C Series Info
11-14-2017, 09:06 AM
#1612
Gets Weekends Off
Joined APC: May 2015
Position: Power top
Posts: 2,960
11-14-2017, 09:18 AM
#1613
Gets Weekends Off
Joined APC: Mar 2005
Posts: 1,947
No, it doesn't.
Managed descent requires a lower altitude to be selected in the window. Then the knob is pushed which starts a shallow descent until the idle path is intercepted. NAV remains active.
A predetermined altitude of 15000, xpdr emergency code, heading hold mode, as well as the function of engaging the AP and AT if they were off, is vastly different than managed descent.
Managed descent requires a lower altitude to be selected in the window. Then the knob is pushed which starts a shallow descent until the idle path is intercepted. NAV remains active.
A predetermined altitude of 15000, xpdr emergency code, heading hold mode, as well as the function of engaging the AP and AT if they were off, is vastly different than managed descent.
11-14-2017, 09:23 AM
#1614
Gets Weekends Off
Thread Starter
Joined APC: Dec 2009
Position: Stay THIRSTY, my friends!
Posts: 1,898
Hilarious. I think this auto descent thing on the C series will engage if the aircraft loses pressurization above a certain altitude and no action is taken by the crew for a certain time period. Pretty slick, unless you're over the Andes or Himalayas.
11-14-2017, 09:23 AM
#1615
Da Hudge
Joined APC: Oct 2006
Position: Poodle Whisperer
Posts: 17,473
The auto pitch trim ran the trim full nose up as the aircraft decelerated. Recovery with full nose up trim was doubtful even with the sticks full forward. Most of the time the sticks were counter to each other resulting in a neutral elevator with the stab full nose up. Never going to recover in that situation.
Pop quiz, sailing: in ALT 2, is auto pitch trim available? If so, what does it do when you shove the stick forward?
11-14-2017, 09:24 AM
#1616
Da Hudge
Joined APC: Oct 2006
Position: Poodle Whisperer
Posts: 17,473
Yep! The gulfstreams have a similar function.
11-14-2017, 09:25 AM
#1617
Gets Weekends Off
Joined APC: Jun 2014
Posts: 679
To answer your question, no, going down isn’t hard.
In return I’ll ask you:
Is manually loading the box that hard?
Is manually setting thrust that hard?
Is calculating and managing a descent that hard?
I don’t know about you, but I’d much rather punch a button or two to accomplish a task.
In return I’ll ask you:
Is manually loading the box that hard?
Is manually setting thrust that hard?
Is calculating and managing a descent that hard?
I don’t know about you, but I’d much rather punch a button or two to accomplish a task.
11-14-2017, 09:29 AM
#1618
Gets Weekends Off
Thread Starter
Joined APC: Dec 2009
Position: Stay THIRSTY, my friends!
Posts: 1,898
11-14-2017, 09:52 AM
#1619
Gets Weekends Off
Joined APC: Feb 2008
Posts: 19,608
Auto pitch trim is available in alternate and alternate 2. When you shove the stick forward it will start trimming the stab down. However if you approach 5 to 10 knots above stall pitch goes into direct law and disables automatic pitch trim and you should get a caution on the Attitude indicated to use manual trim. If in alternate law the sticks are held opposite each other the stabilizer trim will remain fixed.
11-14-2017, 09:54 AM
#1620
veut gagner à la loterie
Joined APC: Apr 2008
Position: Light Chop
Posts: 23,286
The auto pitch trim ran the trim full nose up as the aircraft decelerated. Recovery with full nose up trim was doubtful even with the sticks full forward. Most of the time the sticks were counter to each other resulting in a neutral elevator with the stab full nose up. Never going to recover in that situation.
Anyways, the unreliable airspeed happened, the airplane went into alternate law 2, the FO proceeded to climb from 350 to 370. At 37400 he pulled the power down and the airplane stalled. He did a lot of back elevator at that point. The THS was -3 the whole time.
It was stalled until it crashed. The THS slowly moved while stalled and the FO applying aft stick to full aft stick. Only for a moment towards the end did you have forward stick by Captain and aft by FO. The airplane was already descending near 7000 fpm and flat.
Are you saying sailing that the airplane just ran the THS to -13 on it's own for no reason?
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