A34-61-00-059.fm
FMCS BITE PAGES -SENSORS
January 1, 2004
34-61
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
FMCS BITE PAGES - DISCRETES THIS PAGE INTENTIONALLY LEFT BLANK
January 1, 2004
34-61
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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
FMCS BITE PAGES - DISCRETES General
To do a check of FMCS discretes status, select DISCRETES on LSK 4L, from the FMCS BITE page.
Discretes Pages
These pages shows the current status of the analog discretes that send data to the FMC.
If the two FMCs do not agree on the status of a discrete, a highlight shows around the status field for that discrete. In the example shown on the graphic, FMC 1 does not see the right ECS PACK on.
These are the discretes that you can see on page 1:
-ECS PACK. Shows the position of the ECS flow control and shut
off valve in each pack. -ECS PACK H/L. Shows if the pack is in normal or high flow mode. -ISOL VALVE. Shows the position of the bleed air isolation valve. -COWL A/ICE. Shows the position of the engine cowl anti-ice
switches on the P5 overhead panel. -WING A/ICE. Shows the position of the wing anti-ice switches on the P5 overhead panel.
-OLEO SWITCH. Shows the airplane in the ground or air modes. This input comes from the proximity switch electronic unit (PSEU).
These are the discretes that you can see on page 2:
-FAA/JAA FLIGHT RULES - This option sets the CG for the
applicable regulatory flight rules.

737-700 MAINTENANCE TRAINING MANUAL
-KILOGRAM OPTION - This option sets the default for weight
entries on the MCDU. -MAG/TRUE - This option is not used. -SRCE/DEST IDENT. This option is used to identify the FMC. It is
always configured to left. -ASPIRATED TAT - This option is enabled when an aspirated TAT probe is installed on the airplane. -DEGREE C/DEGREE F DEFAULT. This option sets the default for temperature entries on the MCDU. -PERF CODE - This option sets the performance code for the FMC. It is normally set to 1.
All the options on page 2 are set with the programmable switch modules.
These are the discretes that you can see on page 3:
-FMC SOURCE SEL. Shows the position of the FMC source
select switch on the P5 overhead panel.

-MODEL/ENGINE. Shows the current status of the engine/airframe program pins to the FMC. This is set through the programmable switch modules.
-ENGINE BLEED. Shows the position of the engine bleed air
switches on the P5 overhead panel.

-SEL CONFIG MODE. This option enables the loadable software configuration. This is set through the programmable switch modules.
These are the discretes that you can see on page 4:
-VOR INHIBIT - This option disables VOR inputs for the navigation function.
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