Narrative:

Failed to lower landing gear. Suggest always checking gear warning horn on downwind by retarding throttle and connecting gear check with base turn call. With full flaps and idle power, gear warning did not occur.

Google
 

Original NASA ASRS Text

Title: C337 PLT HAS A GEAR UP LNDG AT ZZZ.

Narrative: FAILED TO LOWER LNDG GEAR. SUGGEST ALWAYS CHKING GEAR WARNING HORN ON DOWNWIND BY RETARDING THROTTLE AND CONNECTING GEAR CHK WITH BASE TURN CALL. WITH FULL FLAPS AND IDLE PWR, GEAR WARNING DID NOT OCCUR.

Data retrieved from NASA's ASRS site as of July 2007 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.