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MAINTENANCE MANUAL

 D. CMC
 (1)  
The central maintenance computer (CMC) interfaces the DME system using an ARINC 429 bus via an electrical connector located on the rear of the interogator. The CMC instructs the interrogator to self-test by sending the interrogator a n ARINC 429 data word to self-test. The results for the DME interrogator are then sent to the EIUs and onto the CMC in an encoded ARINC 429 data word. Other faults related to the DME system are monitored and stored for future reference. Results are then processed by the CMC and presented to flight deck displays and on the CDU as required. For a detailed description of the CMC, see reference AMM 45-10-00/001.

 (2)  
The CMC monitors and records the following failures in either the left (L) or right (R) DME systems as follows (NOTE: Interrogator and transceiver reference the same item):

 ~..................................................................... | MESSAGE |MESSAGE NO.(L) | MESSAGE NO.(R) | ....................................................................... | INTERROGATOR FAIL | 34904 | 34924 | ....................................................................... | INTERROGATOR NO TEST RESPONSE | 34903 | 34923 | ....................................................................... | INTERROGATOR ANTENNA FAIL | 34905 | 34925 | | (RESERVED FOR FUTURE APPLICATIONS) | | | ....................................................................... | CDU-L INTERROGATOR BUS FAIL | 34906 | -----| ....................................................................... | CDU-R INTERROGATOR BUS FAIL | -----| 34926 | ....................................................................... | INTERROGATOR EIU BUS FAIL | 34902 | 34922 | ....................................................................... | INTERROGATOR FMC-L BUS FAIL | 34432 | 34434 | ....................................................................... | INTERROGATOR FMC-R BUS FAIL | 34433 | 34435 | ....................................................................... | INTERROGATOR FAIL FMC-L | 34475 | 34477 | ....................................................................... | INTERROGATOR FAIL FMC-R | 34476 | 34478 | ....................................................................... | FMC INTERROGATOR BUS FAIL | 34907 | 34927 | ....................................................................... | INTERROGATOR IND PROGR PIN FAIL | 34908 | 34928 | ....................................................................... | CMC INTERROGATOR BUS FAIL | 34901 | 34921 | 2....................................…...............…................1
 E. Control
 (1)  
Provide electrical power (Ref 24-22-00/201).

 (2)  
Close the following circuit breakers located on the overhead panel circuit breaker panel P7:

 (a)  
7B08 NAV RADIO DME L

 (b)  
7B19 NAV RADIO DME R

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MAINTENANCE MANUAL

 (3) Ensure that the following systems are operational:
 (a)
Intergrated Display System (AMM 31-61-00/501).

 (b)
Flight Management Computer System (AMM 34-61-00/501).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 FAULT ISOLATION/MAINT MANUAL
DME SYSTEM
COMPONENT  FIG. SHT 102  QTY  ACCESS/AREA  REFERENCE AMM 
ANTENNA - LEFT DME, B83 -- 1  BOTTOM OF FUSELAGE, STA 690  34-55-02 
ANTENNA - RIGHT DME, B84 -- 1  BOTTOM OF FUSELAGE, STA 830  34-55-02 
CIRCUIT BREAKER - -- FLT COMPT, P7 
DME L, C765 1  7B08  * 
DME R, C763 1  7B19  * 
COMPUTER - (FIM 34-61-00/101) 
LEFT FLIGHT MANAGEMENT, M7442  1 
RIGHT FLIGHT MANAGEMENT, M7443 1 
　
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