PPOS on the IRMP
Thread Starter
Joined: Oct 2000
Posts: 461
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From: Bristol
PPOS on the IRMP
Taking the IRS as fitted to the 737-800 as a reference, if you set PPOS on aligment on the IRS Mode Panel,then go to NAV, does PPOS then freeze or does it continue to record the IRS calculated Lat and Long as you fly?
Dick
Dick
Per Ardua ad Astraeus
Joined: Mar 2000
Posts: 18,575
Likes: 4
From: UK
Not sure I understand, Dick? PPOS selects 'Present Position' for display so, yes, it is 'frozen' during (10 minute) alignment but moves with you in nav. Is that what you are asking?
Joined: Oct 2000
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From: Somewhere on a dodgy name badge
As BOAC says, we set PPOS into the FMC from GPS L, which transfers it to the IRSs for alignment: after the 10 minute alignment it switches to NAV ( we just switch them both straight to NAV on start up) it starts to compute position.
Thread Starter
Joined: Oct 2000
Posts: 461
Likes: 0
From: Bristol
Perhaps I should have said "remains frozen", but the question looked clear enough. This comes from a question and answer which implied that the PPOS readout did in fact remain frozen. I don't have the direct experience to arbitrate so I ask real operators - who have confirmed my understanding -thank you
Dick
Dick
