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View Full Version : What happens when WAAS has a problem ?

Klauss
11th Nov 2022, 04:20
Hi, on the 7th of November, there was some trouble above, and the pictures of WAAS coverage showed what Iīd call a hole that pretty much covered Canada , north Canada, for a couple of hours. How is a WAAS trouble announced to pilots ? Maybe the electronics in the aircraft do it in real time, but how about planning a flight from A to B, which would normally have WAAS as a requirement for approaches or even departures ?

Thanks,

Klauss
Check Airman
11th Nov 2022, 07:01
A NOTAM of the WAAS outage should be published, if I recall correctly.
BizJetJock
11th Nov 2022, 10:06
WAAS - or more accurately SBAS, since it depends where you are in the world - is only required for LPV approaches. So for the majority of ops it doesn't matter anyway. It is certainly not required for any depature or arrival I know, nor LNAV or LNAV/VNAV approaches.
awair
11th Nov 2022, 11:43
OP, Could you please clarify?

Was this a loss of WAAS or a degradation?
Was this a confirmed outage, or a possibility?

Do you have the mentioned chart to share.

Many thanks.
Klauss
11th Nov 2022, 13:32
Hi,
donīt know how to call it - no idea about the definitioin.
I guess it was a loss of WAAS for northern Canada, around 21z, 07 Nov, and overall, a degradation. 17:00 - 21:40 z.
Semantics.

The FAA website with all the info you may like is here: https://www.nstb.tc.faa.gov/
The movie of the day is here: https://www.nstb.tc.faa.gov/nstb-archive//VIDEOS/W2235D1/LPV_ServiceArea_w2235d1.avi

So, any NOTAM ? Any impacts, like diversions ?

Thanks a lot,
Klauss


OP, Could you please clarify?

Was this a loss of WAAS or a degradation?
Was this a confirmed outage, or a possibility?

Do you have the mentioned chart to share.

Many thanks.
Klauss
12th Nov 2022, 20:13
Hi, from the movie in the link of my previous post, this picture:
https://cimg0.ibsrv.net/gimg/pprune.org-vbulletin/1556x1357/waas_snapshot_856b1d4a866a3641d1200cc3a3c7bc863fe00a99.jpg