FMC & SLOP
Joined: Jun 2000
Posts: 819
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From: Canada
Generally speaking, when an offset is deleted, the FMS navigation guidance should command an appropriate heading to re-intercept the original course at 45 degrees.
Consult your various FMCS User Guide for more accurate information.
Willie
Consult your various FMCS User Guide for more accurate information.
Willie
Joined: Mar 2002
Aviation Qualifications: ATPL
Posts: 9,226
Likes: 994
From: Seat 1A
Who cares, big picture stuff really.
My Boeing turns to re-intercept the original route "at up to 45°".
Joined: Oct 2006
Posts: 658
Likes: 1
From: Ankh Morpork, DW
Who cares, big picture stuff really.
It doesn't really matter what the parameters are you should be in control and watching what it does.......if you don't like what you see then go selected.....
It doesn't really matter what the parameters are you should be in control and watching what it does.......if you don't like what you see then go selected.....
My company actually doesn't want us to go out of LNAV if you're doing oceanic nav.
Thread Starter
Joined: Mar 2011
Posts: 1,407
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From: engineer at large
Thanks for all the informative replies...
As many of you know, I design RNP procedures. What I am looking at is a single RNP track, but with offset approaches for wake turbulence separation. The standard would be to have completely separate procedures, but then ATC has to track many more waypoints, so I am working up this concept...
While I did find significant verbiage on engaging the offset, there was little in the way of parameters when removing the offset. Horizontal return is somewhat detailed, but in actual operation, 'up to' can be very different.
In addition, and to be more specific, if the AC is on descent, will the FMC allow the removal of the offset while on auto?
Thanks in advance.
As many of you know, I design RNP procedures. What I am looking at is a single RNP track, but with offset approaches for wake turbulence separation. The standard would be to have completely separate procedures, but then ATC has to track many more waypoints, so I am working up this concept...
While I did find significant verbiage on engaging the offset, there was little in the way of parameters when removing the offset. Horizontal return is somewhat detailed, but in actual operation, 'up to' can be very different.
In addition, and to be more specific, if the AC is on descent, will the FMC allow the removal of the offset while on auto?
Thanks in advance.
Joined: Sep 1998
Posts: 1,615
Likes: 1
From: wherever
The Honeywell FMS as fitted to Ejets does not allow the use of offset when on published procedures. It will cancel any when approaching the first waypont of the procedure so to include the use of automatic offset in a procedure may prove troublesome ;-)
Joined: Oct 2006
Posts: 658
Likes: 1
From: Ankh Morpork, DW
In addition, and to be more specific, if the AC is on descent, will the FMC allow the removal of the offset while on auto?
I believe on the 737, the offset will end at the FAF unless you specify an earlier waypoint. You can also cancel the offset or just go direct to the next waypoint, which cancels any subsequent offset.
