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Copyright . The Boeing Company. See title page for details.
11.31.34 June 8, 2001
737 Operations Manual
FMC Databases
The FMC contains two databases:
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performance database
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navigation database.
The performance database eliminates the need for the flight crew to refer to a performance manual during flight, and provides the FMC with the information required to calculate pitch and thrust commands. All information normally required can be displayed on the CDU. The database includes:
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airplane drag and engine characteristics
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maximum and optimum altitudes
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maximum and minimum speeds.
Maintenance personnel can refine the database by entering correction factors for drag and fuel flow.
The navigation database includes most information normally determined by referring to navigation charts. This information can be displayed on the CDU or navigation display. The database contains:
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the location of VHF navigation aids
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waypoints
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airports
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runways
. other airline selected information, such as SIDs, STARs, approaches, and
company routes.
If the permanent database does not contain all of the required flight plan data, additional airports, navaids, and waypoints can be defined by the crew and stored in either a temporary or a supplemental navigation database. Use of these additional databases provides world–wide navigational capability, with the crew manually entering desired data into the FMC via various CDU pages. Information in the supplemental navigation database is stored indefinitely, requiring specific crew action for erasure; the temporary navigation database is automatically erased at flight completion.
The temporary and supplemental databases share storage capacity for forty navaids and six airports, the entries being stored in either database on a first come, first served basis. For the waypoint category, exclusive storage is reserved in the temporary database for twenty entries (including those created on the RTE or RTE LEGS pages). An additional twenty waypoints (up to a maximum of forty) can be stored in either the temporary or supplemental database on a first come, first served basis.
Flight Management, Navigation -Flight Management Computer
737 Operations Manual
When any storage capacity is full, entries which are no longer required should be deleted by the crew to make space for additional new entries. Created waypoints cannot be stored in the database runway category.
The FMC contains two sets of navigation data, each valid for 28 days. Each set corresponds to the normal navigation chart revision cycle. The FMC uses the active set for navigation calculations. The contents of the navigation database are periodically updated and are transferred to the FMC before the expiration date of the current data.
Thrust Management
The autothrottle operates in response to flight crew mode control panel inputs or to automatic FMC commands. Reference thrust can be selected on the N1 LIMIT page. Automatic FMC autothrottle commands are made while VNAV is engaged. The autothrottle system:
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uses reference thrust limits calculated by the FMC
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commands the thrust levers
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commands thrust equalization through the power management control. Thrust limits are expressed as N1 limits. The FMC calculates a reference thrust for the following modes:
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takeoff . reduced climb
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derated takeoff (U4 and on) .cruise
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assumed temperature takeoff . continuous
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climb . go–around.
The thrust reference mode automatically transitions for the respective phase of flight. These modes can be selected on the N1 LIMIT page. The selected thrust reference mode is displayed on the thrust mode display.
On airplanes with automatic thrust reduction, the flight crew can specify the thrust reduction height where the transition from takeoff to climb thrust takes place by making an entry on the N1 LIMIT page. This can be an altitude from 400 feet above the origin airport to 15,000 feet MSL. The default value is 1500 feet above the origin airport.
Reduced Thrust Takeoff
Reduced thrust takeoffs lower EGT and extend engine life. They are used whenever performance limits and noise abatement procedures permit.
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