Chances are it was a single engine approach, so 1 throttle would've been right on the gear warning switch anyway - only a few examiners get annoyed enough by it to advance the throttle significantly beyond zero thrust to stop the noise.

I don't recall there being a bell on the DA42? :confused:

But yes, it was a single engined hold and NDB approach, so if there is normally a noise madlandrover's explanation might be correct.

If its like the aircraft if fly now, or the Seminole i did the IR initial on, the horn will sound when the gear is up and one or both power levers are at or within a few degrees of flight idle. There is usually a horn cancel button to silence this, in the case of, say, a rapid descent.

Perhaps the Examiner pressed this?

IIRC on the seminole, the horn couldnt be cancelled with landing flaps down and gear up, but could with intermediate flap.

On a lighter note, as most of the descents i do now are at flight idle, it prompts many calls (as the horn starts blaring) "don't worry, i've got the horn..." :}