B. Install the Pitot-Static Probe
Detail Steps/Work Items Key Items/References
(1) Put the Pitot probe in position on the wing.
(2) Install the attaching screws and connect the bonding cable.
(3) Connect the Pitot and static hoses. Remove the caps from the hoses. Make sure that you connect the hoses to the correct locations.
(4) Connect the electrical connector.
(5) Do a test of the Pitot Heat system.
(6) Do a low-range static leak test, Paragraph 5.
(7) Do a Pitot-static leak test. Paragraph 5.
(8) Install a cap with a red pennant on the Pitot-static probe.
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4. Remove/Install the OAT Indicator % A. Remove the Davtron 301F (C) OAT Indicator
Detail Steps/Work Items Key Items/References
(1) Open the circuit-breaker for the OAT.
(2) Remove the instrument panel cover. Section 25-10.
(3) Remove the nut which attaches the OAT sensor to the fuselage.
(4) Remove the temperature sensor cable from the cable harness and disconnect the electrical cable for the power supply.
(5) Remove the OAT indicator and sensor from the airplane.
% B. Install the Davtron 301F (C) OAT Indicator
Detail Steps/Work Items Key Items/References
(1) Put OAT indicator in position in instrument panel.
(2) Connect electrical connector for power supply.
(3) Put temperature sensor in position in fuselage and install nut which holds sensor in position.
(4) Use cable-ties to hold temperature sensor cable in position in wiring harness.
(5) Close OAT circuit-breaker.
(6) Set ALT/BAT switch to ON. The OAT indicator must indicate the ambient temperature ±1 °C or ±2 °F.
(7) Set ALT/BAT switch to OFF.
(8) Install instrument panel cover. Section 25-10.
% C. Remove/Install the Davtron M803 Digital Chronometer with OAT Indication % Refer to Section 31-20.
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5. Pitot and Static System Leak Tests
Always do a Pitot leak-test after you do maintenance on the Pitot system. And always do a low-range static leak-test after you do maintenance on the static system.
CAUTION: OBEY THE FOLLOWING PRECAUTIONS WHEN YOU DO A PITOT OR STATIC LEAK-TEST. IF YOU DO NOT OBEY THE PRECAUTIONS YOU DAMAGE THE AIR DATA INSTRUMENTS.
A. Test Precautions
) The pressure in the Pitot system must always be equal to (or greater than) the pressure in the static system. ) Reversal of the Pitot and static pipes can cause damage to the air data instruments. ) The applied pressure (and rate of change of pressure) must not be greater than the design limits of the equipment which you will test. ) After doing the test, you must always return the system to its usual operating conditions.
B. Equipment
Item Quantity Part Number
Pitot-Static probe adaptor. 1 65797-07
Pitot-Static leak tester. 1 Commercial.
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C. Low Range Static Leak Test
Follow the test equipment manufacturer's instructions for the use of the test-set. Obey the safety precautions for Pitot-static leak-testing at all times!
Detail Steps/Work Items Key Items/References
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