EN-1320
OPERATION AND INSTALLATION MANUAL
5.18
Only models AV-( )-E( )
AFTER THE GROUND RUN OF THE ENGINE, INSPECT THE PROPELLER FLANGE SIDE
FOR ANY TRACES OF ANTI-SEIZE COMPOUND ON THE BRUSH BLOCK, SLIP RING,
BETA RING, ETC. THOROUGHLY WIPE BEFORE FLIGHT.
CAUTION: ANI-SEIZE COMPOUND ON THE PARTS WILL CAUSE DAMAGE TO THE PARTS
IN OPERATION.
5.19
Perform test flight in accordance with description in the flight manual.
5.20
Operation
Propeller, governor and beta-system are selected as a result of tests. The governor must allow
constant speed as well as reverse and feathering.
At all power and rpm settings the rpm must be automatically controlled and changed in the
entire speed range. Range as mentioned in the flight manual.
In case of failure of oil pressure, the propeller automatically goes into feathering.
CAUTION: MOVE POWER LEVER AND RPM LEVER ALWAYS SLOWLY TO AVOID
OVERSPEED.
5.21 Pre-flight check
Before Take-off, check the propeller pitch change according to the Aircraft Flight Manual. If it is
possible and allowed push the pitch change two times to bleed the system.
If necessary, use the warm air to remove ice from the spinnerdome. Spinnerdome surface can
be heated to max.85°C (185°F) for metal spinnerdome, max.60°C (140°F) for composite
spinnerdome.
5.22 In Flight:
Power as well as rpm setting according to the Aircraft Flight Manual.
5.23 Feathering
All propellers in this manual have feathering which must be reached in every flight condition.
Free turbines as the PT6A-( ) Walter M601-Series and GE H-Series achieve feathering during
engine shut-down.
The TPE-331-( ) engines achieve feathering only in case of emergency, because these engines
have a separate feathering-valve and not the governors, as usual.
5.24 Reverse modus
For these propellers reverse is initiated by pulling back the power lever over the flight idle gate.
The power lever controls the beta-valve on the governor. By pulling the power lever further
back, the beta valve moves. Because of that the rpm and the negative blade angle increase
and negative thrust is produced. At the same time a yellow lamp inside the cockpit must
illuminate which informs the pilots that the propeller is in beta mode (reverse). Because of
alternate designs from aircraft manufacturers, there are different safety provisions possible to
avoid unintended reverse during flight.
The Aircraft Flight Manual as well as the Maintenance Manual describe the systems more
detailed.
61-10-20
INSTALLATION AND OPERATION INSTRUCTION
Page 5-15
2017-10-06
