It would be particularly hard not to notice, as the gear not down warning would be sounding for a good portion of the approach. In the PIA case there seem to ha

It would be particularly hard not to notice, as the gear not down warning would be sounding for a good portion of the approach. In the PIA case there seem to have been multiple warnings sounding that the pilots did not resolve - it's hard to say why, perhaps alert fatigue related to not following normal landing procedures normally.