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You can update NAV database using a set of floppy disks containing the NAV

 database .

You will also need to use MCDU , MDDU , DLS and CBs

In case you need to make NAV database update or any other t ype of task

 on an aircraft you shou ld refer to its manufacturers' certifi ed updated 

manuals.

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Step 1: Preparation and Notation

Lets see some things that can make our process easy.

MDDU ( Mult Disk Data Unit ) -------- > Floppy Disk reader.

DLS ( Data Loading Selector ) -------- > Used to route software from MDDU to

 specific selected computer.

CB Circuit Breaker -------- > Used to disconnect electric power supply from

 specific computer for isolation and reset.

MCDU ( Multifunction Control Display Unit ) -------- > The two small screens and

 keyboards on the central pedestal.

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Step 2: Start

- Pull FMGC 1 CB and FMGC 2 CB

- Set DLS ON/OFF Switch to ON

- Press NEXT Switch on DLS until you get FMGC 1 on LCD

- Press SELECT CTL Switch on DLS to select FMGC 1

- Put Disk 1 into the MDDU

- Put FMGC 1 CB to ON

You find that the LCD on the MDDU has the message Transfer in Progress

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Step 3: Disks to Go

 As the Disk 1 finishes loading , the message " Eject Disk " appears and

 message " Insert Disk 2 " appears.

Now , you can eject Disk 1 and Insert Disk labeled 2 .

The process is repeated for Disk 2 , Disk 3 and Disk 4 .

Then you see the message " Transfer Complete " indicating that the NAV

 Database has been successfully loaded for FMGC 1.

Now on the Data Loading Selector  , press Next until you get FMGC 1 on the

 LCD , then press SEL CTL

to deselect FMGC 1 . Then put DLS ON/OFF switch to OFF position.

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Then we want to verify that FMGC 1 has been uploaded

with new NAV

 database.

Reset FMGC 1 by pulling FMGC 1 CB for 10 seconds then

push it back.

On MCDU 1 press the button

DATA .

Then press the Line Select Key ( LSK ) adjacent to < A/C

STATUS .

Then you get the page that views the old ( ACTIVE ) NAV

Database and the

 new ( SECOND ) NAV Database .

You can see that the new NAV Database has been uploaded

successfully.

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Step 4: Cross Load FMGC 2

Here , we will cross-load NAV Database from FMGC 1 to FMGC 2 from

 computers directly without using any disks.

First , push FMGC 2 Circuit Breaker ( CB ) to activate FMGC 2 .

Then , on MCDU 1 , press DATA button ,

Line Select Key ( LSK  ) adjacent to STSUS/XLOAD > ,

NOTES

 - Make sure that on the top right of the page you see 3/7 , this means that this is  the third

page of the software pages of the FMGC . The third page is the NAV  database . This is

important because you don't want to cross-load the entire  software pages of FMGC 1 to

FMGC 2 , but you want to cross-load the NAV   database page only ( the third page ).

 - Make sure that you see the phrase XLOAD FM1 TO FM2 .

This is very important because you want to cross-load NAV database page from

 FMGC 1 to FMGC 2 not the opposite. Be Careful.

Line Select Key ( LSK  ) adjacent to START ,

Line Select Key ( LSK  ) adjacent to * CONFIRM

The cross-load process starts and takes only about 3:20 minutes.

Then you see the phrase FM1/FM2 IDENTICAL .

Now you want to reset FMGC 1 and FMGC 2 by pulling FMGC 1 CB and FMGC

 2 CB for 10 seconds then pushing them .

Now you have successfully uploaded FMGC 1 with NAV database and cross-loaded

FMGC 2 from FMGC 1.

Don't forget to sign off the aircraft Technical Log Book ( TLB  ).