Adherence To Clearance (Climbs Descents)
06-27-2017, 12:05 PM
#11
In a land of unicorns
Joined APC: Apr 2014
Position: Whale FO
Posts: 6,468
I've done a lot of my IFR flying in a C150 so I have some experience in not meeting 500fpm climb. ATC does ask you if you stopped climbing if you only get 300fpm or so. I just read back any altitude change "climb and maintain 5000, maximum climb rate 300fpm". Never been a problem.
07-01-2017, 11:48 AM
#12
Gets Weekends Off
Joined APC: May 2010
Position: Baja Vermont
Posts: 5,177
perfInit,
Don't confuse TERPS (approach and departure design) with ATC enroute rates. There are minimum climb graidients for Victor airways, tho. I think it's 150'/nm below 6,000' MSL, 120'/nm between 6,000' and 10,000' and 100'/nm up to .17,999'.
AIM 4-4-10,
GF
Don't confuse TERPS (approach and departure design) with ATC enroute rates. There are minimum climb graidients for Victor airways, tho. I think it's 150'/nm below 6,000' MSL, 120'/nm between 6,000' and 10,000' and 100'/nm up to .17,999'.
AIM 4-4-10,
d. When ATC has not used the term “AT PILOT’S DISCRETION” nor imposed any climb or descent restrictions, pilots should initiate climb or descent promptly on acknowledgement of the clearance. Descend or climb at an optimum rate consistent with the operating characteristics of the aircraft to 1,000 feet above or below the assigned altitude, and then attempt to descend or climb at a rate of between 500 and 1,500 fpm until the assigned altitude is reached. If at anytime the pilot is unable to climb or descend at a rate of at least 500 feet a minute, advise ATC. If it is necessary to level off at an intermediate altitude during climb or descent, advise ATC, except when leveling off at 10,000 feet MSL on descent, or 2,500 feet above airport elevation (prior to entering a Class C or Class D surface area), when required for speed reduction.
07-07-2017, 10:02 PM
#13
Gets Weekends Off
Joined APC: Sep 2012
Posts: 488
Originally Posted by WhiskeyDelta
Weird, the default descent rate for the 737 in VNAV is only 1000FPM until it captures the path and goes to idle. ATC never says a word.
Yup...if atc needs a good rate down they usually say so in the clearance. Otherwise if I am below path it's 1000 fpm...and never hear a peep about it. Rick is ill informed...
07-08-2017, 04:41 PM
#14
Organizational Learning
Joined APC: Nov 2005
Position: Directly behind the combiner
Posts: 4,948
Originally Posted by PurpleToolBox
Originally Posted by rickair7777
Descend at least 1500fpm on an unrestricted decent of more than 1000ft. If you don't maintain at least that you could mess up the controllers planning and create a conflict.
The answer is, it's not. At least, it's not written in anything authored by the FAA. If specific guidance WERE written, we would have a reference and a clear answer.
Instead we're left to debate the meaning of optimum. Until the FAA comes up with a definition, I will determine what's optimum for me in the particular situation when I receive such a clearance. If the controller needs something more specific for traffic clearance or LOA compliance or whatever other reason, I'll gladly comply with his specific instructions.
My FMS defaults to 750 feet per minute if I begin the descent early. Works for Honeywell, works for me. Works good, lasts long time.
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