Problems with VFLC
02-16-2013 | 09:08 AM
#1
Thread Starter
New Hire
Joined: Feb 2013
Posts: 4
Likes: 0
Problems with VFLC
Hello all,
Has anyone experienced this. Usually when I climb out on departure, a few thousand feet up when I engage the auto-pilot, I will also set it to FLC. The aircraft I fly is 250/.63 and through about 10,000 will hit VNAV and VFLC shows up on the EADI.
There are times where I will notice (after it should have transitioned) the nose will pitch way up, so I take it out of VFLC and slow the rate down with VS.
Has anyone experienced this, and why? If I am holding the recommended climb speed, should it not transition smoothly?
Thanks.
Has anyone experienced this. Usually when I climb out on departure, a few thousand feet up when I engage the auto-pilot, I will also set it to FLC. The aircraft I fly is 250/.63 and through about 10,000 will hit VNAV and VFLC shows up on the EADI.
There are times where I will notice (after it should have transitioned) the nose will pitch way up, so I take it out of VFLC and slow the rate down with VS.
Has anyone experienced this, and why? If I am holding the recommended climb speed, should it not transition smoothly?
Thanks.
02-18-2013 | 06:08 PM
#2
Gets Weekends Off
Joined: Feb 2013
Posts: 210
Likes: 0
From: BD-700A
Depends entirley on the equipment you are flying. We use VFLC but have manual speeds set for our auto throttles. Above FL200 we will transition to vertical speed but if you have auto throttles its easy to transition altitudes without it screaming for whatever you have set in your box and setting a climb schedule of your choice.
02-18-2013 | 06:37 PM
#3
Chief Jeppesen Updater
Joined: Oct 2005
Posts: 3,080
Likes: 0
From: Executive Transport Driver
Except for the very rare occassion or in training (engine out), I pretty much never have used FLCH mode in the aircraft I fly/have flown (4 different types).
It just isn't comfortable for the passengers, especially if there are large wind changes aloft or mountain wave.
It just isn't comfortable for the passengers, especially if there are large wind changes aloft or mountain wave.
08-09-2013 | 07:13 PM
#5
Gets Weekends Off
Joined: May 2010
Posts: 5,244
Likes: 2
From: Baja Vermont
Remember what FLC (VFLCH) does--speed control using pitch. It controls pitch with the elevators followed by the necessary trim. Power is assumed to be constant, either idle or climb power, depending on whether going up or down. If airspeed at engagement is very different than that programmed, up or down goes the plane. If airspeed is varying, due to turbulence or atmospheric conditions (temp, being primary one) the autopilot will use pitch to maintain the speed.
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