MD-11 Flight Crew Operations Manual
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FMS -
Controls and Displays
FMS.30.8
MCDU Data Entry
Data must be entered into the Scratchpad (SP) from left to right with the
alphanumeric keys. Usually, the display field or data field acts as an example
format that when followed will result in successful data entry. After SP entry and
confirmation of correct data, an LSK push will transfer data from the SP to the
data field.
The two FMCs of the dual system communicate with each other over a private
Intersystem Bus (ISB). Each FMC receives button pushes directly from the same
side MCDU and button pushes from the off-side MCDU. The master FMC
sequences button pushes in the order received, and transmits button push
messages via the ISB to the other FMC. Thus, both FMCs process the same data
simultaneously and will not start a new button push process until both have
confirmed completion of the last button push. In case of simultaneous button
pushes on the MCDU, the master FMC assumes that its own MCDU's button push
came first. This allows both pilots to operate simultaneously on the same or
different MCDU pages and to enter data on different pages or on different lines of
the same page, however, only one flight plan modification at a time will be
processed. Data entry notes are as follows:
Lateral Flight Path Revision (LAT REV) - Accomplished on the F-PLN page by
pushing the appropriate left LSK with the SP empty.
Vertical Flight Path Revision (VERT REV) - Accomplished on F-PLN page using
right LSKs.
Altitude/Flight Level Entry - Altitude related fields may be entered as either
altitude or flight level. Data will be taken as flight level if 2 or 3 digits are entered
without FL or if data are entered with prefix FL. Data will be taken as altitude if
4 or 5 digits are entered (500 feet must be entered as 0500).
Runway Waypoint Entry - A runway may be used as a waypoint and must be
typed as KORD27L where KORD is an ICAO airport, 27 is the runway, and the
last space is blank or L, R, or C. The waypoint will be named RW and inserted
into the MCDU data line. Example: RW27L.
RETURN TO > 6R - When pushed, usually returns the pilot to the previous or
annotated page.
BUTTON PUSH IGNORED - This MCDU message is displayed if an LSK is
pushed during or just after a predicted profile point data appears.
NOTE: Access to MCDU pages may take up to 10 seconds or more when
the FMC is performing other computations.
October 02, 2006
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