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This is a known issue - and old issue. These jets cannot fly without GPS. When they (the military) knocked out GPS intentionally around China Lake NAS a few m
by dfsegoat 10y ago
This is a known issue - and old issue.
These jets cannot fly without GPS.
When they (the military) knocked out GPS intentionally around China Lake NAS a few months back (for testing aircraft in GPS denied environments) -- all Embraers were told to avoid the area:
THIS NOTAM APPLIES TO ALL AIRCRAFT RELYING ON GPS. ADDITIONALLY, DUE
TO GPS INTERFERENCE IMPACTS POTENTIALLY AFFECTING EMBRAER PHENOM
300 AIRCRAFT FLIGHT STABILITY CONTROLS, FAA RECOMMENDS EMB PHENOM
PILOTS AVOID THE ABOVE TESTING AREA AND CLOSELY MONITOR FLIGHT
CONTROL SYSTEMS DUE TO POTENTIAL LOSS OF GPS SIGNAL.
https://www.faasafety.gov/files/notices/2016/Jun/CHLK_16-08_GPS_Flight_Advisory.pdf https://www.faasafety.gov/files/notices/2016/Jun/CHLK_16-08_...
- MichaelGG 10y agoDo you have any links to the reasoning that would let this kind of system be allowed? It seems rather fragile - GPS can be messed with rather easily.
- dfsegoat 10y agoI have none -- I don't claim to know much more than that about Embraer (or any other type). I found it to be ridiculous as well. My interest was more to the weapons system testing itself.
- raverbashing 10y ago> These jets cannot fly without GPS. No need for FUD. Loss of Yaw Damper is not something that would endanger an aircraft
- dfsegoat 10y agotried to edit it. but why would they mention it so prominently in the NOTAM?
- raverbashing 10y agoI'd say because aviation is risk averse and if a condition will impact a certain type or model of aircraft it is not going to be omitted (the fact that it's a smaller aircraft might imply in having some certification differences as well)
- tjohns 10y agoBecause it's still unexpected behavior, and suddenly losing aircraft systems mid-flight is a concerning event for a pilot. Especially ones related to flight control. That doesn't mean the plane can't fly. But it does mean that the pilot is going to have to fly it differently to avoid dutch roll, possibly flying at a lower altitude. Keep in mind that this is aviation, which is very risk averse (by necessity). Even minor issues are treated as significant.
- janoc 10y agoBecause when this bug happens, the pilot is going to face a "christmas tree" of warning lights and cautions, most likely provoking an immediate PAN or Mayday and a possible diversion to the nearest suitable airport. Loss of attitude info is a serious business, in the worst case the pilot may be left to fly only "raw data" and using the backup "steam gauge" instruments, because the displays and automation will stop working. Such event is no cake on a big jet, even during daylight, perfect weather and with the crew perfectly current and capable to fly like that. Murphy will have it that it happens during night, in a storm and most crews today are trained to rely on the automation and rarely getting to hand fly, even less raw data, without any of the computers. The result will be another AF443 ...
- raverbashing 10y agoSee the other links around, there's a Garmin manual showing the failure modes regarding loss of GPS data (even some people saying loss of GPS only should not cause YD failure) And it's AF447