Climb gradient questions.

[meatlover]

Firstly, I Remember reading that for a 2 engine aircraft with one engine out, the climb gradient shall not be less than 2.4%. Is this correct?
Secondly I believe most SIDs require a climb gradient of 3.3%, now if the SID requires a climb gradient of 7%, how do I know if I can make this?
Single engine is okay, since you have an engine out SID in that case.

May be a stupid ques for a lot of you, I would appreciate the help nevertheless.

[Lord Spandex Masher]

Some SID charts will show you a table of speed versus climb rate which will meet the SID requirements.

Also, in one of your company manuals you should be able to find climb gradient charts.

[Empty Cruise]

What sort of aircraft are we talking? SEP or Far/JAA25?

if -25, then your AFM will have climb gradient tables to show what you can do OEI. If you plan on following the SIDs as your engine-out procedure, you ae legally entitled to remove the 0.8% IOC from the SID, i.e. for a 7% SID you'd enter with 6.2% to arrive at limiting TOM.

[galaxy flyer]

The 2.4% gradient, twins, greater for tris and quads, is strictly for meeting certification, unrelated to obstacle clearance. The two are different.

GF

[aterpster]

gf:

The 2.4% gradient, twins, greater for tris and quads, is strictly for meeting certification, unrelated to obstacle clearance. The two are different.

Indeed, the Part 25 takeoff flight path is a certification requirement. Then, however, it becomes an operating requirement for the takeoff flight path in commercial operations. (FAR 121.189, et al)

[JIC]

When you sit in the cockpit and think of this you can use this MDR formular

ROC = CLB% x GS

ROC = 7 x 100

ROC = 700'/min

Nice and easy.

About the 2,4%, it is correct...