After putting CSH back together there seems to be a never ending list of small faults.

Once the master is switched on, the Hydraulic Under Carriage Pump stays on, it appears that either the pressure limit switch has failed or it could be one of the following, after testing the emergency U/C level in flight;

1. A leak in the emergency U/C seal, allowing high pressure to leak back into the system

2. The high pressure switch has failed and the cutout does not work

or,

3. The high pressure valve has failed and the return oil is simply recirculating.

Any quick suggestions?

Stewart Carter
VH-CSH