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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
1.0 GENERAL
1.0.1 Statement of Purpose
Explains the manual's focus on operation, installation, and maintenance.
1.0.2 Additional Available Publications
Lists other publications needed for repair and overhaul.
1.1 Definition of Component Life and Service
1.1.1 Overhaul
Defines overhaul as a periodic process with disassembly, inspection, reconditioning, and reassembly.
1.1.2 Repair
Describes repair as correction of minor damage, done on an irregular basis as required.
4.0 DESIGN AND OPERATION INFORMATION
4.1 Hub
Describes the hub construction from forged/milled aluminum alloy with blade bearings.
Dual-Piston System
Explains the hydraulic pitch change mechanism with inner and outer pistons.
4.2 Blade
Describes wood-composite blades with epoxy fiberglass cover and metal leading edge protection.
4.3 Counterweights
Explains counterweights attached to blade roots for reverse and feathering.
4.4 Spinner
Describes the spinner dome made from fiber reinforced composite or aluminum alloy.
4.5 Propeller Governor
Details the P-480 and P-9()() governors for the reverse system.
4.6 Propeller de-icing
Mentions electrical de-icing systems bonded onto blades.
2.0 MODEL DESIGNATION
2.1 Hub-designation
Explains the coding system for hub designation, including modifications and flange types.
2.2 Blade designation
2.3 The complete propeller designation
Combines hub and blade designations for the full propeller identification.
2.4 The propeller for a certain aircraft-engine combination
Defines propeller by hub, blade, and spinner combination; refers to logbook for settings.
5.0 INSTALLATION AND OPERATION INSTRUCTION
5.2.1 Installation Instruction for the wire harness of the magnetic valve
Provides instructions for wiring the magnetic valve, including safety steps.
For Airplanes with Cam Box
Explains reverse activation using a microswitch in the Cam Box.
For Aiplanes with „Guarded Switch" No. 4
Details reverse activation using a guarded switch, including RPM reduction.
5.3 Electrical propeller deicing
Discusses optional electrical de-icing systems and installation requirements.
5.15 Low and high pitch stops
Explains how low and high pitch stops are adjusted during manufacture.
5.15.1 Reverse System Test
Outlines the procedure for testing the reverse system, including beta function and thrust.
5.15.2 Check piston lock function
Describes how to check the piston lock function by observing RPM increase.
5.15.3 Check of the Startlock
Details checking the startlock, especially for seaplanes, during engine shutdown and restart.
5.16 After the ground runs, check for oil leaks
Specifies post-ground run checks for oil leaks, blade shake, and de-ice system condition.
5.19 Startcheck
Instructs to cycle the propeller at least twice before flight for system flushing.
5.19.1. Taxing
Details reverse system checks during taxing, including RPM and annunciator light.
Reverse System Check
Outlines steps for checking the reverse system, including beta function and amber light.
Piston Lock (centrifugal safety lock) check
Describes testing the piston lock by observing RPM increase and verifying switch status.
5.20 Feathering
Provides instructions for achieving feathering and unfeathering the propeller.
5.21 Reverse Modus
Explains the operation and limitations of the reverse mode for ground use.
5.22 Propeller De-Icing
Advises checking de-ice system and warns against operation without spinner.
6.0 INSPECTIONS
6.1 Daily Inspection
Lists daily inspection items for blades and spinner, including shake and angle play.
6.1.1 SMA Application
Specifies SMA application requirements for blade shake (not allowed) and angle play.
6.2 Inspections
6.2.1
Details inspection procedures for spinner, blade shake, and blade angle play.
6.2.1.1 SMA – Application
Details SMA application inspections for spinner, blade shake, angle play, and hub components.
6.2.2 Check blades
Instructs to check blades for cracks in fiberglass cover and erosion sheath.
Possible cracks along the metal erosion sheath
Illustrates and describes possible cracks along the metal erosion sheath.
6.3 In case of any impact
Provides guidelines for inspecting and repairing impacts on the erosion sheath.
6.4 In case of impacts in the erosion sheath
Details procedures for impacts potentially penetrating the erosion sheath.
6.5 If there are any cracks
Specifies replacement requirements for cracks in the erosion sheath.
6.6 If any hollow and debonded spots exist
Provides guidelines for inspecting and managing hollow/debonded spots on the erosion sheath.
6.7 The erosion mentioned under item 6.2.3.5
Explains erosion of the lacquer layer and its implications for blade integrity.
6.8 Blisters and delaminations
6.8.1 Crunched Trailing Edges
Provides repair instructions for crunched trailing edges using 5-minute Epoxy.
6.8.2 Blade Root Shrinkage
Describes cosmetic ripples from blade root shrinkage corrected during overhaul.
6.9 Lightning Strike
6.9.1. De-Ice Boots
Details checking de-ice boot bonding and repair procedures, including sealing and painting.
6.13 Overspeed / Overtorque
6.13.1 Corrective Action
States corrective action is based on severity and duration of overspeed/overtorque event.
6.13.2 No Action Necessary
Notes that no maintenance is needed if overspeed wasn't caused by a mechanical problem.
6.13.3 Overspeed Inspection
Requires propeller disassembly and inspection following overspeed events.
6.13.4 Overhaul
States that overhaul must be performed according to the appropriate manual following overspeed/overtorque.
6.13.5 Scrap
Requires propeller removal from service if scrapping is the corrective action.
7.0 MAINTENANCE
7.1 There is no special maintenance schedule
States no special maintenance beyond inspections, allowing common PU/acryl paints and Epoxy resins for minor repairs.
7.2 The surface finish is made with PU lacquer
Describes the PU/acryl lacquer surface finish and cleaning recommendations.
7.3 There are no frequent maintenance works required on the hub
Notes no frequent maintenance on the hub, with special lubricants for bearings and pitch mechanism.
7.4 Repair of spinner parts is not permissible
Prohibits spinner part repairs; damaged domes/plates must be replaced.
7.5 Broken tips and damaged blades can be repaired
Details conditions for blade repair by the manufacturer and hub airworthiness after ground strike.
7.6 DYNAMIC BALANCE
7.6.1 Overview
General overview of dynamic balancing, required accuracy, and adherence to manufacturer instructions.
7.6.1.1 Dynamic balance is accomplished
Explains the goal of dynamic balance is to achieve below 0.2 ips remaining imbalance.
7.6.1.2 Follow the instructions
Emphasizes following equipment manufacturer instructions for dynamic balancing.
7.6.1.3 If the dynamic imbalance is bigger than 1,2 ips
States that propellers with imbalance > 1.2 ips must be removed and statically rebalanced.
7.6.2 INSPECTION PROCEDURES PRIOR TO BALANCING
Details procedures for inspecting the propeller assembly before dynamic balancing.
7.6.2.1 Visually inspect the propeller assembly
Requires visual inspection of the propeller assembly after reinstallation before dynamic balancing.
7.6.2.2 NOTE: The First run-up
Notes that grease on blades/spinner during first run-up is normal and must be removed with mild solvent.
7.6.2.3 Prior to dynamic balance record the number
Instructs to record the number and location of static balance weights before dynamic balancing.
7.6.2.4 The radial location should be outboard of the slip ring
Specifies the radial location for bulkhead attachment of the spinner dome.
7.6.2.5 Drilling holes for use with the AN3-() type bolts
States that drilling holes for AN3 bolts with self-locking nuts is acceptable.
7.6.2.6 All hole/balance weight locations must take into consideration
Emphasizes avoiding interference with airframe, deice, or engine components when placing weights.
7.6.2.7 In case no spinner is installed
Instructs to mount balance weights in hub threads if no spinner is installed.
7.6.3 PLACEMENT OF BALANCE WEIGHTS FOR DYNAMIC BALANCE
Provides guidance on the preferred methods for attaching dynamic balance weights.
7.6.3.1 The preferred method of attachment
Recommends attaching dynamic balance weights to the spinner bulkhead.
7.6.3.2 Subsequent removal of the dynamic balance weights
Explains that removing dynamic weights returns the propeller to its original static balance.
7.6.3.3 Use only stainless or plated steel washers
Specifies using only stainless or plated steel washers as dynamic balance weights.
7.6.3.4 Do not exceed maximum weight per location of 32 g
Sets a maximum weight limit per location for balance weights.
7.6.3.5 Weights are to be installed using aircraft quality 10-32 inch screws
Specifies the type of screws to be used for installing balance weights.
7.6.3.6 Balance weight screws attached to the spinner bulkheads must protrude
Details the required protrusion of balance weight screws through self-locking nuts.
7.6.3.7 All propellers which have been dynamically balanced must install a decal on blade no. 1
Requires a decal on blade 1 for dynamically balanced propellers to indicate weight configuration.
7.6.3.8 Record number and location of dynamic balance weights
Instructs to log the position and number of static and dynamic balance weights.
8.0 TROUBLE SHOOTING
8.1 Improper rpm
Addresses issues with incorrect static, flight, or reverse RPM.
8.1.1 Static rpm too low
Guides on diagnosing and adjusting static RPM when it is too low, involving propeller pitch stops.
8.1.2 Rpm in flight too high
Explains how to adjust flight RPM using the governor and the importance of securing the stop screw.
8.2 Blade shake
8.2.1 Fore and aft movement
Details checking and correcting blade bearing looseness if shake exceeds 3 mm.
8.2.1.1 SMA Application
Specifies that blade shake is not allowed for SMA applications and requires factory adjustment.
9.0 SHIPPING AND STORAGE
9.1 For any shipment of the propeller use original container
Recommends using original packaging for propeller shipment, ensuring blades and hub are fixed to prevent damage.
9.2 In case of returning the propeller it is furthermore recommended
Suggests returning all accessories with the propeller for inspection.
9.3 The TBO starts immediately after the initial installation
Clarifies that TBO begins upon initial installation and is not interrupted by removals.
9.4 If the propeller is stored for longer than 24 months
Mandates disassembly and seal replacement for propellers stored over 24 months to reset calendar time TBO.
9.5 Long-term storage could require additional preservation
Advises additional preservation for long-term storage, protecting metal parts and avoiding moisture ingress into wooden blades.
9.6 If the propeller is stored or transported in corrosive environment
Recommends coating visible metal parts with light engine oil for corrosive environments.
9.7 If the propeller is delivered in a wooden shipping box
Advises opening the shipping box upon receipt to prevent chemical corrosion of propeller parts.
9.8 Acceptance Checking
Instructs on visually inspecting the shipping container and propeller components for damage.
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