When would the N1 button the MCP be used? For takeoff and go around, the TOGA switches are used.

It may be used as part of a take-off sequence, as follows: Above 400' RA call for roll mode (HDG SEL or LNAV). At thrust reduction height 800' set climb thrust PUSH N1 switch. Verify climb thrust. At acceleration height say 1000' set flaps UP speed. After retraction call VNAV. Then engage autopilot. There may be variations of this sequence but this will give you an idea of where N1 switch may be used. Btw don't try this on the NGX (post HF4) because it won't work, at least the FD bars will not command the MCP speed you select. I believe this is a bug for an SP1 remedy.

Which is please the key to press to have a constant and correct taxi speed instead ? Thx !

Which is please the key to press to have a constant and correct taxi speed instead ? Thx !

There is no such thing, you will have to manage taxi speed with the throttles. Or take a car with cruise control instead of a 737 :-)

There is no such thing, you will have to manage taxi speed with the throttles. Or take a car with cruise control instead of a 737 :-)

LOL I wonder why there is no such option to set it f.i. @ 15-20 knots....... who can be disengaged just braking

Okay, let me set up the scenerio here. I am doing a loop6.dag departure out of LAX and the N1 is set for 86% so I start my take off run. Part of the constraint is no LNAV/VNAV below 5000' so manual flight. The FMS has LAX(init) as first point, vectors for second and KEGGS for third. Altitude is 415 to 3000 for initial then vectors to heading 235 for 15 nm out of LAX following the charts. ATC altitude is 10,000 or higher upon crossing LAX VOR. My issue is, when I take off I have Autothrottle set and is accelerating the FMS has appropriate speeds for below 10,000 of 250kts or less all is great. When I hit the R-160 from SMO point and execute the left to 235 degrees on my climb out 2800-3000' per minute the FMS changes and startes to drive speed to 301kts. How can I keep the FMS from changing till I tell it to switch to KEGGS? http://204.108.4.16/...0/00237LOOP.PDF

Okay, let me set up the scenerio here. I am doing a loop6.dag departure out of LAX and the N1 is set for 86% so I start my take off run. Part of the constraint is no LNAV/VNAV below 5000' so manual flight. The FMS has LAX(init) as first point, vectors for second and KEGGS for third. Altitude is 415 to 3000 for initial then vectors to heading 235 for 15 nm out of LAX following the charts. ATC altitude is 10,000 or higher upon crossing LAX VOR. My issue is, when I take off I have Autothrottle set and is accelerating the FMS has appropriate speeds for below 10,000 of 250kts or less all is great. When I hit the R-160 from SMO point and execute the left to 235 degrees on my climb out 2800-3000' per minute the FMS changes and startes to drive speed to 301kts. How can I keep the FMS from changing till I tell it to switch to KEGGS? http://204.108.4.16/...0/00237LOOP.PDF

Your post could probably use its own thread. There's no N1 button issue here. Since we're here. . . what altitude are you crossing the SMO R-160? Are you already clean? Also, why do you say no LNAV/VNAV below 5000'?

The scenerio provided was to perform manual takeoff and then vectors to the LAX VOR using the LOOP6 departure. Part of it was to only engage autopilot after 5000'. the SMO R-160 was about 1.1 nm out from KLAX and I was gear up, Flaps up and crossed at approx 2500 ft with a 2800 or 2900 FPM climb then executed a left to 235. I asked about the N1 setting in this forum as it was the N1 I was having concerns about. IT was following the FMS programming up till I reached SMO and then the vectors cleared and the next waypoint KEGGS was active in my FMS and then proceeded to push N1 for 301 knots. I can not change to speed setting and adjust to 250 or less unless autopilot is engaged.

The scenerio provided was to perform manual takeoff and then vectors to the LAX VOR using the LOOP6 departure. Part of it was to only engage autopilot after 5000'. the SMO R-160 was about 1.1 nm out from KLAX and I was gear up, Flaps up and crossed at approx 2500 ft with a 2800 or 2900 FPM climb then executed a left to 235. I asked about the N1 setting in this forum as it was the N1 I was having concerns about. IT was following the FMS programming up till I reached SMO and then the vectors cleared and the next waypoint KEGGS was active in my FMS and then proceeded to push N1 for 301 knots. I can not change to speed setting and adjust to 250 or less unless autopilot is engaged.

Hmm. Lot's of things going on here, maybe. What type of takeoff are you performing? (eg. NADP-1, -2, another profile.) You're saying two things that aren't related when it comes to manual and LNAV/VNAV. Manual flight means no autopilot. You can still have LNAV and/or VNAV and fly by hand. The N1 button won't change your airspeed, it'll change your engine thrust limit. When you say you can't change your airspeed to 250 without the A/P on, why is that? What does your FMA say? Screenshots might help here, too. Maybe a shot of the legs page and the PFD, specifically.