but the nose gear will probably move up. Just one question here from me: Why ?
Why? Many years ago a 727 was on final to a Pacific atoll. Due to erroneous VASIS light signals (vandalism) it came in too high on a black hole approach and despite max braking on the 5600 ft length runway, the pilot feared the aircraft may not stop by the end of the runway. There was no suspicion that the VASIS was other than serviceable until too late. There was no prepared overrun and the hazard was a boulder strewn cliff 10 metres from the departure threshold. For a fleeting second the captain considered retracting the landing gear since he estimated max braking wasn't going to stop the aircraft. However the 727 was able to stop with the nosewheel right on the extreme end of the runway.
The incident brought up the technical issues involved with pulling the gear up using the over-ride trigger on the landing gear lever. Pprune is the best place to ask around as there are very experienced and knowledgeable people that read Pprune who do not necessarily contribute unless it is in their area of expertese. The various answers were most instructive especially the points about only the nose-wheel retracting by use of the landing gear over-ride switch. Thank you all, for your replies.