Hey Fedex421,

This plane works a lot like the real plane.

You said you read the manual???  ::)

Part III – Normal Procedures - On page 10 of the 757 manual from Captain Sim - you must have missed that page!  :P

During pre-flight you place the IRS to NAV.

IRS mode selectors…………………………………………OFF, then NAV
Verify ALIGN lights illuminated.
For all flights, a full alignment is recommended.

You must then enter the aircraft position in the CDU under POS INIT.

Once you start the alignment process, you can then build the flight plan.

The ALIGN lights are blinking because they are telling you they NEED the planes position! Once the position is entered the lights will stop blinking and the IRS will be set for NAV.

Fedex said: I can make them turn off by switching to the ATT position, but i have no idea what that does as it is not mentioned in the manual.

It is mentioned in the manual: ‘757 Captain’ FLIGHT MANUAL Part II – Aircraft Systems page 11  :o

6, 7, 8. IRS Mode Selectors
Rotate - controls mode of related IRS.
Must be pulled out to move from NAV position.
OFF-
- alignment is lost
- ALIGN light illuminates for 30 seconds as system goes through a shutdown sequence
- realignment requires about 30 seconds while the airplane is parked and entry of present position
(latitude and longitude).
ALIGN-
- initiates alignment when parked
- initiates a quick alignment if selected when the system is in the navigation mode.
NAV-
- normal operational mode
- permits system to enter NAV mode after completing alignment
- initiates a 30 seconds alignment if selected from OFF.
ATT-
- provides only attitude and heading information
- position and ground speed information lost until system realigned on ground
- when selected airborne, ALIGN light illuminates for 30 seconds while system senses local level
(requires level flight)
- magnetic heading input required to initialize heading output
- the selector must be cycled through OFF to re-enter ALIGN or NAV mode.
© 2011 Captain Sim www.captainsim.com

This plane is a complex modern aircraft, so you do need to read the CS manual.

Lou  ;)