% G. GPS Antennas
% The DA 40 can be equipped with the following GPS antennas:
%) Bendix/King KA 92.
%) Garmin GA 56 (one or two).
% They are located on the top surface of the fuselage, behind the aft edge of the canopy frame.

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% Trouble-Shooting % 1. General
% The table below lists the defects you could have with the GPS and the GPS annunciation control unit. % 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.
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Trouble  Possible Cause  Repair 
Error message on GPS receiver.  Internal error.  Refer to GPS manufacturer's documentation. 
GPS does not operate.  GPS circuit-breaker not set. Faulty GPS receiver. Faulty cables/connectors.  Set the GPS circuit-breaker. Repair or replace the GPS receiver. Do a test for continuity on each cable. Do a test for short circuit to ground and between cables. Replace defective cables. 
GPS unable to acquire satellites.  Faulty GPS receiver. Faulty GPS antenna. Faulty connection between GPS antenna and GPS receiver.  Repair or replace the GPS receiver. Do a test for correct impedance of the antenna. If necessary, repair or replace the antenna. Ensure proper cable connections. Do a test for correct impedance of the antenna co-axial cable. Do a test for continuity on each cable. Do a test for short circuit to ground and between cables. Replace defective cables. 
GPS annunciation control unit does not operate.  Faulty GPS annunciation control unit. Faulty cables/connectors.  Repair or replace the GPS annunciation control unit. Do a test for continuity on each cable. Do a test for short circuit to ground and between cables. Replace defective cables. 

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DA 40 Series

Trouble  Possible Cause  Repair 
No correct GPS information on HSI.  GPS annunciation control unit switched to NAV. Faulty GPS annunciation control unit. Faulty HSI. Faulty cables/connectors.  Switch GPS annunciation control unit to GPS. Repair or replace the GPS annunciation control unit. Repair or replace the HSI. Do a test for continuity on each cable. Do a test for short circuit to ground and between cables. Replace defective cables. 
No correct NAV information on HSI.  GPS annunciation control unit switched to GPS. Faulty GPS annunciation control unit. Faulty HSI. Faulty cables/connectors.  Switch GPS annunciation control unit to NAV. Repair or replace the GPS annunciation control unit. Repair or replace the HSI. Do a test for continuity on each cable. Do a test for short circuit to ground and between cables. Replace defective cables. 

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% Maintenance Practices % 1. General
% This Section tells you how to remove/install the items of the GPS equipment.
% 2. Remove/Install the GPS Receiver
% A. Remove the GPS Receiver % %

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Detail Steps/Work Items  Key Items/References 
(1)  Open the related circuit-breaker(s).  GPS circuit breaker for KLN 89B, KLN 94, and MFD 150. COM and NAV/GPS circuit breakers for Garmin GNS 430/530. 
　
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