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BETRIEBS- UND EINBAUANWEISUNG
OPERATION AND INSTALLATION MANUAL
REVERSIERBARE HYDRAULISCHE VERSTELLPROPELLER
REVERSIBLE HYDRAULICALLY CONTROLLED
VARIABLE PITCH PROPELLER (CONSTANT SPEED PROPELLER)
Ausgabe 42: 15.07.2021
Revision 42: July 15
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
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)
MTV-37-( )-R (M)
MTV-47-( )-R (M)
th
, 2021
EASA DE.21G.0008
EASA.21J.020
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Summarization of Contents
General Information
Statement of Purpose
Details the manual's purpose: operation, installation, and maintenance information for MT propellers.
Additional Available Publications
Lists other publications required for propeller repair and overhaul.
Vendor Publications
Lists technical documents from third-party manufacturers for additional information.
Abbreviations
Provides a list of abbreviations and their full meanings used in the manual.
Terms and Definitions
Defines key technical terms related to propellers and their operation.
Component Life and Service
Overhaul
Details the periodic process of disassembly, inspection, repair, and reassembly for propellers.
Repair
Describes correction of minor damage and its distinction from overhaul procedures.
Component Life
Explains component life in terms of Total Time Since New (TSN) and Time Since Overhaul (TSO).
Propeller Design and Operation
Hub
Details the construction and function of the propeller hub, including blade bearings.
Dual-Piston System
Explains the function and components of the dual-piston pitch change system.
Blade Construction
Details the wood-composite construction, Epoxy-GFK coating, and protection of the propeller blade.
Counterweights
Explains the purpose and identification of counterweights on propeller blades.
Spinner
Describes the construction and mounting of the propeller spinner.
Propeller Governor
Details the function and types of governors used with the reverse system.
Model Designation
Hub Designation
Explains the coding system for propeller hubs and their modifications.
Blade Designation
Explains the designation system for propeller blades and their features.
Complete Propeller Designation
Combines hub and blade designations for the full propeller identification.
Aircraft-Engine Combination
Defines how propellers are specified for specific aircraft-engine combinations.
Installation and Operation Instructions
Propeller Installation Suitability
Specifies that propellers are suitable for flange-type engines and refers to designation codes.
Governor Installation
Details the correct installation of the governor and wiring precautions.
Magnetic Valve Wiring Installation
Provides instructions for wiring the magnetic valve, including safety steps and optional components.
Trouble Shooting
Improper RPM
Addresses issues with incorrect propeller or governor RPM settings.
Static RPM Too Low
Diagnoses and resolves low static RPM by checking governor or propeller limits.
RPM In Flight Too High
Troubleshooting steps for high RPM during flight and governor adjustment.
Blade Shake
Identifies and provides remedies for fore and aft movement of the blade.
Fore and Aft Movement (Blade Shake)
Details the cause (loose bearing) and remedy for blade shake.
SMA Application Blade Shake
Specific inspection procedures for SMA applications, including blade shake and angle.
Blade Angle Play
Explains cause and remedy for excessive blade angle play.
Sluggish RPM Change on Ground
Troubleshoots slow RPM changes on the ground due to cold oil or friction.
Surging RPM
Addresses causes of RPM fluctuations (surging) like air or sludge in the system.
RPM Variations Between Flight Phases
Explains RPM variations during ascent, cruise, and descent and their causes.
RPM Decrease During Normal Operation
Diagnoses RPM decrease without lever input, due to oil leaks or high temperature.
RPM Increase During Normal Operation
Addresses unexpected RPM increases during normal operation, potentially governor related.
Slow or No Pitch Change on Ground
Diagnoses issues with slow or non-existent pitch changes on the ground.
Slow or No Reversing
Troubleshoots slow or absent reverse function due to high temps, leakage, or switch issues.
Slow Feathering
Addresses slow feathering times and potential causes like stiff blades or governor issues.
Propeller Does Not Return From Reverse
Diagnoses issues with the propeller failing to return from reverse, possibly due to valve sticking.
Dual Valve Governor Timer Adjustment
Explains timer adjustment for the out-of-reverse magnetic valve on dual valve governors.
Oil Leakage
Diagnoses and remedies oil leaks, focusing on gasket replacement or propeller repair.
Rough Running Engine
Addresses rough engine running, potentially due to balance issues or restricted RPM ranges.
Inspections
Daily and Preflight Inspections
Details daily and preflight checks for blades, spinner, and other components.
Grease Leakages
Describes how to inspect and handle grease leaks on blades and spinner.
General Inspections (Section 6.2)
Covers general inspections, spinner checks, blade shake, and angle play.
Spinner and Blade Condition Checks
Covers spinner condition, blade shake, angle play, and SMA specific checks.
SMA Application Inspections
Specific inspection procedures for SMA applications, including blade shake and angle.
Blade Visual Inspection
Details visual inspection of blades for cracks in fiberglass and erosion sheath.
Erosion Sheath Damage Assessment
Details possible damage along the erosion sheath like dents, cracks, and hollow spots.
Blade Blisters and Delaminations
Guidance on identifying and repairing blisters, delaminations, and trailing edge damage.
Lightning Strike and De-Ice Boots
Procedures for inspecting blades after lightning strikes and checking de-ice boot integrity.
PU Erosion Protection Tape
Instructions for replacing damaged PU-tape on the blade's inner portion.
Special Inspections
Details special inspections required for unconventional installations or new combinations.
Overhaul Procedures
Defines overhaul intervals and requirements, emphasizing foreign object damage.
Overspeed and Overtorque Limits
Defines conditions for overspeed/overtorque and corrective actions based on duration.
Corrective Actions for Overspeed/Overtorque
Details corrective actions based on severity and duration of overspeed or overtorque events.
Overspeed Inspection Procedures
Outlines disassembly and inspection requirements for propellers after an overspeed event.
Overhaul as Corrective Action
Specifies that overhaul is the corrective action for overspeed/overtorque.
Scrapping Propeller
Defines scrapping as the corrective action when a propeller is deemed unairworthy.
Maintenance
General Maintenance
States no special maintenance beyond inspections; minor damage repair using PU/acryl paint.
Surface Finish and Blade Cleaning
Describes surface finish and cleaning procedures, emphasizing moisture prevention.
Hub Maintenance
Notes no frequent maintenance on the hub as moving parts are internal.
Spinner Parts Repair
States repair of spinner parts is not permissible; cracked parts must be replaced.
Blade Repair and Replacement
Details conditions for blade repair and replacement, and hub airworthiness after ground strike.
Dynamic Balance
Explains the process of dynamic balancing for propellers.
Dynamic Balance Overview
Details the objective of dynamic balancing and required accuracy.
Balance Measurement and Accuracy
Specifies using accurate measuring devices and target imbalance levels.
Follow Equipment Manufacturer Instructions
Emphasizes following instructions from dynamic balancing equipment manufacturers.
Action for High Dynamic Imbalance
Requires propeller removal and static rebalancing if dynamic imbalance exceeds limits.
Inspection Procedures Before Balancing
Details visual inspection of the propeller assembly before dynamic balancing.
Visual Inspection Before Balancing
Details pre-balancing visual inspection, including grease leaks and spinner condition.
Record Balance Weight Locations
Requires recording static and dynamic balance weight locations.
Placement on Aluminum Spinners
Recommends radial placement of weights on un-drilled aluminum spinner bulkheads.
Radial Location of Balance Weights
Specifies the radial location for balance weights on spinner bulkheads.
Acceptable Drilling for Balance Weights
Allows drilling for AN3 type bolts with self-locking nuts for weight installation.
Avoid Interference with Aircraft Components
Ensures balance weight locations do not interfere with airframe, deice, or engine components.
Mounting Weights Without Spinner
Describes mounting weights in hub threads when no spinner is installed.
Attaching Balance Weights for Dynamic Balancing
Details where and how to attach dynamic balance weights on rear spinner bulkheads.
Removing Dynamic Balance Weights
Explains how removing dynamic weights returns the propeller to static balance.
Approved Balance Weights
Specifies the use of stainless or plated steel washers as balance weights.
Maximum Weight per Location
Sets the maximum weight limit per location and how to split if more is needed.
Installing Balance Weights
Details the type of screws and quality standards for installing weights.
Protrusion of Balance Weight Screws
Specifies the required screw protrusion through self-locking nuts.
Decal for Dynamically Balanced Propellers
Requires a decal on blade #1 for dynamically balanced propellers.
Record Balance Weight Changes
Mandates recording dynamic and static weight changes in the Propeller Logbook.
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