Game Composites GB1 GameBird, Maintenance Manual

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Maintenance Manual GB1 GameBird
Page date: April 24, 2020
31-10
Magnetic Heading Indicator
Type Sirs Navigator, unlit
Manufacturer: Sirs Navigation Ltd.
Compass House, Bowes Estate
Wrotham Road, Meopham, Kent, DA13 0QB, UK
www.sirs.co.uk
Tool required: Sirs Corrector Key
Compensation Procedure:
This can be conducted either in the three point- or the flight attitude.
Before your compass can be adjusted the aircraft must be capable of being aligned to both the East /West axis
and North/South axis.
The use of another compass outside the aircraft, or a GPS to determine the cardinal points is advised.
Correction East / West (B Coefficient)
1. Align the aircraft facing East, insert the Corrector Key provided, into the left-hand hole at the front of
the compass, rotate the key in either direction so that the East point is directly under the Index line.
2. Align the aircraft facing West and check that the West Point is under the Index line.
Any error may be corrected by readjusting to remove HALF the error shown.
Correction North / South (C Coefficient)
1. Align the aircraft facing North, insert the Corrector Key into the right-hand hole at the front of the
compass, rotate the key in either direction so that the North point is directly under the Index line.
2. Align the aircraft facing South and check that the South point is under the Index Line.
Any error may be corrected by readjusting to remove HALF the error shown.
Repeat this procedure until the errors are minimized.
Record deviations in a deviation table, which has to be attached to the canopy frame: