exactly at the most critical point of the flight.