"Ronnie" wrote in message
news
Greg,

From the Instrument Flying Handbook in the primary / supporting
method, the primary instrument is the one that provides a direct
indication of the parameter you are trying to control.

Therefore, compass would be considered the primary heading
instrument in partial panel for straight flight. If you are trying
to maintain a given heading, the compass is the primary instrument.

Right, but Greg asked about the primary instrument for bank, not heading.

--Gary

During a standard rate turn, you are trying to maintain the rate of
the turn. The turn coordiator or turn indicator becomes primary
during the turn.

From a practical point, the compass is difficult to interpret during
anything but straight and level flight. A ground track from a GPS
or Loran provides a good substitute for the DG during partial panel
situations. During partial panel, I tend to use the turn coordinator to
keep the wings level, ground track readout for heading info and timed
turns to make heading changes.

Ronnie



"Greg" wrote in message
ups.com...
In primary and supporting method of attitude instrument flying, which
do you consider the primary instrument for bank in the partial panel
situation (loss of both attitude indicator and heading indicator)?
Turn coordinator or magnetic compass?
thank you
Greg
greggordon.org/flying