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A 737-300/400/500MAINTENANCE MANUAL
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DADC 1 TAT/SAT/TAS INDICATOR
YAW DAMPER COUPLER
AIRPLANES WITH AIR DATA VSION SOME AIRPLANES; THE ALTITUDE POT FORCABIN PRESSURE IS CONNECTED TO DADC 2
Air Data System No. 1 Block Diagram
Figure 2
A 737-300/400/500MAINTENANCE MANUAL
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PITOT
ALTITUDE
PRESSURE
REPORTINGON
ATC CONTROL PNL
STATICPRESSURE DIGITIZEDALTITUDE
ATC 1
DIGITIZEDALTITUDE
TEMP
TAT PROBE ATC 2
DADC 2
AIRPLANES WITH AIR DATA VSI
ON SOME AIRPLANES; THE ALTITUDE POT FORCABIN PRESSURE IS CONNECTED TO DADC 2
Air Data System No. 2 Block DiagramFigure 3
A 737-300/400/500MAINTENANCE MANUAL
3. AIRPLANES WITH AIR DATA VSI'S; Vertical Speed Indicator (Fig. 1 and 4)
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A. Vertical speed or rate of climb indicators are provided for the pilots. These indicators are operated by altitude rate signals from the air data computers. The rate of change of altitude is indicated by a radial pointer in thousands of feet per minute. Incorporated in the instrument is a power supply, reference voltage supply, a demodulator, amplifier and motor differential mechanism to provide readings of vertical speed. A failure monitor will show an OFF flag in the event of electrical power loss, loss of flag power from ADC, loss of input signal and internal malfunction.
4. Electric Altimeter (Fig. 1 and 4)
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A. Electric altimeters are provided for the pilots. Each altimeter is an electric drum-pointer type that recieves altitude information from the air data computer. The altitude is displayed in 1000-foot, 100-foot, and 20-foot increments on counters and in 100-foot and 20-foot increments by a pointer which reads against a fixed scale. The range of the altimeter if from -1000 to 50,000 feet with altitudes below sea level displayed by the rotating pointer and a NEG flag covering the counter. A warning flag will cover the counter drums in the event of a failure. The failure monitor will show the flag in the event of the following: loss of electrical power to the indicator, loss of flag signal from the DADC, excessive servo null voltage, loss of input synchro signal and internal indicator malfunction. A barometric pressure setting knob is provided to adjust the pressure setting which is displayed in both millibars and inches of mercury (Fig. 1).
B. The altimeters provide a barometric corrected resolver altitude signal to the DADC's.
5. Standby Airspeed/Altimeter Indicator
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A. The standby airspeed/altimeter indicator is a combination of two flight instruments which presents an integrated display of indicated airspeed and altitude (Ref Fig. 1).
B. The standby pneumatic airspeed indicator gives indicated airspeed 60 to 450 knots. A diaphragm within the instrument case is actuated by differential pressure from the airplane pitot static system. The diaphragm expands or contracts in proportion to the difference between the pressure around it and the pressure in it. The information is transferred from the diaphragm to the drum counter through mechanical linkage. The pointer shows indicated airspeed on a drum graduated in knots.
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737-300/400/500MAINTENANCE MANUAL
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