Is “Reverse Taxi” approved at Envoy?
06-05-2021, 07:14 AM
#31
Gets Weekends Off
Joined APC: Sep 2019
Posts: 300
Ground lead was never allowed to give us the “Stop” signal while backing. Instead, it was a “come forward” signal that he/she would give if we needed to stop immediately while powerbacking. With our feet on the floor, the captain would close the reversers and add something like 1.2 EPR(DC-9/717) to stop backwards movement and come to a stop. Nighttime power backs were always interesting. It is like those runway turnoff lights on the Douglas (they had a momentary push in type action and were placed on the forward fuselage) were designed for the wave off signal at night during power back/taxi clearance. Was fun while it lasted.
06-06-2021, 05:08 AM
#32
Gets Weekends Off
Joined APC: Nov 2017
Position: NYC 7ERA
Posts: 1,966
Originally Posted by EasternATC
Jumpseating once in a DC9 that powered back, I asked this question, and was told that it was an urban legend. Kind of makes sense, as a proper CG will be always be ahead of the main gear.
Height of CG factors into the tendency to stand on tail, not just fore-aft.
If your CG is only 1 foot forward of the MLG, but the CG is 4 feet ABOVE the rotation point (tire on single axle, truck pivot on a double axle truck), any braking applied via wheels above about 1/4g will start the nose up, and as the nose goes up, the distance from the CG to pivot decreases, further reduces the 'put nose back down' moment and will eventually hit the point where it will sit on the tail no matter what you do.
We stopped rearward motion by taking props out of reverse.
Add in heavy deck motion and it would get interesting.
Sent from my SM-G965U1 using Tapatalk
Thread
Thread Starter
Forum
Replies
Last Post
