(2)  
N1 Indicator (Ref 77-12-00/501)

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 (3)  
Distance Measuring Equipment (AMM 34-55-02/501)

 (4)  
Electronic Flight Instrumemtation System (EFIS)

 I. Control Display Unit (Fig. 501)
 (1)  
You use the CDU to do the FMCS BITE tests.

 (2)  
AIRPLANES WITH MORE THAN ONE CDU;
 You can do the FMCS BITE test with CDU No. 1 or CDU No. 2.

 (3)  
Twelve line-select keys (LSKs) are on the CDU front panel. There are six LSKs on each side of the display screen. The LSKs align with the third, fifth, seventh, ninth, eleventh and thirteenth lines on the display. You can write data into the CDU display on these lines.

 (4)  
When you write data into the CDU display, the data is shown on the CDU scratch pad.

 (5)  
The CDU scratch pad can also show FMCS failures and alert messages.

 (6)  
You use the CLR key on the CDU front panel to remove messages from the scratch pad.

 (7)  
To move data from the scratch pad to a display line, push the LSK adjacent to the display line.

 (8)  
You can make a copy of the data in a display line and put it in the scratch pad. Make sure the scratch pad is empty and then push the LSK adjacent to the display line. The scratch pad will show the same data as the display line. You can move the data from the scratch pad to a different display line.

 (9)  
You can make a selection and control the sequence of tests with the LSKs. A display line can have a caret (<) that points to a LSK. You make a selection of a display line when you push an LSK adjacent to a caret.

 (10)
 Two of the frequent display lines you can see on the CDU screen are CONTINUE> and <INDEX.

 (11)
 A selection of the CONTINUE> line shows the subsequent page of a test procedure on the CDU display.

 (12)
 A selection of the <INDEX line shows the index page on the CDU display. You use the index page to select tests or data.

 (13)
 You Push LSK 6L (<INDEX) to stop FMCS BITE and show the MAINT BITE page on the CDU display.

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MAINTENANCE MANUAL

PAGE NUMBER FIVE INCH CRT,
BLOCK

DATA STATUS BLOCK TITLE BLOCK FOURTEEN 24-CHARACTER
LINE SELECT KEYS
LINE SELECT KEYS (LSK) LEFT
(LSK) RIGHT

1L 1R
2L 2R
3L 3R
4L 4R
5L 5R
6L 6R
DATA BLOCK

INIT REF KEY
ANNUNCIATORS
REMOVAL/INSTALLATION HANDLE

Flight Management Computer System Control Display Unit
Figure 501

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 (14) You can also push the INIT/REF key on the CDU panel to stop FMCS BITE. The CDU display will show these two pages. If the IRS is in the NAV mode, the CDU will show the PERF INIT page. If the IRS is not in the NAV mode, the CDU will show the POS INIT page.
 TASK 34-62-01-715-001
 2.  Operational Test - FMCS_______________________
 A. General
 (1)  
You use the operational test to quickly examine the FMCS.

 (2)  
The operational test includes:

 (a)  
Annunciator Test

 (b)  
Navigation Data Base and Operational Program Verification
　
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