Question for CRJ Drivers
01-17-2018, 07:59 AM
#1
Gets Weekends Off
Thread Starter
Joined APC: Mar 2015
Posts: 351
Question for CRJ Drivers
Do you guys do Continuous Descent Arrivals on RNAV approaches using the advisory VNAV snowflake? If so, does it work better than dive and drive? Would you say there's a difference in unstable approach rates for using advisory VNAV vs dive and drive?
Thanks guys, appreciate any insights.
Thanks guys, appreciate any insights.
01-17-2018, 09:06 AM
#2
Gets Weekends Off
Joined APC: Jul 2015
Posts: 667
Do you guys do Continuous Descent Arrivals on RNAV approaches using the advisory VNAV snowflake? If so, does it work better than dive and drive? Would you say there's a difference in unstable approach rates for using advisory VNAV vs dive and drive?
Thanks guys, appreciate any insights.
Thanks guys, appreciate any insights.
01-17-2018, 09:33 AM
#3
Prime Minister/Moderator
Joined APC: Jan 2006
Position: Engines Turn Or People Swim
Posts: 40,090
FAA doesn't like dive and drive anymore.
We would use a continuous descent, but based on a calculated VS, vice the snowflake. Don't think the snowflake is certified for VNAV, can't recall if it even appears when an RNAV approach is selected?
We would use a continuous descent, but based on a calculated VS, vice the snowflake. Don't think the snowflake is certified for VNAV, can't recall if it even appears when an RNAV approach is selected?
01-17-2018, 10:11 AM
#4
Gets Weekends Off
Joined APC: Sep 2016
Posts: 1,954
It's "advisory" for VNAV. Not temperature compensated and it leads you to the threshold.
01-18-2018, 08:31 AM
#7
Gets Weekends Off
Joined APC: Oct 2013
Posts: 1,083
Do you guys do Continuous Descent Arrivals on RNAV approaches using the advisory VNAV snowflake? If so, does it work better than dive and drive? Would you say there's a difference in unstable approach rates for using advisory VNAV vs dive and drive?
Thanks guys, appreciate any insights.
Thanks guys, appreciate any insights.
01-18-2018, 04:41 PM
#8
Gets Weekends Off
Joined APC: Dec 2006
Position: 737 FO
Posts: 2,370
On an RNAV star the snowflake goes to the next hard altitude while respecting any restrictions (above or below) to reach it. There is an option for a VNAV button so the airplane will actually follow it but I don't think any US operators were willing to pay for it. It also doesn't account for you having to change speeds for speed restrictions, just is showing you where you are relative to a 3 degree path to the altitude accounting for other altitude restrictions.
01-18-2018, 06:13 PM
#9
Gets Weekends Off
Joined APC: Oct 2013
Posts: 1,083
On an RNAV star the snowflake goes to the next hard altitude while respecting any restrictions (above or below) to reach it. There is an option for a VNAV button so the airplane will actually follow it but I don't think any US operators were willing to pay for it. It also doesn't account for you having to change speeds for speed restrictions, just is showing you where you are relative to a 3 degree path to the altitude accounting for other altitude restrictions.
Lots of US operators have VNAV equipped CRJs, including my company.
01-18-2018, 10:03 PM
#10
Gets Weekends Off
Joined APC: Aug 2016
Posts: 130
Most of the time the snowflake gives you 4 reds on an rnav approach so I learned not to trust it. Follow the banana. Also, bombardier in all their wisdom decided to either allow us to see fuel remaining at the destination OR advisory VNAV on our MFD so one pilot is watching fuel, the other watching descent rate. It's a wonderfully terrible set of avionics.
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