On Monday, May 28, 2012 12:13:57 PM UTC-7, Marc wrote:
On May 28, 11:59*am, uros wrote:
I have checked both flights and for the first flight it seems to me
that the flight recorder was turned on too late. Every GPS needs some
time to find correct position and when the GPS is moving this time is
even longer. The correct procedure is to turn on the GPS few minutes
before the flight so that GPS could correctly find first position and
will start recording correctly. These jumps could be easily detected
and the recording would be cut off.

Uros, if the GPS was engaged in cold/warm start and recording 2D or
degraded fixes, why wasn't the navigation warning flag set (V in
column 24 of the B records)?

Marc

And if the fixes were 2D why was the GPS altitude not recorded as zero. At least that's is a requirement of IGC flight recorders--I'll admit to being lost as to what actual hard specs the NACs are supposed to hold position recorder manufacturers too. I hope the SSA is looking at this.

Darryl