Timeline for Does the GPWS rely solely on the radio altimeter?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 12, 2022 at 17:28 | vote | accept | Pilot Collins | ||
| Apr 6, 2022 at 17:24 | vote | accept | Pilot Collins | ||
| Apr 6, 2022 at 17:25 | |||||
| Apr 5, 2022 at 3:58 | comment | added | Ralph J♦ | According to that linked article, the A-320 does pass the FMS position to the EGPWS. That incident illustrates the wisdom of keeping the position fixes separate! | |
| Apr 5, 2022 at 3:48 | comment | added | Ralph J♦ | @UnrecognizedFallingObject In the 737 NG, that's not correct. The EGPWS has its GPS receiver, and it never sees the FMS position. I've flown when GPS jamming was active, and while the FMS position was fine (from DME/DME updates - so a slightly larger ANP), the EGPWS Terrain display was missing & we had the Fail light for the EGPWS. Other aircraft may work differently. | |
| Apr 5, 2022 at 3:08 | comment | added | UnrecognizedFallingObject | In particular, it uses the computed position generated by the FMCs or other equivalent navigation gear -- EGPWS will still function on aircraft without GPS in their nav receivers, using INS/navaid positioning, but it's vulnerable to dodgy ground navaids in that circumstance | |
| Apr 4, 2022 at 16:07 | history | answered | Ralph J♦ | CC BY-SA 4.0 |