A330 L/G hydraulic isolation when V>280

[zonnair]

Hey there,

Please help me out.

The hydraulic supply for L/G operation is automatically isolated by closing a safety valve above 280kts. It is maintained closed until the L/G lever is moved down and the a/c speed is below 280kts.

Cruising at FL390, my speed turned out to be around 260kts. This is below the 280kts from the FCOM. If I select te lever down, I forfill the requirements to open the safety valve again. What will happen?

Is there a other safety feature installed, but not written about, or is it only a safety feature for unwanted gear extension at climb and descent, hence 280kts?

There is nowhere anything written that the max altitude of 21000' blocks the operation of the gear. So i disregard this.

Thanks in advanced,

ZNA