Andrew Gillanders a écrit : > I have a question about the HSI in the Piper Seneca. There is a > discrepancy between the magnetic compass and the HSI, equal to the > magnetic variation. So, the HSI seems to be displaying true heading. > However, everything I read about HSI's says that it should display > magnetic heading. Since the HSI is a gyro device, it needs to be > adjusted to agree with the magnetic compass prior to flight, but I > cannot find a way of doing that. > > Should the HSI be displaying magnetic or true heading? If magnetic, > how can it be adjusted to agree with the magnetic compass? > > Thanks > Andrew > > > ------------------------------------------------------------------------------ > Register Now & Save for Velocity, the Web Performance & Operations > Conference from O'Reilly Media. Velocity features a full day of > expert-led, hands-on workshops and two days of sessions from industry > leaders in dedicated Performance & Operations tracks. Use code vel09scf > and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf > _______________________________________________ > Flightgear-users mailing list > Flightgear-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-users > > > The Seneca HSI is different to other HSI because it can't be adjusted by hand. There are two modes: a mode where it can move freely (and it can show a wrong heading) and a slave mode, where it shows always the right heading. Maybe it shows the true heading instead of the magnetic heading? I don't know by which instrument it is adjusted, if it's the GPS then it must be the true heading...
Guillaume ------------------------------------------------------------------------------ Register Now & Save for Velocity, the Web Performance & Operations Conference from O'Reilly Media. Velocity features a full day of expert-led, hands-on workshops and two days of sessions from industry leaders in dedicated Performance & Operations tracks. Use code vel09scf and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf _______________________________________________ Flightgear-users mailing list Flightgear-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-users
