New and overhauled retractable-gear power packs, for the Sierra and Duchess, cost a small fortune. They are also very hard to come by. Is there anyplace that does legal overhauls on them? How about overhauls on fuel selector valves?
Search strings: hydraulic powerpack, hydraulic power pack, gear pump, hydraulic pump, landing gear pump, gear pump overhaul, fuel selector valve overhaul
In a word, yes. Aero Electrical in Wichita (316-943-6100) does this work for Beech all the time. They also rework the electrical landing gear assemblies for Bonanzas, and even for King Airs. Their overhaul price for BAC, on the two units used on our Model 24R and Model 76 planes (below), is $699 in October of 2006. Another repair option is Power Packs Plus: 775-322-8555, ‘Brian’; power packs and actuators; located in Nevada.
Updated May 29, 2009:
I recently learned that Aviation Group, 770-486-1666 also does hydraulic parts overhauls and fuel selector valve overhauls. This includes overhauls on the Sierra actuators (large and small), and the big shock absorbers used on the Beech Duchess main landing gear.
Gear pump part numbers:
105932B Hydraulic pump/power-pack (Prestolite 14V, all 14V 24R and 76)
HYH5001 Hydraulic pump/power-pack (Prestolite 28V), all 28V 24R and 76)
AvParts in Georgia (770-252-4646) will sometimes have an exchange-overhaul pump unit in stock, but not always.