OPERATION AND INSTALLATION MANUAL
EN-1320
5.10 After Installing the Propellers AV-725 and AV-844 Ending in -R(P)
a) After installing the propeller on the engine, reinstall the beta feedback components into
the hub. See Section 5.6. Apply engine oil to the thread of the cover caps, as necessary.
b) Torque the cover caps to 10-12 Nm (7,5-9 ftlb).
c) Safety the cover caps with 0,81 mm (0.032 inch) stainless steel wire.
5.11 After Installing the Propeller Ending in -R(G)
a) Low Pitch Set up (Flight Idle) and positioning the blades at the start lock by using the
unfeather pump
After the propeller was installed with the blades in feathering position, use the unfeathering
pump to adjust low pitch blade angle (flight idle) according to the aircraft maintenance
manual and installation instruction. To use the unfeather pump, first install Beta Rod into
the propeller guide rod.
CAUTION: Do not shear off material of the O-ring no. A+B (see figure 5-10) during
installation of the beta tube. This will cause oil leakage.
Continue to use the pump for moving the prop into the start locks by lifting the power lever
over the flight idle gate and into full reverse until start lock latches engage. Then move
power lever back to flight idle position.
b) Positioning the Blades at the Start Lock by using the Start Lock Puller
If Beta Rod is already installed, remove Beta Rod from the propeller guide rod.
CAUTION: IF BETA-ROD IS NOT REMOVED BEFORE INSTALLING THE START LOCK
PULLER T-751, THE THREAD IN THE PROPELLER GUIDE ROD WILL BE
DAMAGED.
Install the start-lock puller T-751 to bring blades into the start-lock.
5.12 Installing the Carbon Block Assembly of Propellers Ending in -R(P) and -R(W)
a) Install the carbon block into the beta lever per the airframe manufacturer´s manual and/or
propeller governor manufacturer´s manual.
b) Install the carbon block into the beta ring. There are two types of the beta ring on Avia
propellers depending on model and installation, referred to as L-Type beta ring and U-Type
beta ring. They use different carbon blocks and have different installation requirements.
1) Fit the carbon block onto the L-Type beta ring with side clearance 0,15 to 0,18 mm
(0.006 to 0.007 inch) at new installation. Maximum clearance 0,4 mm (0.016 inch) is
acceptable. See figure 5-13.
Evenly sand the sides of carbon blocks with 600-grit sandpaper to achieve required
clearance, as necessary.
NOTE: Sanding the carbon block is applicable only to Avia original carbon block. It is
not applicable for the block used on Jihostroj LUN-series governor.
61-10-20
INSTALLATION AND OPERATION INSTRUCTION
Page 5-10
2017-10-06
