(c)  
AIRPLANES WITH YDM -122 AND SUBSEQUENT YDM DASH NUMBERS; the YDM display and other fault indicators not related to autoflight BITE can be checked and individual LRU self-tests run.

 (3)  
LRU faults detected by MCDP ground tests will remain in the MCDP even after the LRU is replaced. It is necessary to exit ground test to clear the faults from the MCDP.

 (4)  
Faults that occur prior to take-off or after landing will not be reported as flight faults. These faults will only be detected and reported by ground tests.

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757 MAINTENANCE MANUAL
 AUTOFLIGHT BITE - MAINTENANCE PRACTICES
_______________________________________
 1.  General_______
 A.  This maintenance practice tells how to use the Maintenance Control Display Panel (MCDP) to review stored flight faults, test, and trouble-shoot.
 B.  Ground tests can be done by the MCDP for the individual computers, the line replaceable units (LRUs) and interfaces. The tests are shown on the MCDP front panel. This procedure gives the operation of each test.
 C.  Procedures are given to energize the MCDP and do the self-test, to do a check for flight faults, and to do the ground tests.
 TASK 22-00-02-712-001
 2.  Energize the MCDP and Do the Self Test______________________________________
 A.  General
 (1)  
The MCDP is energized manually on the ground to read flight faults or do ground tests. The MCDP is energized when the MCDP ON/OFF switch is pushed.

 (2)  
When the MCDP is started, it does a sequence of self-tests. The FAIL light in the ON/OFF switch/light will come on when the MCDP is energized and remain on for five seconds. Also, the FLT FAULTS mode light and the GRD TEST mode light will come on. All segments of the the display will come on. When the FAIL light goes off, the MCDP is prepared for use. The FAIL light will stay on if there is a failure during self-test.

 (3)  
Fault indications related to self-test failures show after the self-test is completed. These messages are not kept in non-volatile memory.

 (4)  
The MCDP will go off if power is off for more than 200 milliseconds. The MCDP will stay on if power is off for less than 200 msec. Messages related to not having power are these:

 MCDP FAIL  The MCDP had an error when the power came back
 RESTART  on. Open and then close the MCDP circuit breakers to energize the MCDP.
 PWR FAIL RST  This indication will show if the power goes off
 IN PROGRESS  and the MCDP starts again during the ground test mode. The indication comes on for three seconds, then the ground test can be done.
 B.  Reference
 (1)  24-22-00/201, Electrical Power - Control
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 C. Access
 (1)  
Location Zones
 119 Main Equipment Center (Left)

 (2)  
Access Panels
 119BL Main Equipment Center

 D. Energize the MCDP and Do the Self Test
 S 862-002
 (1)  Make sure these circuit breakers on the overhead circuit breaker panel, P11, are closed:
 (a)  
11C30, LANDING GEAR POS SYS 1

 (b)  
GUN 001-050, 052-999;
 11S4, MAINT CONT DSPL

 (c)  
GUN 051;
 11S6, MAINT CONT DSPL

 (d)  
11S15, AIR/GND SYS 1

 (e)  
11S19, AIR/GND SYS 2

 (f)  
11S23, POS SYS 2

 S 862-003
 (2)  
Supply electrical power (Ref 24-22-00).

 S 862-004

 (3)  
Put the MCDP ON/OFF switch to the ON position.

 (a)  Make sure the FAIL light, the FLT FAULTS light, and the GRD TEST light come on and then go off.
　
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