[lubomir]

Hello everyone,
I have had a P337H with the call sign N330LC since 1980. For the last two weeks, I have had a issue with the landing gear extension sequence. I would like to describe the problem and hope you can help me, please.

On Thursday, I had a flight from the maintenance shop to my home airport. During maintenance, they checked the jacks 20 times, and the landing gear worked without any issue.
During the test flight, I performed four touch and-go, each time with the landing gear extended and retracted. No issue , the landing gear worked great.

Upon arrival at my home airport, I again extended the landing gear perfectly before landing and landed safely. The system worked great.

Yesterday, I was doing a training flight, but after takeoff, the landing gear did not retract. The system behaved as follows:
lever up, hydraulic pump running, landing gear door opened, but landing gear did not retract, green light still on, pump running with difficulty in the next phase! The circuit switch tripped. Then I reset the circuit switch I returned the lever to its gear down position and the landing gear door back closed normally. It seems to me that the landing gear cannot be released.

The accumulator has 500 PSI
Hydraulic fluid - Full
No visible fluid leaks anywhere
No visible mechanical damage to the chassis anywhere

Thank you for your help and advice.
Lubomir