AMM

Figure 4: Component Locations
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Trouble-Shooting
1. General
The table below lists the defects you could have with the flight environment data system. If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair given in the Repair column.
Trouble  Possible Cause  Repair 
Altimeter lags or reads incorrectly. VSI reads incorrectly.  Faulty indicator. Blocked or kinked static hose. Water in the system.  Replace the indicator. Clear the hose. Drain the water. 
Airspeed indicator reads low.  Faulty indicator. Blocked or kinked Pitot hose. Water in the system.  Replace the indicator. Clear the hose. Drain the water. 
Pitot heat does not operate.  Pitot Heat circuit-breaker open. Pitot Heat circuit-breaker defective. Pitot Heat wiring open-circuit Pitot probe defective.  Close the circuit-breaker. If the circuit-breaker opens again, do a test for a short -circuit in the Pitot Heat wiring. Replace the circuit-breaker. Do a continuity test of the wiring. Repair or replace defective wiring. Replace the Pitot probe. 
OAT indicator gives incorrect indication.  OAT circuit-breaker open or defective. Defective power supply cable.  Close the circuit-breaker. Or replace the circuit-breaker. Repair the cable. 

Doc # 6.02.01 Page 101
Rev. 4 09 Jan 2003

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Maintenance Practices
1. General
These maintenance practices tell you how to replace components of the environmental data system. It also tells you how to test the Pitot-static system. Refer to the equipment manufacturers' manuals for more data about the equipment.
2. Remove/Install a Pitot-Static Instrument
A. Remove a Pitot-Static Instrument
Detail Steps/Work Items  Key Items/References 
(1)  Remove the instrument panel cover.  Section 25-10. 
(2)  Disconnect the Pitot-static hose(s) from the rear of the instrument. 
(3)  Remove the screws which attach the instrument to the panel.  Hold the instrument! 
(4)  Remove the instrument from the panel. 

B. Install a Pitot-Static Instrument
Detail Steps/Work Items  Key Items/References 
(1)  Remove the port cover(s) from the new instrument and fit to the removed instrument. 
(2)  If necessary, transfer the Pitot-static fittings to the new instrument. 
(3)  Put the instrument in position in the panel. 
(4)  Install the screws which attach the instrument to the panel. 
(5)  Connect the Pitot-static hoses to the rear of the instrument. 
(6)  Do a low-range static leak check.  Paragraph 5. 
(7)  For the ASI only: S Do a Pitot-static leak check.  Paragraph 5. 
(8)  Install the instrument panel cover.  Section 25-10. 

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3. Remove/Install the Pitot-Static Probe
A. Remove the Pitot-Static Probe
Detail Steps/Work Items  Key Items/References 
(1)  Open the Pitot Heat circuit-breaker.  Lower left instrument panel. 
(2)  Remove the Pitot access panel from the lower surface of the wing.  Refer to Section 52-40. 
(3)  Move the probe down to give access to the connections. 
(4)  Disconnect the electrical connector. 
(5)  Disconnect the Pitot and static hose connections.  Identify the connections and put caps on the hoses. 
(6)  Disconnect the bonding cable. 
　
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