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  #1  
Old 06-14-2016, 09:25 AM
1001001's Avatar
1001001 1001001 is offline
 
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Default Why does Lockheed Martin change my departure time (and equipment suffix, and routing)

I have noticed recently that when filing IFR flight plans through Garmin Pilot / Lockheed Martin FS, my departure time seems to always be automatically incremented by 10 minutes. If I file an 0600 departure, I get 0610. 1500=1510.

Additionally, when filing, I have received a routing that was completely different that what I filed, and well out of the way. I didn't think much of that since I assumed that ATC was just trying to keep me out of the way of morning traffic arriving and departing Pittsburgh, but then after the Clearance Delivery guy made me copy a whole new route, he gave me a departure heading pointed at my last filed fix and then immediately cleared me direct to it after I was airborne.

Seems rather inefficient.

Also, the last few times I have filed, the flight plan has left off my equipment suffix.

NOTE THAT After filing with Garmin Pilot, I receive and email with a flight plan form with all the correct information, but it seems to get left off and changed soewhere down the road.

Has anyone else seen this more frequently lately?
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  #2  
Old 06-14-2016, 01:06 PM
BobTurner BobTurner is offline
 
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Location: Livermore, CA
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Default

Often small airports near big ones have "preferred routes" designed to keep you away from the big airport traffic. e.g., here at LVK we are east of SFO. Monterey is south-southwest. But no matter what I file the computer will give me the preferred route to MRY - flying east! Often ATC will give me a more direct route once airborn, traffic permitting.
The other questions, I have no answer for.
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  #3  
Old 06-14-2016, 01:21 PM
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KleensRV6 KleensRV6 is offline
 
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Try calling 1 800 992-7433 (Lockheed Flight Service) and ask for the floor supervisor. Explain your last filed IFR, what process you are using, and hear what they have to say. There are many reasons routing can be changed but until you go to the source there may be more confusion than straight answers.

Cheers,
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  #4  
Old 06-14-2016, 03:57 PM
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Quote:
Originally Posted by KleensRV6 View Post
Try calling 1 800 992-7433 (Lockheed Flight Service) and ask for the floor supervisor. Explain your last filed IFR, what process you are using, and hear what they have to say. There are many reasons routing can be changed but until you go to the source there may be more confusion than straight answers.

Cheers,
I'll give it a try. Never thought to ask FSS for a supervisor.
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  #5  
Old 06-15-2016, 06:25 AM
turbosaaber turbosaaber is offline
 
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Talking automation

FSS will not be able to help you on your quest as the reason you receive a different route other than filed is due to our automation(FAA). We try to keep departures and arrivals procedurally separated. When you file your flight plan, ERAM, our computer, makes a flight plan and probes it, one it crosses a line setup to catch departures or arrivals it automatically converts it to the correct route( ADR, AAR, or ADAR) Automatic Departure Route, Automatic Arrival Route, or Automatic Departure and Arrival Route. As I said before this is triggered by a line that we place to catch strays, we also trigger the route by departure point and or departure and arrival point. This route is in addition to a SID as well usually. When flight planning please check preferred departures or routes. Some flight planning software will show you flight plans who have filed same route so may give you an indication of what you should be filing to help the system. I might add this whole process is designed to keep aircraft separated in busy environments. I hope this helps, and if you have any questions please ask... I'm a controller at Miami ARTCC so no hate mail plz.....
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  #6  
Old 06-15-2016, 06:34 AM
turbosaaber turbosaaber is offline
 
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Default equipment suffix

Our old system gave us the ability to change equipment suffix easily but now the computer looks at each component of your equipment and aircraft capabilities to determine the correct suffix. This is due to more equipment in the National airspace system. If you need more information we can go deeper into the system but that is the short story. Controllers don't like this aspect of the system either, we have to change many things in your flight plan to get the desired outcome. Big pain when we are busy.
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  #7  
Old 06-15-2016, 06:46 AM
TFeeney TFeeney is offline
 
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Quote:
Originally Posted by turbosaaber View Post
When flight planning please check preferred departures or routes. Some flight planning software will show you flight plans who have filed same route so may give you an indication of what you should be filing to help the system. I might add this whole process is designed to keep aircraft separated in busy environments.
Carl - no hate here, I'm happy to have the chance to clarify things like this. The question for me is that if I file for a route from Point A to Point B, I'd obviously like to fly it direct. If however I file a great circle routing with 16 points in between (like many of the previous flight plans on same route), I'm guaranteed to have to fly it. In my mind, its a roll of the dice and sometimes I'll get lucky with the direct route.

Help me with that logic. Maybe its something simple I'm missing. I'm sure others are thinking similar.
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  #8  
Old 06-15-2016, 06:49 AM
turbosaaber turbosaaber is offline
 
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Default departure times

OK, when you file your IFR with a P time of xxxx, your flight plan is now in the system but will not assign a discrete beacon code to your flight plan until 30 min prior to your proposed departure time. If you call Clearance Delivery prior to 30 min prior the controller will amend your time so we can give you a code and issue your clearance. Not too detrimental as we have adapted a 2.5 hour flight plan drop interval meaning that after 2.5 hours after your proposed departure time your flight plan will drop out of the system and you will have to refile. Each ARTCC may set this drop interval to a different time but 2.5 is pretty standard. Why do we not assign a code when your fight plan is created? Simple there are only 2096 codes, less actually so we don't want to use them all. Why 2.5 as a drop interval, we use this to save codes as well. Hope this helps in your understanding of our system....
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  #9  
Old 06-15-2016, 06:53 AM
turbosaaber turbosaaber is offline
 
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Default direct

We would like to give you direct but it is based on traffic congestion and flow. We take you out on certain routes because it is safe, if you go NORDO at least you are not flying head on with a 777 which might hurt. We have many reasons why we do what we do but it is normally about keeping aircraft separated. Each area may have different traffic flows and it will change with runway configurations.
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  #10  
Old 06-15-2016, 06:55 AM
turbosaaber turbosaaber is offline
 
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Default ask

Ask for direct, worst we can say is No, if you don't get your request perhaps the controller will put you on a heading or give you a different fix further on your route which he can permit based on traffic.
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