Requested time overhead on the E190

[Broomstick Flier]

Chaps,

After exausting the resources I have on hands, (FMS user's manual) I will need some expert's advice with the programming of the E190 FMS to accomodate a request from ATC to reach a given intersection at a specific time, i.e. "Reach ABCDE no later than 1900Z" or "after 1902Z"

After browsing through the pages of the manual I had the impression this is not possible via FMS, but would require some manual speed control.

Thanks for the usual help!
Cheers
BF

[Sydy]

RTA - Requested Time of Arrival is not available not, but it will be in the future fms software updates! I know it isnin the Road Plan.

All the best,

Sydy

[Broomstick Flier]

Thanks!

Waiting then...

[hawker750]

Broomstick
For heaven's sake why are you asking such a daft question. Ever since the abacus if you divide distance by speed you get time to a point. You could even get the speed you need by dividing distance by the required time to the point x 60. This is sub GCSE
maths. Why on earth do you need an FMS to tell you this? Another example of pilots becoming computer operators...words fail me

[Mr Levitator]

hawker750, have you considered, a route could have differing track on route legs which means differing ground speeds? Differing winds at flight levels (ground speed again) and temperatures (TAS this time - excuse the pun) during a climb or descent?

The current FMS's do a very good job on the RTA front. I particularly like not having to use a abacus after a 14hr flight to Australia for instance, where inevitably an RTA is issued mid descent.

[Broomstick Flier]

Dear hawker750,

Thanks for the very positive remark, exactly what I was hoping for

Just for the records Sir, I am quite new on the type and thus am exploring and trying to learn all possible tricks it is able to do, but it does not mean I will actually use them on a day to day basis, but the knowledge will exist in the case the need arises and I am on a lazy day not wanting to do sub-GCSE maths.

But worry not, fortunately my lazy days are quite apart and I am more than happy to fly manually most of the time below RVSM airspace, mental calculations are the norm and I even press the seasoned captains I fly with for useful advise and tricks of the trade to make me a better aviator, after all, this is what is written on my license.

Cheers

[Zeffy]

Broomstick --

No E190 experience, but have flown extensively the EPIC FMS.

As noted above, the RTA function does not exist, but if your flavor of FMS software include a "What If" selection, it is possible via trial and error to examine the effects of various cruise Mach settings on ETA at a specific waypoint/fix.

[Capn Bloggs]

No RTA? Has it got a Cost Index function? On our non-jungle jet machine, we just adjust the Cost Index to achieve a TOT (time at a waypoint); especially useful for waypoints in the descent, as the RTA function for descent waypoints is a WOFTAM.

[GAFA]

No CI on the 190. I just go Manual speed, adjust as required and then change the speeds in the Perf page and then back to FMS speeds.

[Broomstick Flier]

Indeed no CI on ours either. Perhaps some day when they decide to provide a decent performance package with the FMS.

Thanks for the tips anyway, will make some tests on my next flights.