GPS Primary lost
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A320 ‘GPS PRIMARY LOST’
Does ‘GPS PRIMARY LOST’ message means that RAIM check is failed?
thanks in advance
GPS PRIMARY is lost. This message is generated when:
— GPS/INERTIAL mode is lost, or
— Accuracy is downgraded from HIGH to LOW
while GPS confidence level was GPS
PRIMARY, or
— Accuracy is high and NAV mode is not
GPS/INERTIAL with GPS option active at
transition to Approach flight area.
This message is only displayed when GPS option is active. It is deleted if GPS PRIMARY is triggered.No, RAIM is a different kettle of water.
A ‘GPS PRIMARY LOST’ message simply indicates that the GPS signal from one or both MMR(s) has been lost. You could get this through something as simple as placing a small sheet of steel over the antenna, having a wire come loose, or anything else that restricts the signal from reaching the receiver.
RAIM detects faults with redundant GPS pseudorange measurements. That is, when more satellites are available than needed to produce a position fix, the extra pseudoranges should all be consistent with the computed position.
This is obviously the short story. If you need more details, let me know.
When you say RAIM check, that is an internal function of the system. For the system to determine horizontal and vertical position, at least 4 sats are needed.
To provide error detection in those measurements, at least 5 are needed.
To be able to detect, error detect, and isolate an error, at least 6 are needed.The RAIM system will look at all of the avail data, and compare the required level of accuracy (ex 0.15 RNP) with the actual accuracy level of the system.
For GPS PRIMARY.
ESTIMATED is the measure of position accuracy.
If ESTIMATED value exceeds the REQUIRED value, NAV ACCUR DOWNGRAD is displayed.
FM position is reliable but not sufficient to continue.GPS PRIMARY and HIGH accuracy must be present on BOTH MCDU PROG pages.
If GPS PRIMARY is lost, ESTIMATED position will increase with time.
FM position is reliable but not sufficient to continue.Gps primary lost aerosoft a320 что делать
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And how does that even happen?
Also its not long before i get an annoying BBBRRRRRRRRRRRRRRRRRRRRR sound thats driving me nuts.
Not to mention once i go below roughly 90% throttle the engine power seems to drop drastically all of a sudden.
[BUG] [MCDU] «GPS PRIMARY» is always displayed and I cannot enter it. #1862
The MCDU display always shows «GPS PRIMARY» or «GPS PRIMARY LOST».
When I type it, I hear a key click, but the value is not displayed and is not reflected.
To Reproduce
It is generated from the initial state.
Expected behavior
Actual behavior
Before the GPS alignment is completed, «GPS PRIMARY LOST» is displayed.
When the alignment is complete, the display changes to «GPS PRIMARY»
The screen changes according to each mode, but the «GPS **» part does not change.References
Additional context
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