Simviation Forums

Hi buddies.

i've got 2 simple questions: Where can i find the Auto Brake on the Airbus Aircrafts? i can just see parking brakes :/
And...What is that N1 Set for?! how does it work? (Boeing)

Thank you!

If the Airbus panel in FSX is anything like it's real world counterpart, the autobrake selector buttons should be located underneath the landing gear position indicator lights and above the landing gear lever.

N1 refers to the first stage compressor in the engine. The N1 gauge shows the speed of the N1 compressor stage.

And...What is that N1 Set for?! how does it work? (Boeing)

Just incase you've got N1 mixed up with V1, V1 is the calculated speed that the aircraft is rotated (lifted off the runway) at on takeoff. This speed depends on aircraft weight, wind and air pressure effecting engine power.  :)

What is that N1 Set for?! how does it work? (Boeing)

Correct me if I'm wrong (I probably am), but I believe the N1 Set is similar to Speed Hold. You can use the N1 Set dial and select a level on the N1 gauge, and then (with the auto throttle switch on, of course) hit N1 Hold, and the auto throttle will hold the N1 at the selected level. I always thought the N1 was just a read-out of your engine thrust in percentage. Maybe not...

Correct me if I'm wrong (I probably am), but I believe the N1 Set is similar to Speed Hold. You can use the N1 Set dial and select a level on the N1 gauge, and then (with the auto throttle switch on, of course) hit N1 Hold, and the auto throttle will hold the N1 at the selected level. I always thought the N1 was just a read-out of your engine thrust in percentage. Maybe not...

Yeah thats about right. On some aircraft you can set N1 for take-off, climb and cruise, and the auto-throttle will maintain it. But don't confuse this with IAS hold, that simply governs what speed the auto-throttle has to maintain for the aicraft, regardless of the N1 percentage.

I always thought the N1 was just a read-out of your engine thrust in percentage. Maybe not...

In a sense yes. It's telling you have fast the N1 compressor is rotating... The faster it rotates the more thrust you get!  ;)

N1 is used on takeoffs and climbs as the target reference.
However most engine manufacturers still uses EPR as the primary indicator (more convenient back in the days with low by-pass engines).

Of the big Boys, General Electric use N1.
Rolls Royce and Pratts still have the EPR.

N1 is also used as turbulent penetration thrust reference (at least in the 737's), recommended by the FMC. It's for pilots use since it cannot be sent to the Autothrottle AFAIK.