PSAjet17 From United States of America, joined Dec 2003, 296 posts, RR: 0 Reply 6, posted (8 years 4 months 2 weeks 2 days 21 hours ago) and read 2765 times:
One of the guidelines used for aircraft is things must appear and operate in logical order and in the direction the equipment works in. From the captains seat items are numbered sequentially from left to right and from front to back. Gear handle goes up to raise gear, down to lower. Flap handle moves back to lower flaps and forward to raise them. Turn the control yoke to the left to make the plane go left, etc.