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% Maintenance Practices % 1. General
% These maintenance practices tell you how to remove/install the transponder and the blind altitude % encoder. They also tell you how to adjust/test the transponder and do fault analysis on the blind % encoder.
% 2. Remove/Install the Transponder
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% A. Remove the Transponder %

Detail Steps/Work Items  Key Items/References 
(1)  Open the transponder circuit-breaker. 
(2)  Put a 3/32 Allen wrench into the access hole for the locking screw. Engage the screw.  Refer to Figure 1 (KT 76A) or Figure 2 (KT 76C) or Figure 3 (GTX 327). 
(3)  Turn the screw counter-clockwise until the unit disengages from the mounting rack. 
CAUTION: DO NOT PULL ON THE KNOBS. DO NOT PRY THE FACE-PLATE. IF YOU PULL ON THE KNOBS, OR PRY THE FACE-PLATE, YOU CAN DAMAGE THE UNIT. CAUTION: DO NOT TOUCH THE CONNECTOR CARD AT THE REAR OF THE UNIT. THE ELECTROSTATIC CHARGE ON YOUR BODY CAN DAMAGE THE UNIT. 
(4)  Pull gently on the sides of the unit to remove it from the mounting rack. 
(5)  Install the protective covers on the rear connectors of the transponder. 

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% B. Install the Transponder %

Detail Steps/Work Items  Key Items/References 
(1)  Remove the protective covers from the connectors on the replacement unit. 
(2)  Slide the unit into the rack. Engage the locking screw so that the latch front-lobe touches the rack. 
(3)  Turn the locking screw clockwise so that the rear lobe engages the mounting rack.  Refer to Figure 1 (KT 76A) or Figure 2 (KT 76C) or Figure 3 (GTX 327). 
CAUTION: DO NOT OVER-TIGHTEN THE LOCKING SCREW. YOU CAN DAMAGE THE LOCKING MECHANISM. 
(4)  Continue to turn the screw until the unit is fully installed in the mounting rack. 
(5)  Close the transponder circuit-breaker. 
(6)  Do an operational test.  Refer to Paragraph 4. 

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% 3. Remove/Install the Blind Altitude Encoder
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% A. Remove the Blind Altitude Encoder %

Detail Steps/Work Items  Key Items/References 
(1)  Open the XPDR circuit breaker. 
(2)  Remove the instrument panel cover.  Refer to Section 25-10. 
(3)  Disconnect the static hose from the encoder.  Put a cap on the static hose! 
(4)  Disconnect the electrical connector(s). 
(5)  Release the knurled mounting screw for the encoder. 
(6)  Remove the encoder.  Remove the SAE5-35 from the mounting rack. 
(7)  Install a cover over the static port. 

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% B. Install the Blind Altitude Encoder % %

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Detail Steps/Work Items  Key Items/References 
(1)  Remove the cover from the static port on 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.  Slide the SAE5-35 in the mounting rack. 
　
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