Official documentation
Just a quick update here with some official documentation straight from the source:
SERVICE LETTER AT2005-1
September 19, 2005
TO: Owners, Operators and Aero Technologies Service Centers
SUBJECT: Time Between Overhaul (TBO) Specifications
MODEL AFFECTED: All PCU5000 and PCU5000-X
SERVICE MANUAL AFFECTED: Maintenance / Overhaul Manual, AT1431299
This service information is to be added to the appropriate Aero Technologies Maintenance
Manual until the next manual revision is released.
PROPELLER CONTROL UNIT OVERHAUL AND STORAGE REQUIREMENTS
1) Overhaul Requirements ?
a) Seven calendar years or TBO of the engine on which it is installed, not to exceed 2400 hours whichever
comes first, after entering service (engine installation and operation).
2) Long Term Storage of Propeller Control Units ? The following is applicable to new and overhauled Propeller
Control Units prior to entering service (engine installation and operation):
a). Storage must be in a clean dry environment, preferably above ground level, in the original shipping
carton to minimize exposure to dirt and moisture.
b). If storage period exceeds two (2) years, before entering service perform the following inspection:
-). Inspect externally for damage and corrosion. If greater than five (5) years, reseal and test.
-). Test run the Propeller Control Unit on a Propeller Control Unit test bench to verify correct operation and to check for leakage. This must be accomplished by an FAA approved Repair Station in accordance with the Propeller Control Unit Maintenance
Manual.
3) Sudden stoppage, lightning strike, propeller impact or metal contamination ?
a) Overhaul before return to service.