– PITOT–STATIC SYSTEM / INSTRUMENTS
Document: SLSA-MIP-5-4-0-US
Date of Issue: 05/2016
Revision: -
12-6
12.4 Check / Adjustment
12.4.1
Check of pitot
–static system tightness
In the static pressure system create the under pressure by means of an appropriate
instrument corresponding to altitude of 1000 ft. Drop in the indicated altitude per one
minute must not exceed 100 ft.
In the system of total pressure create the overpressure corresponding to speed of 140
knots (260 km/h,161 mph) by means of a suitable instrument. Drop in speed during 3
minutes must not exceed 2.3 knots (4.4 km/h, 2.7 mph).
12.4.2
Magnetic compass compensation
12.4.2.1
Rules for doing compensation of the magnetic compass
Compass compensation must be performed on the approved compass bases, which
are at least 100 m (300 ft) from steel structures, electric leading or other over ground or
underground steel equipment or objects.
If the compass north is westward from magnetic north, the deviation is westward, i.e.
negative. If the compass north is eastward from magnetic north, the deviation is
eastward, i.e. positive.
12.4.2.2
Compensation procedure
Turn the airplane to "N" heading, eliminate the deviation by "C" screw.
Turn the airplane to "S" heading, reduce the found out deviation to the half
–value by "C"
screw and write down the rest of the deviation.
Turn the airplane to "E" heading, eliminate the deviation by "B" screw.
Turn the airplane to "W" heading, reduce the found out deviation to the half
–value by
"B" screw and write down the rest of the deviation.
Turn the airplane by grades indicated in the compensation report (seeTab. 12-1) and
write down individual deviations in the table.
After finishing compensation of the magnetic compass fill out the deviation card (see
Fig. 12-3) and place it near the magnetic compass in the airplane.
Fig. 12-3
Example of the deviation card
Summary of Contents for S-LSA
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