Narrative:

This incident occurred during the approach phase of the second leg of the flight. I was the pilot flying from the right seat. We were instructed by ATC to hold 10;000 feet and I had selected 265 knots for the speed. When ATC gave us a lower altitude; I selected the lower altitude on the MCP and set the speed to 250 knots. As my attention was directed to the speed window on the MCP; the pilot monitoring alerted me that we were descending below 10;000 feet with the speed greater than 250 knots. I immediately selected altitude hld and allowed the speed to slow to 250 knots before continuing the descent. Our altitude was no lower than 9;800 above 250 knots and the speed was less than 265; but above 250 knots between 9;800 and 10;000 feet.I should have slowed the aircraft prior to the descent. One of the contributing factors was I had been on reserve duty during the previous month and had operated only one flight during the entire month and the only other flight prior to this one was in a different variant of the aircraft. Nevertheless; I should have mitigated the lack of recency of experience in the seat by having slowed the aircraft to 250 knots while we were level at 10;000 feet as I was expecting ATC clearance for a lower altitude. Or I should have mentally prepared to slow the aircraft prior to descending.

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Original NASA ASRS Text

Title: Air carrier flight crew reported going over 250 knots below 10;000 feet. Pilot flying made reference to lack of flying as a contributing factor.

Narrative: This incident occurred during the approach phase of the second leg of the flight. I was the pilot flying from the right seat. We were instructed by ATC to hold 10;000 feet and I had selected 265 knots for the speed. When ATC gave us a lower altitude; I selected the lower altitude on the MCP and set the speed to 250 knots. As my attention was directed to the speed window on the MCP; the Pilot Monitoring alerted me that we were descending below 10;000 feet with the speed greater than 250 knots. I immediately selected ALT HLD and allowed the speed to slow to 250 knots before continuing the descent. Our altitude was no lower than 9;800 above 250 knots and the speed was less than 265; but above 250 knots between 9;800 and 10;000 feet.I should have slowed the aircraft prior to the descent. One of the contributing factors was I had been on reserve duty during the previous month and had operated only one flight during the entire month and the only other flight prior to this one was in a different variant of the aircraft. Nevertheless; I should have mitigated the lack of recency of experience in the seat by having slowed the aircraft to 250 knots while we were level at 10;000 feet as I was expecting ATC clearance for a lower altitude. Or I should have mentally prepared to slow the aircraft prior to descending.

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.