buggaluggs
31st Dec 2008, 10:23
I was reading an incident report the other day involving a series of system failures, resulting in severe degradation of the pitot static system on a B744, the problems affected all three ADC’s and the standby ALT. Not a good day out! However after a few busy minutes, and some great work by the crew the aircraft was landed safely.
My question is this, does anyone, cockpit or engineer, know how to access the altitude computed by the GPS system on the B744? I flew the bus for a few years and it is available on that FMC, but not, as far as I have been able to find, on the Boeing. I have also tried, unsuccessfully to find it in the CMC/ACMS, large amounts of info are available if you know how to ask for it, SAT,TAT,TAS etc so I though GPS ALT may also be hiding in the system somewhere too?
Before anyone starts jumping up and down, I’m fully aware of the limitations on the accuracy of GPS computed ALT. However, given that it’s completely independent of the pitot/static system, it could provide useful info to keep you out of terrain/sea.
Anyone got any ideas?
Cheers Buggs
My question is this, does anyone, cockpit or engineer, know how to access the altitude computed by the GPS system on the B744? I flew the bus for a few years and it is available on that FMC, but not, as far as I have been able to find, on the Boeing. I have also tried, unsuccessfully to find it in the CMC/ACMS, large amounts of info are available if you know how to ask for it, SAT,TAT,TAS etc so I though GPS ALT may also be hiding in the system somewhere too?
Before anyone starts jumping up and down, I’m fully aware of the limitations on the accuracy of GPS computed ALT. However, given that it’s completely independent of the pitot/static system, it could provide useful info to keep you out of terrain/sea.
Anyone got any ideas?
Cheers Buggs