S 865-097
(13)
Set the TEST SELECT switch on the ADC to the FUNCTION position.
NOTE: The VSI OFF flag will come into view when the DADC PUSH TO
____ TEST switch is pushed.
S 865-020
(14) Push and hold the PUSH TO TEST switch on the ADC.
(a)
Make sure the TEST VALID WHEN LIT light on the ADC comes on in approximately 30 seconds.
(b)
Make sure you see these values on the air data indicators and the EADI and EHSI (as applicable).
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737-300/400/500MAINTENANCE MANUAL
NOTE: The TAT/SAT/TAS indicator or EIS secondary display
____
receives input from the No. 1 ADC.
1) Altitude 10,000 |40 feet
2) Mach 0.785 |0.01
3) Airspeed 440 |2 knots
4) Total Air Temperature + 0.14 |2°C
5) AIRPLANES WITHOUT EIS;
Static Air Temperature - 29.4 |2°C 6) AIRPLANES WITHOUT EIS; True Airspeed 477.8 |6 knots
NOTE: To change the mode of the TAT/SAT/TAS indicator push
____ the button on the front of the indicator.
S 865-022
(15)
Set the TEST SELECT switch to the SLEW position.
S 865-023
(16)
Push and hold the PUSH TO TEST switch.
(a) Make sure the TEST VALID WHEN LIT light comes on.
S 865-024
(17)
Set the TEST SELECT switch to the FAIL WARN position.
S 865-025
(18)
Push and hold the PUSH TO TEST switch.
(a) Make sure the TEST VALID WHEN LIT light comes on and the air data warning flags are in view.
(19)
Remove electrical power if it is not necessary.
S 865-030
(20)
AIRPLANES WITHOUT EIS; Make sure the TAT/SAT/TAS indicator goes out of view in less than 5 seconds.
S 865-031
(21)
AIRPLANES WITH EIS; Make sure the TAT indication on the EIS secondary display goes out of view.
S 865-026
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TASK 34-12-01-735-086
3. Air Data System - System Test
_____________________________
A. General
(1) The air data system test does a check of the operation and precision of the air data system (ADS). The air data system includes the air data computers (ADC), the air data instruments, and the standby pneumatic altimeter/airspeed indicator.
B. Equipment
(1)
Stopwatch
(2)
Decade resistance box
(3)
Air data test set, Druck ADTS405F, DRUCK Ltd. (Vendor Code 0R667), Leicester, England; or equivalent
(4)
Pitot-static probe adapter kit, P/N AD-953-7, Nav-Aids Ltd., Montreal, Canada; or equivalent
(5)
Static port test adapter assembly, P/N F72823-40, or equivalent
(6)
Flow restrictors, control valves, cutoff valves, and pressure tape as necessary
C. References
(1)
AMM 24-22-00/201, Electrical Power - Control
(2)
AMM 34-11-01/501, Pitot-Static System
D. Access
(1) Location Zones
211/212 Flight Compartment
E. Prepare for System Test
S 215-048
(1) Examine each pitot-static probe before and after this test for damage to the circular leading edge of its barrel.
S 865-049
CAUTION: OBEY THESE PRECAUTIONS BEFORE YOU APPLY PRESSURE TO THE PITOT
_______ STATIC SYSTEM. IF YOU DO NOT OBEY THESE PRECAUTIONS, DAMAGE TO THE EQUIPMENT AND INSTRUMENTS CAN OCCUR.
(2) Obey these precautions before you apply pressure to the pitot-static system.
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