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AIRCRAFT
DV 20 KATANA AMM
Navigation and Pitot Static
Doc # 4.02.02
Rev. 13
34-10-00
Page 3
15 Dec 2018
C. Altimeter
The altimeter measures the change in atmospheric pressure using aneroid chambers. The changes
in pressure correspond to changes in altitude. A special mechanism converts the movement of the
aneroid chambers into deflections of the pointers. The altimeter is equipped with a scale calibrated
in feet (ft). Three pointers indicate the current altitude. The longest pointer shows 10,000 feet per
revolution, the intermediate pointer shows 100 feet per revolution, and the short pointer makes one
revolution for every 1,000 feet. The barometric scale shows hectopascals (same as millibars) and
may be adjusted using the adjustment knob in the lower left corner.
Indicator range
: -1,000 to 35,000 ft.
Temperature range
: -30°C to +50°C (-22°F to +122°F)
D. Airspeed Indicator
The airspeed indicator shows the velocity of the airplane relative to the surrounding air.
The operation of the airspeed indicator is based on the measurement of the difference between
total head and static pressure. Both pressures are picked up by the Pitot head and fed to the
airspeed indicator through hoses.
The measuring equipment of the airspeed indicator is an open membrane chamber. The total head
acts on the inside, while the static pressure acts on the outside. The differential pressure increases
with increasing airspeed. This results in a deformation of the membrane which is transferred to the
indicator needle via levers and gears. The airspeed is indicated in knots and km/h.
Information regarding the range markings is presented in the Flight Manual.
Altitude range
: -1,000 to 40,000 ft.
Temperature range
: -30°C to +70°C (-22°F to +158°F)
Summary of Contents for DV 20 KATANA
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