M-20 M Bravo
Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Commercial
Situational Awareness; Training / Qualification; Troubleshooting; Communication Breakdown; Human-Machine Interface; Confusion
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR; Ground Event / Encounter Gear Up Landing
Aircraft Aircraft Damaged; General Flight Cancelled / Delayed; General Maintenance Action
Procedure; Human Factors; Aircraft
We left for ZZZ to do takeoff and landings. On takeoff; we were on the left tank; and left the left fuel gauge changed to empty. I pointed this out to the owner; he tapped on the gauge and it showed almost full. We entered the pattern and got no gear down in the annunciator panel I pointed this out to the owner and he said the gear is down and didn't seem surprised. We verify this with a small window on the floor between the front seats. We did several takeoff and landings and never got an annunciator panel gear down indication. The last landing was to be a short field landing. I reminded him not to get below 75 knots until in a low flare and ready to land. Previously his airspeed varied a lot on final. On a half mile final he was exactly at 75 knots. He seemed to be working hard on maintaining 75 knots. I was really focusing on his airspeed to be sure he didn't get below 75. Just seconds before touchdown we heard a 'go-around' on the radio we didn't know who it was for; why; or where it was coming from. No mention of plane type or reason. A few seconds before touchdown we both scanned the runway to be sure there was nothing on the runway. No gear down indication on the annunciator had been routine each time. I was guilty of confirmation bias that the gear was down. Fixating on the airspeed contributed to the incident. At no time during the landing did we get a gear warning or stall warning. In the future if the annunciator light becomes inoperative; I will use the small window on the floor each time in place of the annunciator light.
M-20 M Bravo instructor pilot reported a gear up landing after disregarding a known malfunction with the landing gear position and warning system.