EN-1320
OPERATION AND INSTALLATION MANUAL
Treat the repaired area to prevent corrosion. Apply chemical conversion coating and finish
coating as follows:
1) Wipe the surface with acetone or MEK.
2) Apply corrosion preventive coating Alodine 1200 or Alodine 1132 Touch-N-Prep to the bare
aluminum surface. Follow manufacturer´s directions.
3) Apply the finish coating. Refer below for approved aerosol paints:
Tempo A-150 Epoxy Black
Tempo A-151 Epoxy Gray
Tempo A-152 Epoxy White
CAUTION:
REPAIR PROCEDURES CAN ALTER PROPELLER BALANCE THAT MAY LEAD TO
EXCESSIVE VIBRATIONS OF THE PROPELLER IN OPERATION. THE DYNAMIC BALANCING
OF THE PROPELLER MAY BE NECESSARY. REFER TO DYNAMIC BALANCE SECTION IN
THIS MANUAL.
6.6. REPAIR OF BENT BLADES
CAUTION:
Do not attempt to “pre-straighten” a blade prior to delivery to an approved propeller repair
station. This will cause the blade to be scrapped by the repair station.
Repair of a bent blade or blades is considered a major repair. This type of repair must be
accomplished by an approved propeller repair station, and only within approved guidelines.
6.7. OVERSPEED / OVERTORQUE
Overspeed occurs if the propeller RPM exceeds the maximum RPM published in Type
Certificate Data Sheet of applicable propeller type.
Overtorque occurs when the engine load exceeds the limits established by the engine, propeller
and airframe manufacturer.
The corrective action is based on the severity and the duration of overspeed or overtorque for a
single event.
When a propeller installed on a turbine engine has an overspeed event, refer to figure 6-6 to
determine the corrective action to be taken.
When a propeller installed on a turbine engine has an overtorque event, refer to figure 6-7 to
determine the corrective action to be taken.
In case of overspeed and/or overtorque event resulted in inspection or overhaul is required to fill
out the report in below in this chapter and send it with propeller to manufacturer or authorized
service centre.
For engine mounted accessories (for example, governors, pumps, and propeller control units)
manufactured by Avia Propeller, any overspeed at a severity level and /or duration sufficient to
require at minimum a search inspection for the propeller, will require the accessory to be
disassembled and inspected in accordance with the applicable maintenance manual.
Regardless of the degree of damage, make a log book entry to document the overspeed event.
61-10-20
INSPECTIONS
Page 6-10
2017-10-06
