7. Operation_________
A. Functional Description
(1)
The CMCS displays its maintenance information on the CDU. The information is organized within a menu structure. Each menu and display page is described below.
(2)
CDU MENU (Fig. 6)
(a)
The CDU MENU provides access to the page displays of each system that uses the CDU for crew control and display interface.
(b)
The CDU MENU is accessed by pushing the MENU key on the CDU.
(3)
CMC MENU (Fig. 7)
(a) All CMC functions and data pages are accessible through the two pages of the CMC MENU. 1) The functions on the first page (present leg faults,
confidence tests, EICAS maintenance pages, and ground tests) are intended to support line maintenance and airplane turnaround.
2) The functions on the second page (existing faults, fault history, and other functions) are intended to support extended maintenance and troubleshooting.
(b)
The header of the menu shows which CMC is in control. If the header is CMC-L MENU, the left CMC is in control; if the header is CMC-R MENU, the right CMC is in control.
(c)
Access to the CMC MENU is inhibited when the inertial ground speed is greater than 50 knots.
(4) NOTES and HELP
(a) The NOTES and HELP functions are accessible from the CMC MENU as well as from many other menus and display pages. 1) The NOTES function can be used to record more data related
to LRU failures. The NOTES> prompt is shown on a display only if there is data in the airline data base for that display.
2) Selection of the HELP> prompt from a page will provide information on the use of that page.
(5) Page Numbers
(a)
The page number indication in the top right corner of each page shows the page number and the total number of pages. For example, the indication 2/3 is shown on the second of three pages. The NEXT PAGE and PREV PAGE keys are used to move from one page to a higher or lower numbered page.
(b)
There can be a maximum of five characters in the page indication. If the total number of pages is 100 or larger, the indication will be shown incorrectly on all pages after page 9. For example, if the total number of pages is 145, the indication on page 3 is shown correctly as 3/145; but the indication on page 52 is shown incorrectly as 52/14. To prevent errors, the total number of pages should be read from pages 1 through 9.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(6) Message Pages (Fig. 8)
(a)
Most of the fault data provided by the CMCS is shown on the message (MSG) pages. There are message pages for the present leg faults function, the existing faults function, the fault history function, and the test results pages. These pages provide essentially the same type of fault data except for the minor differences noted below and on Figure 8.
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