Go Back  PPRuNe Forums > Flight Deck Forums > Tech Log
Reload this Page >

Climb gradient questions.

Tech Log The very best in practical technical discussion on the web

Climb gradient questions.

Old 29th Sep 2012, 18:25
  #1 (permalink)  
Thread Starter
 
Join Date: Sep 2011
Location: EVERYWHERE
Posts: 55
Likes: 0
Received 0 Likes on 0 Posts
Climb gradient questions.

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.
meatlover is offline  
Old 29th Sep 2012, 18:29
  #2 (permalink)  
 
Join Date: Sep 2010
Location: England
Posts: 1,955
Likes: 0
Received 0 Likes on 0 Posts
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.
Lord Spandex Masher is offline  
Old 29th Sep 2012, 18:49
  #3 (permalink)  

ECON cruise, LR cruise...
 
Join Date: Apr 2002
Location: MIRSI hold - give or take...
Age: 52
Posts: 568
Likes: 0
Received 0 Likes on 0 Posts
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.
Empty Cruise is offline  
Old 29th Sep 2012, 20:22
  #4 (permalink)  
 
Join Date: Dec 2002
Location: Where the Quaboag River flows, USA
Age: 71
Posts: 3,409
Received 3 Likes on 3 Posts
The 2.4% gradient, twins, greater for tris and quads, is strictly for meeting certification, unrelated to obstacle clearance. The two are different.

GF
galaxy flyer is online now  
Old 30th Sep 2012, 14:41
  #5 (permalink)  
Guest
 
Join Date: Apr 2009
Location: On the Beach
Posts: 3,336
Likes: 0
Received 0 Likes on 0 Posts
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)
aterpster is offline  
Old 30th Sep 2012, 20:09
  #6 (permalink)  
JIC
 
Join Date: Sep 2004
Location: Europe
Posts: 59
Likes: 0
Received 0 Likes on 0 Posts
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...
JIC is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.