Pilot test flying his aircraft prior to scheduled maintenance manages a gear up landing.

Attributes
ACN	144384
Time
Date	199004
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : tyk airport : iyk
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	landing other other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 3 flight time total : 1070 flight time type : 150
ASRS Report	144384
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was test flying the aircraft prior to shop work and 100 hour inspection. I remained in the local pattern (runway 28) for 2 touch and go's and engine to allow temperatures to stabilize. The landing gear worked fine. I was also recording the egt, cylinder temperature, oil temperature, fuel and oil pressures on both engines for analysis during shop time. The third and last landing was really 'final'. The landing gear was not down. I had been using 'gump' procedures, but do not remember 'not' doing the check during the third circuit. I was tired, did not have lunch and it was late afternoon, but do not think it affected my performance. The fuselage belly skin (forward), 2 antennas and a couple of landing gear cowl pieces will require repair. Also both propellers. No other damage is evident. No injuries.

Original NASA ASRS Text

Title: PLT TEST FLYING HIS ACFT PRIOR TO SCHEDULED MAINTENANCE MANAGES A GEAR UP LNDG.

Narrative: I WAS TEST FLYING THE ACFT PRIOR TO SHOP WORK AND 100 HR INSPECTION. I REMAINED IN THE LCL PATTERN (RWY 28) FOR 2 TOUCH AND GO'S AND ENG TO ALLOW TEMPS TO STABILIZE. THE LNDG GEAR WORKED FINE. I WAS ALSO RECORDING THE EGT, CYLINDER TEMP, OIL TEMP, FUEL AND OIL PRESSURES ON BOTH ENGS FOR ANALYSIS DURING SHOP TIME. THE THIRD AND LAST LNDG WAS REALLY 'FINAL'. THE LNDG GEAR WAS NOT DOWN. I HAD BEEN USING 'GUMP' PROCS, BUT DO NOT REMEMBER 'NOT' DOING THE CHK DURING THE THIRD CIRCUIT. I WAS TIRED, DID NOT HAVE LUNCH AND IT WAS LATE AFTERNOON, BUT DO NOT THINK IT AFFECTED MY PERFORMANCE. THE FUSELAGE BELLY SKIN (FORWARD), 2 ANTENNAS AND A COUPLE OF LNDG GEAR COWL PIECES WILL REQUIRE REPAIR. ALSO BOTH PROPS. NO OTHER DAMAGE IS EVIDENT. NO INJURIES.

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.