LA4-200 pilot reported a gear up landing when the main gear failed to extend during approach.

Attributes
ACN	1423463
Time
Date	201702
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Seaplane or Amphibian
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	None
Component
Aircraft Component	Main Gear
Person 1
Function	Single Pilot
Qualification	Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Commercial
Experience	Flight Crew Last 90 Days 6 Flight Crew Total 2108 Flight Crew Type 600
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Ground Event / Encounter Ground Strike - Aircraft

Narrative:

This was an incident because the only damage to the aircraft was a scrapped keel. Lake amphibian LA4-200. On approach to landing the gear and flaps were lowered; on flaring for landing the tower said go around but it was too late and the aircraft hit the runway and scrapped the keel doing no other damage to the aircraft. The nose wheel had deployed normally and was down and locked. The main wheels remained up. We jacked the plane up; lowered the gear and towed the plane in.during the flight I noticed the position lights were out on the gear and I thought I need to get this checked out. That should have been a warming to me. Also I should have checked hydraulic pressure before and after lowering the gear. After landing I noticed hydraulic pressure had dropped to zero and didn't come back up until I recycled the hydraulic switch. I should have visually checked the gear position by looking back under the wings which I normally do and check the nose wheel with the mounted mirror. I was rushed by setting up a tight base leg and final approach and didn't do it. Needless to say I'll be much more thorough on my pre-landing phase of flight.

Original NASA ASRS Text

Title: LA4-200 pilot reported a gear up landing when the main gear failed to extend during approach.

Narrative: This was an incident because the only damage to the aircraft was a scrapped keel. Lake Amphibian LA4-200. On approach to landing the gear and flaps were lowered; on flaring for landing the tower said go around but it was too late and the aircraft hit the runway and scrapped the keel doing no other damage to the aircraft. The nose wheel had deployed normally and was down and locked. The main wheels remained up. We jacked the plane up; lowered the gear and towed the plane in.During the flight I noticed the position lights were out on the gear and I thought I need to get this checked out. That should have been a warming to me. Also I should have checked hydraulic pressure before and after lowering the gear. After landing I noticed hydraulic pressure had dropped to zero and didn't come back up until I recycled the hydraulic switch. I should have visually checked the gear position by looking back under the wings which I normally do and check the nose wheel with the mounted mirror. I was rushed by setting up a tight base leg and final approach and didn't do it. Needless to say I'll be much more thorough on my pre-landing phase of flight.

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.