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If the door seal pressure is set too high the pump will cycle at altitude.
This is because the the pressure can be set higher than the ambient pressure
(at altitude) times the pump's "compression ratio". The door seal pressure
can be adjusted by turning the small slotted screw in the center back of the
pressure switch. BTW, this adjustment is also available for the hydraulic
pressure switch.

One other tip. Attach an aquarium fine air stone to the inlet to the door
seal pump to act as a filter. Be sure to clean the stone with compressed air
before installing. Dust and dirt in the check valve will reduce system
performance. A properly operating system should cycle no more than once
every 5 minutes or so.

Regards
Brent Regan

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.