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available).
Locate with mounting screws. Follow the
adhesive manufacturer’s instructions.
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Rev. 8
Pitot-Static Probe Install Continued
Detail Steps/Work Items Key Items
(8) Install the access cover.
(9) Close the Pitot Heat circuit breaker.
(10) Do a test of the Pitot Heat.
(11) Do a pitot-static leak test. Paragraph 10
(12) Put a cap on the pitot-static probe.
C. Pitot Static Heat System
The ‘Pitot Heat’ system consists of heating elements embedded in the Pitot-Static Probe, a 15
amp circuit breaker, a control relay, thermal limit switches (HIGH and LOW), OFF/ON switch,
and a GREEN LED monitor. The control relay closes and supplies electrical current to the Pitot-
Static Probe heaters when the PITOT SWITCH is set to ON and the LOW and HIGH thermal
limit switches are CLOSED. A current monitoring sensor confirms this by activating the GREEN
LED monitor light. The LOW thermal limit switch with automatic reset will cycle the control relay
if the system is ON and the probe temperature is over approximately 50 degrees Celsius. If the
LOW temperature limit switch activates it will inhibit Pitot-Static Probe heater operation and the
GREEN LED monitor will go OFF until the Pitot-Static Probe temperature drops below
approximately 38 degrees Celsius. In the event that the LOW thermal switch with automatic
reset fails the HIGH thermal switch will open, current to the heating elements will stop and the
current monitoring light will go OFF. The HIGH thermal switch must be reset manually. The
reset button is located on the inboard face of the switch.
D. Pitot Static Heat System Functional Check
Perform the pitot static heat functional check as follows;
Detail Steps/Work Items Key Items
(1) Remove pitot -static probe cap.
(2) Insert a thermocouple probe between the
pitot static probe seal and the wing outer
painted surface.
(3) Switch BAT side of master switch to ON. Ensure that propeller area is clear.
(4) Switch Pitot Heat to ON. Green monitoring light should go ON.
(5) Monitor thermocouple probe temperature. As per Paragraph 7.C.
(6) Ensure that the monitoring light goes OFF
prior to the thermocouple probe temperature
exceeding 55 degrees Celsius.
This will take less than 5 minutes
depending on the air temperature.
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24 Oct 2001
Pitot Static Heat System Functional Check Continued
Detail Steps/Work Items Key Items
(7) Ensure that the monitoring light goes ON
prior to the thermocouple probe temperature
falling below 30 degrees Celsius.
This may take up to 15 minutes depending
on the air temperature.
(8) Switch Pitot Heat to OFF. Green monitoring light should go OFF.
(9) Switch BAT side of master switch to OFF.
(10) Remove thermocouple probe.
(11) Put a cap on the pitot-static probe. Wait for probe to cool completely prior to
covering probe.
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5. Remove/Install the Blind Altitude Encoder
Equipment
Item Quantity Reference
Transponder test set. 1 Commercial
Pitot-static probe adaptor 1 Commercial
Pitot-static leak-tester 1 Commercial
A. Remove the Blind Altitude Encoder
Detail Steps/Work Items Key Items
(1) Open the ATC circuit-breaker.
(2) Remove the instrument panel cover Refer to Chapter 25-10
(3) Disconnect the static hose from the encoder. Put a cap on the static hose.
(4) Disconnect the electrical connector.
(5) Release the knurled mounting screw for the
encoder.
(6) Remove the encoder.
(7) Install a port cover on the static port.
B. Install the Blind Altitude Encoder
Detail Steps/Work Items Key Items
(1) Remove the port cover from the encoder.
(2) If you install a new encoder, install the static
fitting from the old encoder on the new
encoder.
(3) Put the encoder in position on the mounting.
Install the knurled mounting screw.
(4) Connect the electrical connector.
(5) Connect the static hose to the encoder.
(6) Close the ATC circuit-breaker.
(7) Do a low-range static leak test. Refer to Paragraph 10
(8) Do the adjustment/test procedure. Refer to the paragraph that follows.
(9) Install the instrument panel cover. Refer to Chapter 25-10
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