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A

737-300/400/500
MAINTENANCE MANUAL

CDU Display - Data Base Loading
Figure 203

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737-300/400/500MAINTENANCE MANUAL
 G. Download Failure Indication
 S 712-074
 (1)  If a failure occurs the CDU will show LOAD FAILURE and DATA LOAD INOP. The FAIL light on the PDL will also come on.
 NOTE: The FAIL light comes on when a failure is detected while in
____
 these modes:

 -turn on test,
 -self test,
 -upload transfer,
 -download transfer.

 S 712-075
 (2)  The CDU display will also show the failure indications as follows:
 (a)  
CHECK DBL OR INTERFACE - This shows the most probable cause of the failure.

 (b)  
NDB EXCEEDS FMC MEMORY - This shows that the navigation data base is too large for the FMC data base memory.

 (c)  
RESET COUNT EXCEEDED - This shows the PDL downloaded the navigation data base incorrectly five times.

 (d)  
CHECK MEDIA - This shows that a portion of data on the disk is not clear.

 H. New Navigation Data Base Verification
 S 712-078
 (1)  
Make sure the CDU display shows the IDENT 1/1 page.

 S 712-079

 (2)  
Make sure the CDU display shows the IDENT 1/2 page.

 S 712-081

 (3)  
Make sure that you have the correct part number for the navigation data base.

 S 712-082

 (4)  
Make sure the dates for the navigation data base directly below ACTIVE are current.

 I. Put The Airplane Back to Its Usual Condition
 S 862-087
 CAUTION: MAKE SURE THE POWER ON LIGHT ON THE PDL IS OFF AND POWER IS
_______ REMOVED FROM THE FMCS BEFORE YOU DISCONNECT THE INTERFACE CABLE. IF YOU DO NOT DO THIS DAMAGE TO THE EQUIPMENT MAY OCCUR.
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  On the 2nd OBS AND CIRCUIT BREAKER PANEL P18-2: 1) FMCS CDU No. 1
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A 737-300/400/500MAINTENANCE MANUAL
 2) 3) 4)  FMCS CDU No. 2FMC (or FMCS CMPTR)MODE ANN
 (2)  S 092-088Remove the interface cable from the FMCS DATA TRANSFER UNIT RECEPTACLE.
 (3)  S 092-089Remove the interface cable from the PDL.
 (4)  S 862-090Close these circuit breakers and attach DO-NOT-CLOSE tags: (a) On the 2nd OBS AND CIRCUIT BREAKER PANEL P18-2: 1) FMCS CDU No. 1 2) FMCS CDU No. 2 3) FMC (or FMCS CMPTR) 4) MODE ANN
 (5)  S 862-091Remove electrical power if it not necessary (Ref 24-22-00/201).

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737-300/400/500MAINTENANCE MANUAL
 FLIGHT MANAGEMENT COMPUTER SYSTEM - ADJUSTMENT/TEST
___________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task is an operational test of the Flight Management Control System (FMCS). The second task is a system test of the FMCS.
 B.  The FMCS built-in test (BITE) is used to make sure that the FMCS operates correctly. You use the Control Display Unit (CDU) to operate the FMCS BITE.
 C.  A failure in the FMCS is shown by these indicator lights and CDU screen displays:
　
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