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by one pilot must be verified by the other pilot. In flight FMC CDU changes
should be made by the PM and executed only after confirmation by the PF.
FMC Route Verification Techniques
After entering the route into the FMC, the crew should verify that the entered route
is correct. There are several techniques that may be used to accomplish this. The
crew should always compare:
• the filed flight plan with the airways and waypoints entered on the
ROUTE pages
• the computer flight plan total distance and estimated fuel remaining with
the FMC-calculated distance to destination and the calculated fuel
remaining at destination on the PROGRESS page.
For longer flights and flights that are planned to transit oceanic airspace, the crew
should cross-check each leg on the LEGS page with the computer flight plan to
ensure that the waypoints, magnetic or true tracks, and distances between
waypoints match.
If there is a discrepancy noted in any of the above, correct the LEGS page to match
the filed flight plan legs. A cross check of the map display using the plan mode
may also assist in verification of the flight plan.
October 31, 2006
777/787 Flight Crew Training Manual
General Information
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 1.33
FMC Performance Predictions - Non-Normal Configuration
FMC performance predictions are based on the airplane being in a normal
configuration. These predictions include:
• climb and descent path predictions including top of climb and top of
descent
• ECON, LRC, holding, and engine out speeds
• altitude capability
• step climb points
• fuel remaining at waypoints and destination or alternate
• estimated time of arrival at waypoints and destination or alternate
• holding time available.
If operating in a non-normal configuration, such as gear down, flaps extended,
spoilers extended, gear doors open, etc., these performance predictions are
inaccurate. FMC predictions for the climb and descent path are not usable.
Do not use FMC fuel predictions. Cruise fuel predictions are based on a clean
configuration. Fuel consumption may be significantly higher than predicted in
other configurations.
Note: VNAV PTH operation for approaches is usable for non-normal
configurations.
An accurate estimated time of arrival is available if current speed or Mach is
entered into the VNAV cruise page. Estimates of fuel remaining at waypoints or
the destination may be computed by the crew based upon current fuel flow
indications, but should be updated frequently. Performance information for gear
down altitude capability and gear down cruise performance is available in the PI
chapter of the QRH.
Holding time available is accurate in the clean and flaps one configuration
provided the FMC holding speed is maintained.
RNP and RNAV Operations
This section describes the basic concepts of RNP and provides information on
RNAV operations by phase of flight to include terminal (SIDs and STARs),
en-route, and approach.
October 31, 2006
777/787 Flight Crew Training Manual
General Information
Copyright © The Boeing Company. See title page for details.
1.34 FCT 777/787 Preliminary (TM)
Basic RNP Concept
RNP has been developed through international cooperation as a means of
identifying the navigation performance required for a specified area, route,
airspace, procedure or operation. RNP supports use of RNAV systems that use
multi-sensor position updating methods such as the flight management computer
(FMC). This accuracy is specified in NM (e.g., RNP 0.3 means the performance
required is “within 0.3 NM”). RNP values are usually smaller for terminal area
procedures (SIDs, STARs, approach transitions, and approaches) than en-route
procedures. Small RNP values normally require navigation performance that is
more precise than current VOR/ADF navigation, allowing lower weather minima
for departures and/or approaches.
The FMC uses one of the following as the displayed RNP:
• default RNP - FMC default values are set by the FMC and are displayed if
no RNP is available from the navigation data base or one has not been
manually entered
• navigation Data Base RNP - RNP values (if available) are displayed
based on values associated with the procedure. These values may be
unique for certain segments or terminal procedures
• manually entered RNP - remains until changed or deleted.
The crew may need to make a manual RNP entry if the displayed RNP for the
route or procedure is incorrect. Setting an RNP smaller than what is specified for
　
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