Narrative:

We were on a night training flight for night currency. The pilot flying was planning to update her night currency. I was acting as PIC/CFI/PNF in the right seat.we met at the airport approximately xa:45 pacific time. After preflighting the aircraft we started engines at approximately xb:20. Some engine roughness was noted at startup but was resolved after leaning and runup checklist was completed. Additional time was lost waiting for a transient aircraft who was lost on the airport trying to find his way to a gate for exit. I informed the pilot flying to hold position until the transient airplane was clear of all runways. We offered assistance via radio to the transient pilot whom we directed to the ramp.we made a normal takeoff on runway xxl; retracted the landing gear; and entered a normal left traffic pattern. On downwind we extended the landing gear and continued to a normal landing with full stop. We then taxied back for another takeoff and entered the downwind leg. Upon reducing power for the approach we noticed some engine roughness which I attributed to 'pushing the prop' because of our relatively high airspeed and being full rich at minimal power. The pilot flying thought it was an engine malfunction so I attempted to adjust the mixture to no satisfaction to the pilot flying. I directed the pilot flying to go to full flaps for landing as we were turning final and speed seemed high. We continued the approach to landing and failed to do a 'gump' check for landing gear due to our distraction resulting from the engine issue.we did not get a gear warning alarm even though the mp was at 11 inches. Had that alarm sounded; we would have; if time and altitude allowed; been able to extend the landing gear or otherwise execute a go-around.this is a case of two senior pilots trusting each other to 'take care of business.' the distraction with the engine caused me to forget the pre-landing checklist which I assumed the PF was managing but was really my responsibility as CFI/PIC.the result was a gear-up landing which resulted as a very smooth landing with minimal damage to the aircraft and no injuries to personnel.

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Original NASA ASRS Text

Title: Bonanza pilot reported that distraction and failure to follow the checklist resulted in a gear-up landing.

Narrative: We were on a night training flight for night currency. The pilot flying was planning to update her night currency. I was acting as PIC/CFI/PNF in the right seat.We met at the airport approximately XA:45 pacific time. After preflighting the aircraft we started engines at approximately XB:20. Some engine roughness was noted at startup but was resolved after leaning and runup checklist was completed. Additional time was lost waiting for a transient aircraft who was lost on the airport trying to find his way to a gate for exit. I informed the Pilot flying to hold position until the transient airplane was clear of all runways. We offered assistance via radio to the transient pilot whom we directed to the ramp.We made a normal takeoff on Runway XXL; retracted the landing gear; and entered a normal left traffic pattern. On downwind we extended the landing gear and continued to a normal landing with full stop. We then taxied back for another takeoff and entered the downwind leg. Upon reducing power for the approach we noticed some engine roughness which I attributed to 'pushing the prop' because of our relatively high airspeed and being full rich at minimal power. The pilot flying thought it was an engine malfunction so I attempted to adjust the mixture to no satisfaction to the pilot flying. I directed the Pilot Flying to go to full flaps for landing as we were turning final and speed seemed high. We continued the approach to landing and failed to do a 'GUMP' check for landing gear due to our distraction resulting from the engine issue.We did not get a gear warning alarm even though the MP was at 11 inches. Had that alarm sounded; we would have; if time and altitude allowed; been able to extend the landing gear or otherwise execute a go-around.This is a case of two senior pilots trusting each other to 'Take care of business.' The distraction with the engine caused me to forget the pre-landing checklist which I assumed the PF was managing but was really my responsibility as CFI/PIC.The result was a gear-up landing which resulted as a very smooth landing with minimal damage to the aircraft and no injuries to personnel.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.