Instructor and student pilot landed small aircraft twin, gear up.

Attributes
ACN	122936
Time
Date	198909
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mkt
State Reference	MN
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor observation : company check pilot
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 146 flight time total : 719
ASRS Report	122936
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : private
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other other : unspecified cockpit
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

Departed mankato and returned to mankato, local IFR training practicing IFR procedures. VOR outbnd descent to 2600' on VOR outbnd 33 approach, reduced power, gear horn and red unsafe light went on. Reached 2600'. Power was increased to maintain 2600 and 110 KTS. Procedure turn inbound established. Lowered gear handle. Student called 3 green and power reduction for descent. During descent student removed hood on final, made another gumps check. Student called 3 green and proceeded to land runway 33 and landed gear up. When student put gear down and called 3 green, I verified 3 green during descent and final. As of date investigation is continuing into problem with no conclusions.

Original NASA ASRS Text

Title: INSTRUCTOR AND STUDENT PLT LANDED SMA TWIN, GEAR UP.

Narrative: DEPARTED MANKATO AND RETURNED TO MANKATO, LOCAL IFR TRAINING PRACTICING IFR PROCS. VOR OUTBND DSCNT TO 2600' ON VOR OUTBND 33 APCH, REDUCED POWER, GEAR HORN AND RED UNSAFE LIGHT WENT ON. REACHED 2600'. POWER WAS INCREASED TO MAINTAIN 2600 AND 110 KTS. PROC TURN INBND ESTABLISHED. LOWERED GEAR HANDLE. STUDENT CALLED 3 GREEN AND POWER REDUCTION FOR DSCNT. DURING DSCNT STUDENT REMOVED HOOD ON FINAL, MADE ANOTHER GUMPS CHECK. STUDENT CALLED 3 GREEN AND PROCEEDED TO LAND RWY 33 AND LANDED GEAR UP. WHEN STUDENT PUT GEAR DOWN AND CALLED 3 GREEN, I VERIFIED 3 GREEN DURING DSCNT AND FINAL. AS OF DATE INVESTIGATION IS CONTINUING INTO PROBLEM WITH NO CONCLUSIONS.

Data retrieved from NASA's ASRS site as of August 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.