Glide Slope Service Volume
09-29-2019, 08:13 AM
#2
Gets Weekends Off
Joined APC: Oct 2008
Position: JAFO- First Observer
Posts: 997
IIRC, If there was a specific operational or TERPS reason for an expanded GS service volume, expanded GS service volume (>10nm) would be indicated as a Chart Note and/or depicted as part of the procedure in the profile view. Another clue would be the distance of the FAF to the Threshold and associated published GS intercept altitude (the lightning bolt symbol). Flight Check would have to document this “SAT” on the Flight Inspection report as part of the procedure package documentation.
09-29-2019, 12:24 PM
#3
Gets Weekends Off
Joined APC: Mar 2008
Position: FAA 'Flight Check'
Posts: 13,837
There are lots of ways for you to GUESS that there might be a GS ESV, but the only way to really KNOW is looking at the facility datasheet which is not public (I don't know why it isn't anymore).
Do you have a question about a specific facility?
Do you have a question about a specific facility?
09-30-2019, 08:04 AM
#4
Gets Weekends Off
Joined APC: Jul 2019
Posts: 386
Originally Posted by USMCFLYR
There are lots of ways for you to GUESS that there might be a GS ESV, but the only way to really KNOW is looking at the facility datasheet which is not public (I don't know why it isn't anymore).
Do you have a question about a specific facility?
Do you have a question about a specific facility?
09-30-2019, 08:19 AM
#6
Gets Weekends Off
Joined APC: Mar 2008
Position: FAA 'Flight Check'
Posts: 13,837
Originally Posted by APCHCLIMB
Side question. A lot of guys use the GS for pattern work (i.e. on the downwind or base to final). I know the GS is a "fan". But how wise is this?
On an unrestricted facility, as you come around the corner you should be getting useable GS information to use as a reference.
This service volume closely equates to a commissioned VGSI's unrestricted service volume too.
So both can/should be used as references as well as an eyeball calibration looking outside in a visual landing pattern.
09-30-2019, 12:57 PM
#7
Prime Minister/Moderator
Joined APC: Jan 2006
Position: Engines Turn Or People Swim
Posts: 39,232
Originally Posted by APCHCLIMB
Side question. A lot of guys use the GS for pattern work (i.e. on the downwind or base to final). I know the GS is a "fan". But how wise is this?
If your pattern is out to lunch, you might get a false GS.
Also seems to work OK late in the downwind, as you approach base but I don't trust it, I just reference the crossing altitude for my abeam fix.
10-03-2019, 07:50 AM
#8
Line Holder
Thread Starter
Joined APC: Feb 2009
Posts: 39
Originally Posted by USMCFLYR
There are lots of ways for you to GUESS that there might be a GS ESV, but the only way to really KNOW is looking at the facility datasheet which is not public (I don't know why it isn't anymore).
Do you have a question about a specific facility?
Do you have a question about a specific facility?
10-10-2019, 05:59 PM
#9
In a land of unicorns
Joined APC: Apr 2014
Position: Whale FO
Posts: 6,458
Originally Posted by whiskeycharlie
Thanks for the responses. No, I'm just trying to comply with the AIM's guidance, but I don't think many of the people I fly with are aware of the potential implications of arming the g/s beyond 10 NM or while approaching intermediate waypoints prior to the FAF, whether on an ILS, or even visual approach. Obstacle clearance, Class B airspace, corridor separation, SIPIA compliance, not to mention signal reliability...
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