When you arrive at the Aiport Bridge with Chris pull the lever for the Bridge and a message ill come and say one of the oil meters has failed. Carry on over the bridge and into the Bridge Engine Room, look to your left and you should see 4 Meters, 1 of which is broken, you must fill 10 meters using a 5 meter and a 3 meter. Do your maths this can't be done.

Hit the 3 button twice, which equals 6, then hit the 5 which then adds up to 11, but because what we need to fill is a 10 and we have 11, the 5 meter will now become a 1, so now all we have to do is hit the 3 meter, 3 times which equals 9, then hit the 1 which equals 10. Now the Bridge will be up and running so you can operate the bridge fully !