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757 MAINTENANCE MANUAL
 S 864-023 CAUTION: CROSS CONNECTION POSSIBILITY WHEN WORKING WITH THIS COMPONENT.
_______ CLEARLY IDENTIFY CONNECTIONS UPON DISCONNECTION AND FUNCTION CHECK UPON RECONNECTION.
 (3)  Disconnect the electrical connectors.
 S 434-002

 (4) Apply protective covers to the electrical connectors.
 TASK 22-14-01-404-008

 3.  Install the Autoland Status Annunciator
_______________________________________
 A.  References
 (1)  
AMM 22-00-02/201, Autoflight BITE

 (2)  
AMM 24-22-00/201, Electrical Power - Control

 B.  Access
 (1)  Location Zone
 211/212 Flight Compartment

 C.  Install the Autoland Status Annunciator
 S 034-009

 (1)  Remove the protective covers from the electrical connectors.
 S 864-025 CAUTION: CROSS CONNECTION POSSIBILITY WNEN WORKING WITH THIS COMPONENT.
_______ POSITIVELY IDENTIFY CONNECTIONS PRIOR TO RECONNECTION.
 (2)  Connect the electrical connectors.
 S 424-011 CAUTION: CAREFULLY PUT THE ASA INTO THE PANEL TO PREVENT FORCE ON THE
_______ ELECTRICAL CABLES. DAMAGE TO THE ELECTRICAL CABLES COULD OCCUR.
 (3)  Put the ASA into the panel opening.
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 S 434-012
 (4)  Tighten the two screws, in the upper right and lower left corners, that attach the clamp to the ASA.
 D. Test the autoland status annunciator.
 S 864-013
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-014

 (2)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:

 (a)  
11A17, AUTOFLIGHT WARN

 (b)  
11E16, MODE CONT PNL LEFT

 (c)  
11E34, MODE CONT PNL RIGHT

 S 714-015
 (3)  
Make sure that the ASA lightplate comes on.

 S 714-016

 (4)  
Push the TEST 1 switch on the applicable ASA.

 (a)  
GUN 001-050, 052-999; make sure that the top display shows LAND 3 and the bottom display shows NO LAND 3.

 (b)  
GUN 051; make sure that the top display shows AUTOLND 3 and the bottom display stays blank.

 S 714-017
 (5)  Push the TEST 2 switch on the applicable ASA.
 (a)  
GUN 001-050, 052-999; make sure that the top display shows LAND 2 and the bottom display shows NO AUTOLND.

 (b)  
GUN 051; make sure that the top display shows AUTOLND 2 and the bottom display shows MANUAL LND.

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 (6)  S 714-018Do MCDP Ground Test 06-ASA (AMM 22-00-02/201). (a) Make sure that no failures occur during the test.
 (7)  S 864-019Remove electrical power if not necessary (AMM 24-22-00/201).

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 AUTOPILOT/FLIGHT DIRECTOR INTERCHANNEL DATA - DESCRIPTION AND OPERATION
_______________________________________________________________________
 1.  General_______
 A.  The three Flight Control Computers (FCCs) communicate with each other via interchannel digital data buses and analog discretes. There are two input and two output interchannel high speed ARINC 429 buses connected to each FCC. There are two input and one output discrete data lines for analog discretes. Sensor signals, engage, and autoland status are shared to allow signal voting, fault detection, and determination of proper annunciations based on the status of all FCCs.
　
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