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• 835 feet is entered as 0835; displays as 840
• 1,500 feet is entered as 1500; displays as 1500
• 8,500 feet is entered as 8500; displays as 8500
• 9,994 feet is entered as 9994; displays as 9990
Five digit entries represent feet, rounded to the nearest ten feet. This form is used
when the altitude exceeds 9,994 feet.
Examples of five (XXXXX) digit entries with transition altitude = 4,000 feet:
• 50 feet is entered as 00050; displays as 50
• 835 feet is entered as 00835; displays as 840
• 1,500 feet is entered as 01500; displays as 1500
• 8,500 feet is entered as 08500; displays as FL085
• 9,995 feet is entered as 09995; displays as FL100
• 11,500 feet is entered as 11500; displays as FL115
• 25,000 feet is entered as 25000; displays as FL250
Negative altitude entries are allowed to -1000 feet.
Airspeed Entry
Airspeeds can be entered into the FMC as calibrated airspeed, CAS, or Mach
number, M. Calibrated airspeeds are entered as three digits (XXX) in knots. Mach
numbers are entered as one, two, or three digits following a decimal point.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Boeing Proprietary 11.31.35
Data Pairs
Many CDU pages display data in pairs separated by a slash “/.” Examples of these
pairs include wind direction/speed and waypoint airspeed/altitude constraints.
When entering both values in a pair, the slash is inserted between the values. When
it is possible to enter only one value of the pair, the slash may not be required.
When entering only the outboard value of a pair, the trailing or leading slash may
be entered, but is not required before transferring to the data line. When entering
the inboard value of a pair, the trailing or leading slash must be entered before
transferring to the data line. Omission of the required slash normally results in an
INVALID ENTRY message.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
11.31.36 Boeing Proprietary
Intentionally
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787 Flight Crew Operations Manual
Flight Management, Navigation Chapter 11
Flight Management Computer Section 32
Boeing Proprietary 11.32.1
11.32 Flight Management, Navigation-Flight Management Computer FMC Databases
The FMC contains three databases:
• performance
• navigation
• airline modifiable information (AMI).
The performance database supplies performance data to the flight crew. It supplies
the FMC with data to calculate pitch and thrust commands. All pertinent data can
be displayed on the CDU. The database includes:
• airplane drag and engine characteristics
• maximum and optimum altitudes
• maximum and minimum speeds.
The navigation database includes most data found on navigation charts. This data
can be displayed on the CDU or ND. The database contains:
• location of VHF navigation aids
• airports
• runways
• other airline selected data, such as SIDs, STARs, approaches, and
company routes
• transition altitudes.
The FMC contains two sets of navigation data, each valid for 28 days. Each set
corresponds to the usual navigation chart revision cycle. The FMC uses the active
data for navigation calculations. The contents of the navigation database are
periodically updated and transferred to the FMC before the expiration date of the
active data.
The AMI file contains airline specified data. If the FMC senses a conflict in an
AMI value after a new AMI data load, the CDU help window message CHECK
AIRLINE POLICY is displayed.
Thrust Management
The thrust management function operates the autothrottle in response to flight
crew mode control panel inputs or to FMC commands. Reference thrust limits can
be selected on the THRUST LIM page. FMC autothrottle commands are made
while VNAV is engaged. Thrust management:
• calculates reference thrust limits and thrust settings, or follows FMC
thrust settings
• commands thrust levers
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management Computer
11.32.2 Boeing Proprietary
• senses and transmits autothrottle failures
• commands thrust equalization through the engine electronic controls.
Thrust limits are expressed as TPR limits. Thrust equalization references TPR.
Thrust management calculates a reference thrust for the following thrust settings:
With VNAV active, the reference thrust limit changes for the phase of flight.
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