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1. INTENDED USE
A. The BARFIELD INC. SC063 Sight Compass (P/N 101-01200) is a modified version of a
standby Aircraft Compass that had its compensating assembly removed and collimator sight
attached (refer to Figure 4). It can be used for determining the magnetic suitability of a Compass
swinging area, checking and laying out Compass swinging bases, and determining the magnetic
heading of an aircraft.
Note: Since the Sight Compass is used extensively when a prepared base is not available,
operating personnel should be familiar with its three uses and method of checking its
accuracy.
B. Modified features include:
1. Reversed magnetic polarity, which permit the operator of the Sight Compass to view the
aircraft being checked from the front. This makes communications (hand signals) between
the aircraft occupant and the Sight Compass operator convenient.
2. Attached to the front of the Sight Compass is a combination magnifying lens (to increase the
readability of the dial) and a collimating lens (to ensure precise sighting alignment).
3. Attached to the rear of the Compass is an adjustable Sight Lens. The lens is precisely
aligned to ensure that the overall accuracy of the dial falls within ± 1°.
4. The Compass is mounted on a bracket, which can be attached to a monopod assembly
(supplied with the Sight Compass).
5. The Sight Compass is painted orange and has a caution label attached to it to prevent
inadvertent installation in an aircraft.
6. The SC063 Sight Compass is packaged in a protective carrying case.
56-101-01200 Revision G
CHAPTER 1: GENERAL
Figure 4 Sight Compass
Page 5
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