Gulfstream loss of cabin pressure question

[JimNtexas]

Howdy,

I was talking about high altitude flight with a friend the other day, and this possible factoid popped into my mind.

I have a memory of having read somewhere that some Gulfstreams are so smart that if they lose cabin pressure and the pilots don't react, then the airplane on its own will turn 45 degrees, squawk 7700, and descend.

Is this really the case, or is my imagination running away with me?

 

[g4800xp]

I know my G4 won't but I think the G5 and the Global will, as well as some Lear Jets, all the about can get to FL510.

 

[blzr]

Saw a Global yesterday in PBI. What do you have to major in in college to buy one of those babys? Thing must be a couple of Mil at least.

 

[gear goes down]

why whould it turn 45 degrees???

 

[ExpWayVis31]

why whould it turn 45 degrees???

To get you off the airway

 

[banned username 2]

Howdy,

I was talking about high altitude flight with a friend the other day, and this possible factoid popped into my mind.

I have a memory of having read somewhere that some Gulfstreams are so smart that if they lose cabin pressure and the pilots don't react, then the airplane on its own will turn 45 degrees, squawk 7700, and descend.

Is this really the case, or is my imagination running away with me?

The G-V will (if autopilot and autothrottles are engaged) and you are above FL410 and the cabin loses pressure, the autothrottles will come to idle, the aircraft will turn 90° to the left and it will descend at Mmo/Vmo to 15,000 ft and level off. The G-550 will engage the autothrottles and autopilot if they are disengaged and do the same thing...

 

[nwa_contrails]

Straight from Google and Gulfstream:

"The G500 also provides an exceptional, advanced safety feature, the Automatic Emergency Descent Mode, builtinto the Flight Management System. In the unlikely event of a rapid cabin depressurization at 40,000 feet orabove, coupled with crew incapacitation, the G500 will automatically turn and descend to a safe altitude of 15,000feet and a speed of 250 knots. This allows the flight crew to regain consciousness and resume control of theaircraft with plenty of altitude to spare. The G500, along with the Gulfstream G550, are the only aircraft in the ultra-long-range class to offer this extraordinary level of safety for your passengers and crew."
http://www.gulfstream.com/_forms/_brochures/mini/3355_g500_mini_reprint.pdf

Pretty cool, never knew about that...

 

[nwa_contrails]

Damn you beat me to it!

 

[paulsalem]

What if your over mountinus terrain that exceeds 15,000 feet? Will the GPWS over ride it?

 

[sigler]

The G-V will (if autopilot and autothrottles are engaged) and you are above FL410 and the cabin loses pressure, the autothrottles will come to idle, the aircraft will turn 90° to the left and it will descend at Mmo/Vmo to 15,000 ft and level off. The G-550 will engage the autothrottles and autopilot if they are disengaged and do the same thing...

Just a couple of things: on the Automatic Descent Mode, the G-550 will not engage the autopilot, just the autothottle (not that anyone ever flies with the A/P disengaged above 400 anyway). And once level at 15000, the speed goes to 250 kts.