EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH DUAL FMC ú

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 ú CONFIG ú 04 Page 68 ú Mar 12/00
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A
737-300/400/500MAINTENANCE MANUAL
 D. Control
 (1)  Prepare FMCS for Flight
 (a)  Provide external electrical power to airplane and energize buses on the P6 and P18 circuit breaker panels.
 CAUTION: ENSURE EQUIPMENT COOLING IS OPERATED BEFORE TURN ON OF
_______ ELECTRONIC SYSTEMS OR DAMAGE TO EQUIPMENT MAY RESULT. EQUIPMENT COOLING SYSTEM MUST BE SET FOR NORMAL COOLING AS DESCRIBED IN AMM 21-58-00.
 ENSURE THAT COOLING AIR IS AVAILABLE TO IRS NAVIGATION UNITS BEFORE OPERATING IRS. FAILURE TO PROVIDE ADEQUATE AIR SUPPLY WILL RESULT IN FAILURE OF NAVIGATION UNITS.
 (b)  
Provide cooling air to electronic equipment (AMM 21-58-00).

 (c)  
Make sure all IRS circuit breakers are closed.

 (d)  
Position both IRS mode select switches to align.

 (e)  
To turn on FMCS, close all FMCS circuit breakers.

 (f)  
The following procedures use the CDU screen display to initialize the FMC.

 (g)  
At initial turn on, the IDENT page will be displayed on the CDU. This provides a means of reviewing the FMC data base, current NAV data base and type of engines installed. Check information for accuracy.

 (h)  
Press line select key (LSK) 6R (POS INIT>). This provides access to data pages, for initialization of the FMCS.

 (2)  Position Initialization
 (a)  When POS INIT page is displayed, enter present position latitude and longitude into the SET IRS POS data field. Present position can be entered by either of the three following ways: selecting the stored LAST POS, entering and ICAO identifier, or direct entry. 1) The FMC NV RAM memory stores the last position determined
 by the FMCS at completion of the previous flight. If the airplane has not moved significantly since shut-downs this last position (LAST POS) may be line-selected into the CDU scratch pad, by pressing line select key 1R, then enter into the SET IRS POS data field by pressing line select key 4R.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH DUAL FMC ú

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 ú CONFIG ú 03 Page 69 ú Jul 12/01

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 2)  Entry of an airport identifier, contained in the navigation data base, into the REF AIRPORT data field will bring up on the display that airport's reference position, for selection into the SET IRS POS data field.
 3)  Present position can be manually entered into the scratch pad, by using the CDU keyboard keys. The data can then be entered into the SET IRS POS, by pressing line select key 4R.
 (b)  
If an IRS does not accept the FMCS initialization, a RE-ENTER IRS POS message appears in the scratch pad, indicating that the operator should repeat the procedure, after clearing the scratch pad.

 (c)  
The FMC automatically receives and displays Greenwich Mean Time (GMT) data from the airplanes GMT clock system. The time displayed on the CDU can, however, be changed to display local time, while GMT remains inputed to the FMC data base. 1) The FMCS will accept for display the hours portion of the

 local time entry, and continue to use the minutes information from the GMT clock.
 (3)  
Position both IRS mode select switches to NAV.

 (a)  Pressing the NEXT PAGE key will advance the display to the POS REF page, this allows the operator to compare the position reported by each IRS with that computed by the FMC.

 (4)  
Flight Plan Selection

 (a)  
The route pages can be accessed from the POS INIT or POS REF pages, by pressing line select key 6R (ROUTE>).

 (b)  
The RTE pages provide a way of entering flight plan routes into the FMC. The operator can create a list of horizontal navigation waypoints that will make up the planned route in either of two ways: Entry of a company route identifier; or Manual entry of each waypoint and interconnecting path.