LNAV wont engage

[Scope 0]

I had a flight last night from EKCH to LOWW, but i never succeded in LNAV engage. It always didnt light up when pushed on MCP. I've checked no failures and route should also be ok. I also tried a later waypoint to make sure it was not caused by not able to "catch" the navigation. Hope you can help Jesper Giørtz-Behrens

[xxJohnxx 21]

Hi,Have you set both FDs to on?

[Ingrimmsch 0]

From introduction manual: I couldn’t get LNAV to arm/engage: LNAV has some specific parametersthat must be met in order for it to arm/engage. These are: • To arm LNAV while on the ground: The first waypoint in yourflight plan must be within 5 degrees of the departure runwaycourse.• To arm LNAV in flight : Requires a valid interception point foractive leg, interception angle less than 90 degrees OR within 3miles cross tracks error OR within 3 miles from active. LNAV willstay armed until interception.

[Scope 0]

I got the solution my self :) It was my right IRS not working. Just changed my IRS settings in overhead panel and BINGO it worked :) Just loves this plane