BE35 flight instructor elaborated the events leading up to a gear up landing.

Narrative:

On final approach the pilot flying reached over to extend the landing gear. He successfully accomplished the task; based on the fact that I saw the gear handle move into downward position; heard the gear system extending; felt the aircraft slow noticeably; and saw the three green lights; associated with the landing gear; illuminate. As we continued our approach; the pilot extended the flaps in further preparation for landing; and we prepared for a normal landing. As we flared out for landing; I heard a loud noise; and I assumed the landing gear had collapsed. I called 'my airplane;' and took control. I cannot say whether the other pilot acknowledged the 'my airplane' call; but I used the rudder and ailerons to maintain directional control as best I could. As we skidded to a stop; smoke began to appear in the cockpit. I ordered everyone to leave their things and get out. Being by the only door; I held it and waited for everyone to exit before leaving the aircraft. It is my judgment that I did everything that was necessary; except to verify that the gear was indeed still extended on short final. In the future; I will be sure to triple check the three green indicators. As to the cause of the incident; I cannot say. I saw the pilot extend the gear; and I saw the green lights; indicating the gear was down and locked about 90 seconds before touchdown. Thankfully; no one was injured; and no damage to the airport was apparent.

Original NASA ASRS Text

Title: BE35 Flight Instructor elaborated the events leading up to a gear up landing.

Narrative: On final approach the pilot flying reached over to extend the landing gear. He successfully accomplished the task; based on the fact that I saw the gear handle move into downward position; heard the gear system extending; felt the aircraft slow noticeably; and saw the three green lights; associated with the landing gear; illuminate. As we continued our approach; the pilot extended the flaps in further preparation for landing; and we prepared for a normal landing. As we flared out for landing; I heard a loud noise; and I assumed the landing gear had collapsed. I called 'my airplane;' and took control. I cannot say whether the other pilot acknowledged the 'my airplane' call; but I used the rudder and ailerons to maintain directional control as best I could. As we skidded to a stop; smoke began to appear in the cockpit. I ordered everyone to leave their things and get out. Being by the only door; I held it and waited for everyone to exit before leaving the aircraft. It is my judgment that I did everything that was necessary; except to verify that the gear was indeed still extended on short final. In the future; I will be sure to triple check the three green indicators. As to the cause of the incident; I cannot say. I saw the pilot extend the gear; and I saw the green lights; indicating the gear was down and locked about 90 seconds before touchdown. Thankfully; no one was injured; and no damage to the airport was apparent.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	850980
Time
Date	200909
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Bonanza 35
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	None
Component
Aircraft Component	Landing Gear
Person 1
Function	Instructor Pilot Not Flying
Qualification	Flight Crew Flight Instructor Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 68 Flight Crew Total 1630 Flight Crew Type 7
Events
Anomaly	Ground Event / Encounter Gear Up Landing