Compass cards
Join Date: Oct 1999
Location: UK
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Compass deviation cards should be available for all of the compass systems on an aircraft, having been compiled from the compass swing data. However, a decent, remote reading compass should have deviatios of no more than plus or minus 1° and so applying deviation to planned headings is a bit irrelevant.
The puddle-jumpers (PA34, PA44 etc) I fly have cards for both compasses.
The puddle-jumpers (PA34, PA44 etc) I fly have cards for both compasses.
Join Date: Feb 2002
Location: The Sandpit
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Almost correct Stan,
Newer generation a/c with IRS's require a deviation card for only the stby compass as the IRS's have a 'map' of terrestrial variation in NVM which is used for magnetic heading and do not use flux valves and are therefore not subject any magnetic effects caused by the airframe.
I seem to recall figures of 3 or 5 years depending on the AMS for repeat compass swings.
Newer generation a/c with IRS's require a deviation card for only the stby compass as the IRS's have a 'map' of terrestrial variation in NVM which is used for magnetic heading and do not use flux valves and are therefore not subject any magnetic effects caused by the airframe.
I seem to recall figures of 3 or 5 years depending on the AMS for repeat compass swings.
