OPERATION AND INSTALLATION MANUAL
EN-1320
6.3. 900-HOUR / TWO-YEAR INSPECTION
Detailed inspection must be performed at 900-hour intervals of operation, not to exceed
24 calendar months. For possibility of flexible inspection schedule the hour interval may vary
plus/minus 30 flight hours.
1) Perform 300-hour/Annual inspection per procedure above in this chapter.
2) Inspect the blade shank and inside of the blade bushing.
NOTE: Not applicable for propeller AV-844.
a) Remove the spinner dome.
b) Disconnect the cables from the deicers, if applicable.
c) Check that position marks on the blade and blade bushing are well visible.
Only AV-725 and AV-803 series propellers
a) Remove the spinner dome.
b) Disconnect the electric de-icing cables (if de-icing system installed).
c) Observe visibility of position lines on the blade and bushing before removing the blades.
Use the sharp needle to renew the lines as necessary.
d) Remove the cotter pins, loose the clamp bolts and remove the blades from the bushing.
e) Thoroughly inspect the threads of all blades and blade bushings for corrosion. For further
operation is acceptable:
1 Very light corrosion marks in the blade thread.
2 Corrosion marks in the blade bushing thread not exceed 1/5 of circumference for first
and second thread (from outside) and 1/4 of circumference for other threads and
bushing bottom. Use special hand glass for inspection of the thread backside.
CAUTION: DO NOT REMOVE THE CORROSION MARKS IN THE BLADE THREAD
WITH FILE, GRINDER OR ANY OTHER TOOL. USE ONLY CLEAN CLOTH
TO WIPE THE SURFACE.
CAUTION: IN CASE OF STRONG AND/OR DEEP CORROSION, IF IT IS NOT
POSSIBLE TO REMOVE THE BLADE FROM THE BUSHING OR IN CASE
OF ANY DOUBT REMOVE THE PROPELLER FROM SERVICE AND
CONTACT AVIA PROPELLER.
f) Install the blades into the hub. Refer to chapter Installation and Operation Instruction.
61-10-20
INSPECTIONS
Page 6-3
2017-10-06
