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BETRIEBS- UND EINBAUANWEISUNG
OPERATION AND INSTALLATION MANUAL
HYDRAULISCHE VERSTELLPROPELLER
HYDRAULICALLY CONTROLLED
(CONSTANT SPEED PROPELLER)
Ausgabe 32: 14. Februar 2012
Revision 32: February 14, 2012
Der technische Inhalt dieses Dokuments ist aufgrund von
DOA Nr. EASA.21J.020 zugelassen.
The technical content of this document is approved under authority of
DOA No. EASA.21J.020.
ATA 61-05-04
E-504
REVERSIERBARE
REVERSIBLE
VARIABLE PITCH PROPELLER
MTV-5-( )-R (M)
MTV-6-( )-R (M)
MTV-9-( )-R (M)
MTV-12-( )-R (M)
MTV-14-( )-R (M)
MTV-15-( )-R(M)
MTV-16-( )-R (M)
MTV-21-( )-R(M)
MTV-22-( )-R (M)
MTV-25-( )-R (M)
MTV-27-( )-R (M)
EASA DE.21G.0008
EASA.21J.020
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Summarization of Contents
Warning
General Safety Precautions
Discusses risks, importance of propeller as a vital aircraft component, and potential failures.
Maintenance and Inspection Importance
Emphasizes proper maintenance and vigilance for early problem detection.
General Information
Statement of Purpose
Details the manual's scope for operation, installation, and maintenance of MT propellers.
Additional Available Publications
Lists other manuals required for repair and overhaul.
Component Life and Service Definitions
Overhaul Definition
Explains overhaul as a periodic process including disassembly, inspection, reconditioning, and reassembly.
Repair Definition
Defines repair as correction of minor damage, distinct from overhaul.
Propeller Design and Operation
Component Life (TSN/TSO)
Expresses component life in hours of service (TSN and TSO) and mentions life-limited parts.
Hydraulic Propeller Description
Describes MTV propellers designed for specific aircraft types and their constant speed operation.
Model Designation
Hub Designation
Explains the coding system for hub designation including letters for modifications.
Blade Designation
Details the coding system for blade designation including twist modifications and series numbers.
Performance Data
Flange Types
Lists different propeller flange types and their specifications.
Design and Operation Information
Hub Description
Details the hub construction from forged aluminum alloy with blade bearings.
Dual-Piston System
Explains the hydraulic pitch change mechanism using inner and outer pistons.
Blade Construction Details
Counterweights
Explains the function and identification of counterweights on blade roots.
Propeller Governor Description
Introduces new governors P-480 and P-9()() for the reverse system.
Governor Operation
Propeller De-icing System
Mentions electrical de-icing systems and their installation.
Installation and Operation Instructions
Reverse Feature Operation
Discusses requirements for proper reverse function and minimum pressure.
Engine Flange and Governor Installation
Covers propeller installation on flange type engines and governor mounting.
Reverse Mode Operation
Reverse Mode Warnings
Highlights operational limits (oil temp) and warnings for twin-engine aircraft.
Feathering
Feathering Procedure
Explains the procedure for feathering and unfeathering the propeller.
Operation
Governor and Propeller Performance
Discusses coordinated governor and propeller performance for constant speed.
Inspections
Daily Inspection
Lists checks for blades, spinner, cracks, and oil leaks.
SMA Application Inspection
Specific inspection requirements for SMA applications, noting no blade shake is allowed.
General Inspection Procedures
SMA Application Detailed Inspection
Comprehensive inspection checklist for SMA applications.
Blade Blisters and Delaminations
Erosion of Erosion Sheath
Explains erosion of the lacquer layer and potential damage to the FRP-coat.
Trailing Edge Damage Repair
Blade Root Shrinkage
Addresses cosmetic ripples from blade root shrinkage.
Lightning Strike Inspection and Reporting
De-Ice Boots Inspection and Repair
Covers checking de-ice boot bonding and repair procedures.
Erosion Sheath Impact Damage
Erosion Sheath Cracks and Repair
Specifies replacement for cracks in the erosion sheath.
Trouble Shooting
Excessive Propeller Braking Action
Addresses immediate action for excessive braking during approach due to stuck low pitch stop.
Improper RPM Adjustment
Discusses field adjustments for propeller and governor, stressing tachometer calibration.
Static RPM Too Low Troubleshooting
High RPM in Flight Troubleshooting
Addresses high RPM in flight, governor adjustment, and securing stops.
Sluggish RPM Change Troubleshooting
Surging RPM Troubleshooting
Lists causes for surging RPM, like trapped air or sludge, and remedies.
RPM Variations Between Flight Phases
RPM Decrease During Normal Operation
Investigates causes for RPM drop without lever input, like oil leaks or governor issues.
RPM Increase During Normal Operation
Slow Pitch Change Troubleshooting
Addresses slow pitch changes due to sticking blades or mechanism issues.
Oil Leakage Diagnosis and Remedy
Rough Engine Running Troubleshooting
Addresses rough engine running due to balance issues or restricted RPM ranges.
Slow Feathering Troubleshooting
Reverse Position Return Failure
Troubleshoots failure of blades to return to positive pitch after reverse.
Overhaul
Overhaul Intervals and Procedures
Defines overhaul intervals based on hours/months and calendar inspections.
Overhaul for Blade Damage
States overhaul is always required for foreign object blade damage.
Overspeed / Overtorque
Corrective Action for Overspeed/Overtorque
Explains corrective actions based on severity and duration of overspeed/overtorque.
No Action Required Cases
Outlines conditions where no maintenance is needed, verifying mechanical integrity.
Overspeed Inspection Procedures
Details general, hub, and blade inspections required after overspeed.
Aluminum Hub and Blade Inspections
Composite Blade Inspections and Torque Test
Procedures for composite blades, including tap inspection and torque tests.
Overspeed Overhaul Requirements
Scrapping Procedure for Overspeed
Outlines the process for scrapping a propeller deemed unairworthy after overspeed.
Maintenance
General Maintenance
States no special maintenance beyond inspections; allows use of common PU/acryl paints and epoxy resins.
Surface Finish and Blade Cleaning
Discusses PU lacquer/acryl lacquer finish, blade cleaning, and moisture prevention.
Hub Maintenance Requirements
States no frequent maintenance on the hub, with special lubricants for bearings.
Spinner Part Replacement
Blade Repair and Replacement
Outlines repair criteria for broken blades and replacement options.
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