[macleodan]

He forgot to deploy landing gear.

[ville]

He was speaking about light aircraft. Such planes like probably more often have nonretractable landing gear?

[emillon]

On small planes, landing gear is not retractable.

[mvgoogler]

There are plenty of small planes with retractable gear.

The reality is that it doesn't really matter. Landing gear-up is almost always survivable - for the people at least :-)

Distracting someone with trying to find and operate the landing gear would probably be as likely to cause problems as it would be to help.