(d)
If the airplane does not have an aspirated temperature probe, outside air temperature (OAT) must be manually entered.
(e)
The FMCS provides takeoff thrust targets for full-rated takeoffs, and reduced thrust takeoffs. For reduced thrust takeoffs, an assumed temperature higher than the current OAT must be entered into the CDU. The assumed temperature is entered into the SEL TEMP data line on the TAKEOFF REF page.
NOTE:____Do not change the TAKEOFF REF page. If you made changes, remove the changes. Make sure there are no fixed derates selected. Make sure the SEL TEMP field on pages 1/2 and 2/2 is empty. Changes to the TAKEOFF REF pages can cause a lower thrust at takeoff than the flight crew is planning for.
(f)
The calculated takeoff speeds for V1, VR and V2 may be entered for ready reference.
(g)
The takeoff flap setting may also be entered. The default value of 1 is displayed until changed by the operator. Valid entries are 1, 5 or 15, all other entries are rejected.
(h)
The memo block, at the bottom of this page, displays any preflight items not completed for a normal FMCS preflight. When all preflight activity is complete the word STATUS is replaced with COMPLETE.
Departure Initialization
(a)
The departures pages can be accessed from the TAKEOFF REF page, or by pressing DEP/ARR key on CDU and then line selecting DEP on DEP/ARR INDEX.
(b)
The DEPARTURES pages provide a list of departure procedures related to the selected airport.
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(c) When the page is selected, a complete alphabetic list of SIDS contained in the data base (for the airport indicated in the title) are displayed. The SEL or ACT labels indicate the presence of an existing SID in the corresponding route.
(8)
Verify Initialization
(a)
Press INIT REF key.
(b)
Line select TAKEOFF (3L) on INIT/REF INDEX page.
(c)
Verify PRE-FLT COMPLETE is displayed on TAKEOFF REF page. If the preflight is not complete, PRE FLT STATUS will appear on the CDU screen display. The prompts on the screen will indicate what procedure must be performed to complete the preflight procedure.
(9)
Shut Down
(a)
Position IRS mode selectors to OFF.
(b)
Open all FMCS circuit breakers.
(c)
Remove cooling air.
(d)
If no longer required, remove external electrical power.
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737-300/400/500MAINTENANCE MANUAL
FLIGHT MANAGEMENT COMPUTER SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________________
1. General (Fig. 1)_______
A. The Flight Management Computer System (FMCS) is one of five major subsystems of the Flight Management System (FMS). The other four major subsystems are: the Digital Flight Control System (DFCS), the auto-throttle System (A/T), the Inertial Reference System (IRS) and the Electronic Flight Instrument System (EFIS).
B. The FMCS provides the functions of navigation, lateral guidance (LNAV), vertical guidance (VNAV), flight planning, and airplane performance optimisation. These functions assist the pilot with the flight management and control of the airplane.
C. The FMCS allows the operator to preplan an entire flight. These procedures are simplified by FMCS integration of navigation, guidance, and performance management functions. In conjunction with other FMS components, the FMCS provides automatic lateral guidance, vertical guidance and speed control (within constraints of air traffic control). The flight preplan function allows a route to be preplanned from origin to destination. The preplan is from data stored in the navigation data base. The FMCS calculates minimum cost flight profiles for climb, cruise and descent, which may be used by the DFCS and the A/T for automatic flight control through the LNAV and VNAV modes. In addition all computed values are displayed to aid the pilot in flying the optimum profile using manual control.
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