MT-Propeller MTV-28-2 Series Operation- And Installation And Maintenance Manual

Reversible hydraulically controlled variable pitch propeller

Hide thumbs

Table Of Contents

Table of Contents

Quick Links

ATA 61-07-19

(E-3719)

OPERATION- AND INSTALLATION AND MAINTENANCE

MANUAL

REVERSIBLE HYDRAULICALLY CONTROLLED

VARIABLE PITCH PROPELLER

MTV-28-2-( )-R(H)

Release date: December 10

, 2020

DE.21G.0008

EASA.21J.020

Table of Contents

Need help?

Do you have a question about the MTV-28-2 Series and is the answer not in the manual?

Questions and answers

Summary of Contents for MT-Propeller MTV-28-2 Series

Page 1 ATA 61-07-19 (E-3719) OPERATION- AND INSTALLATION AND MAINTENANCE MANUAL REVERSIBLE HYDRAULICALLY CONTROLLED VARIABLE PITCH PROPELLER MTV-28-2-( )-R(H) Release date: December 10 , 2020 DE.21G.0008 EASA.21J.020...
Page 2 It therefore deserves the care and maintenance called for in this manual. Please give it your attention, especially the section dealing with inspections and checks. Thank you for choosing a MT-Propeller. Properly maintained it will give you many years of reliable service.
Page 3: Table Of Contents
ATA 61-07-19 Page 2 Initial Revision 2020-12-10 PERATION AND NSTALLATION ANUAL EVERSIBLE YDRAULICALLY ONTROLLED ARIABLE ITCH ROPELLER MTV-28-2-AZ-R(H) Table of contents Table of contents ..............................2 List of effective pages ..............................3 List of revisions ................................4 General ................................6 Model designation ............................
Page 4: List Of Effective Pages
ATA 61-07-19 Page 3 Initial Revision 2020-12-10 LIST OF EFFECTIVE PAGES Page Date Page Date Page Date 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10 2020-12-10...
Page 5: List Of Revisions
ATA 61-07-19 Page 4 Initial Revision 2020-12-10 LIST OF REVISIONS Revision Revision Pages Description Date 2020-12-10 All pages Initial Revision...
Page 6 Every owner should stay in close contact with his MT-Propeller dealer or distributor and authorized MT-Propeller service shop to obtain the latest information pertaining his propeller and its installation. MT-Propeller takes a continuing interest in having the owner get the most efficient use of his propeller and keeping it in the best mechanical condition.
Page 7: General
In addition to this manual the following applicable publications should be used for repair and overhaul: OVERHAUL MANUAL ATA-61-12-392 / E-2392 Consult the manufacturer’s manuals for the propeller governor and de-icing (see vendor publications). For MT-Propeller service literature contact: MT-Propeller Entwicklung GmbH Flugplatzstraße 1 D-94348 Atting Germany Tel.: +49-9429-9409-0...
Page 8 ATA 61-07-19 Page 7 Initial Revision 2020-12-10 1.3. Abbreviations Time Between Overhaul Total Time Time Since Overhaul Revolutions per Minute Society of Automotive Engineers Unified National Fine Thread Series TCDS Type Certificate Data Sheet Polyurethane Manifold Pressure Airplane Flight Manual Inch per Second Federal Aviation Administration Instruction for Continued Airworthiness...
Page 9 ATA 61-07-19 Page 8 Initial Revision 2020-12-10 1.5. Definition of Component Life and Service 1.5.1. Overhaul Overhaul is a periodic process and contains the following items: ➢ Disassembly ➢ Inspection of Parts ➢ Reconditioning of Parts ➢ Reassembly The overhaul interval is based on hours of service (operating time) or on calendar time. Attention: In case of blade damage by a foreign object an overhaul is always required in case that the blade damage is beyond the limitation of an in-field repair.
Page 10 ATA 61-07-19 Page 9 Initial Revision 2020-12-10 1.5.2. Repair Repair is correction of minor damage caused during normal operation. It is done on an irregular basis, as required. See Service Letters SL32 and SL32-2, each latest issue for additional information. A repair does not include an overhaul.
Page 11: Model Designation
ATA 61-07-19 Page 10 Initial Revision 2020-12-10 MODEL DESIGNATION 2.1. Hub-designation - AZ - Capital letter = Modifications which restrict or exclude interchangeability Small letter = Modifications which not affecting interchangeability. = Reverse System Hovercraft = Reversing System installed = Feathering System installed Letter Designation Counterweights = Counterweights mounted for pitch change moments towards high pitch / feathering...
Page 12: Typical Blade Design
ATA 61-07-19 Page 11 Initial Revision 2020-12-10 2.2. Blade Designation Small Letter = Modifications which do not affect interchangeability of blade sets. Capital Letter = Modifications which restrict or exclude interchangeability of blade sets. Consecutive Number of Basic Type (including Aerodynamic Design Diameter in cm Sense of Rotation Blank...
Page 13: Design And Operation Information
ATA 61-07-19 Page 12 Initial Revision 2020-12-10 DESIGN AND OPERATION INFORMATION The variable pitch propeller consists of the following main groups: ➢ ➢ Pitch Change Mechanism ➢ Blades ➢ Counterweights ➢ Spinner Beta Valve ➢ 4.1. The one-piece hub is made from forged and milled aluminum alloy with the outer surface shot-peened and anodized.
Page 14 ATA 61-07-19 Page 13 Initial Revision 2020-12-10 4.3. Blade The used blades are of natural composite design, using high compressed wood in the root and lightweight wood in the remaining body. Three foam inserts are installed per blade. Carbon fiber material covers the entire blade surface and is painted with epoxy/polyurethane lacquer. The outer section is protected against erosion by a bonded nickel erosion sheath.
Page 15 ATA 61-07-19 Page 14 Initial Revision 2020-12-10 The pressure line is on top of the beta rod P-1587-X, on the drain line the actuator mount assembly is located. An electrical push/pull actuator is connected to the beta tube, which provides a direct blade angle feedback in operation.
Page 16 ATA 61-07-19 Page 15 Initial Revision 2020-12-10 Drawing MTV-28-2-AZ-R(H) P-1582-1...
Page 17 ATA 61-07-19 Page 16 Initial Revision 2020-12-10 Drawing Beta rod P-1587-X...
Page 18: Installation And Operation Instruction
ATA 61-07-19 Page 17 Initial Revision 2020-12-10 INSTALLATION AND OPERATION INSTRUCTION 5.1. General The MTV-28-2-AZ-R(H) is designed only suitable for an engine flange with 18x 9/16”-18 UNF on a Ø230 mm PCD interface. The code for the flange type and size can be seen from the model designation (see chapter 2).
Page 19 ATA 61-07-19 Page 18 Initial Revision 2020-12-10 5.3.1. Installation of in-field removable blades Warning: Never polish the outer diameter on the inner blade ferrule or the inner diameter on the outer blade ferrule since the surfaces are special treated for durability, see Figure 3. If polished, the surface is losing the hardness and may create fretting.
Page 20 ATA 61-07-19 Page 19 Initial Revision 2020-12-10 Figure 5: Cleaned and degreased surfaces Figure 6: Cleaned surface, no polishing allowed, no greasing allowed!
Page 21 ATA 61-07-19 Page 20 Initial Revision 2020-12-10 WARNING: DO NOT GREASE THE CYLINDER BLADE FERRULE OUTER/INNER DIAMETER, OTHERWISE THE FRICTION WILL NOT BE HIGH ENOUGH TO STOP THE BLADE FROM ROTATION DURING OPERATION. Screw the blade with the thread of the inner ferrule completely into the outer blade ferrule (CW); 2 mechanics are required.
Page 22 ATA 61-07-19 Page 21 Initial Revision 2020-12-10 Attention: After drilling a new pin bore the edge of the bore in the inner blade ferrule needs to be de-burred before rotating the blade out from the outer ferrule. To do so rotate the blade slightly and carefully CW and CCW in order to get access to the bore edge of the inner blade ferrule.
Page 23 ATA 61-07-19 Page 22 Initial Revision 2020-12-10 Apply silicone seal RTV 109 or similar onto the contact line between blade clamp and preload nut, see Figure 10. Finally apply sealant on the bolt and stop nut which attach the counterweight to the blade clamp. Figure 10: Apply silicone between blade clamp and preload nut Attention: The O-ring 2.50 prevents moisture and contaminating dirt entering the blade thread between...
Page 24 ATA 61-07-19 Page 23 Initial Revision 2020-12-10 5.4. Installation of the propeller and the beta tube 5.4.1. Install the propeller carefully onto the engine flange and stub shaft. Observe the position of the 2 index pins 2.46 for the drive shaft. Attention Never use the stop nuts 2.45 to pull the propeller onto the flange! Manual pushing only!
Page 25 ATA 61-07-19 Page 24 Initial Revision 2020-12-10...
Page 26 ATA 61-07-19 Page 25 Initial Revision 2020-12-10 5.5. Adjusting Mechanical high pitch stops and reverse stops are adjusted during manufacturing, according to the requirement of the engine / application. Hydraulic low pitch can only be adjusted via the beta rod setup. 5.5.1.
Page 27: Inspections
ATA 61-07-19 Page 26 Initial Revision 2020-12-10 INSPECTIONS 6.1. Pre-operation inspection Before each operation of the propeller inspect the condition of the blades and spinner: No blade shake is allowed! No critical cracks are allowed in the blades. Metal erosion sheath is not allowed to be loose. PU-strip must be properly attached.
Page 28 No visible play is allowed! If the check shows results not complying with these requirements contact the service department of MT-Propeller. Inspect the visible condition of the hub and parts for cracks, corrosion or deterioration. Check all safety means to be intact.
Page 29 Cracks in the painted surface are allowed as long as no moisture can enter the blade core. Blisters or delaminations up to 645 mm² (1 in²) are permissible. In case of questionable conditions please contact the service department of MT-Propeller. Also see Service Letter SL-32 and SL-32-2.
Page 30 ATA 61-07-19 Page 29 Initial Revision 2020-12-10 Figure 15: black sealer between the blade and ferrule Check that the black sealer which is sealing the blade with the inner ferrule is not damaged, see Figure 15. If a damaged seal is obvious it has to be repaired acc. to Service Letter SL-32 in order no moisture can intrude the blade body and ferrule.
Page 31 In case an overspeed inspection or overhaul due to overspeed is required also engine mounted accessories manufactured by MT-Propeller (e.g. governor, pump, propeller control unit) need to be disassembled in order to be inspected in accordance with the applicable maintenance manual.
Page 32 ATA 61-07-19 Page 31 Initial Revision 2020-12-10 6.5.2. Overspeed Inspection An overspeed inspection requires the disassembly of the propeller in accordance with the appropriate propeller overhaul manual and performance of the following inspections: General Visually inspect for signs of abnormal wear and/or damage. Evidence of wear and/or damage should be further evaluated using the inspection criteria from the appropriate propeller or blade overhaul manual.
Page 33 Frequently inspect areas prone to corrosion, remove the corrosion and re-grease as applicable. In case of doubts regarding corrosion please send pictures of the affected areas to the technical support of MT-Propeller (techsupport@mt-propeller.com) for information and evaluation. NOTE: N CASE THE PROPELLER IS MAINTAINED AND INSPECTED ACCORDING TO...
Page 34: Maintenance
ATA 61-07-19 Page 33 Initial Revision 2020-12-10 MAINTENANCE 7.1. There is no special maintenance schedule for these propellers beyond the usual inspections as per chapter 6. For the repair of minor damages in the blade surface and edges, automotive material such as PU or Acryl paint and Epoxy resin can be used, see service letter SL-32 and SL-32-2.
Page 35 ATA 61-07-19 Page 34 Initial Revision 2020-12-10 7.2. Dynamic balance 7.2.1. Overview Dynamic balance is accomplished by measuring the amount and location of the dynamic imbalance, using accurate means of measuring. After the balancing the remaining imbalance should be lower than 0.2 ips. Follow the instructions from the equipment manufacturers for dynamic balance.
Page 36 ATA 61-07-19 Page 35 Initial Revision 2020-12-10 7.2.11. As dynamic balance weights on the front plate use B-486 or similar. 7.2.12. Maximum balance weight capacity per location must not exceed 180 g. 7.2.13. Weights are to be installed using aircraft quality 1/4’’-28 bolts. 7.2.14.
Page 37 ATA 61-07-19 Page 36 Initial Revision 2020-12-10 Figure 20: balance weight B-486...
Page 38 ATA 61-07-19 Page 37 Initial Revision 2020-12-10 Figure 21: Boot B-683-6...
Page 39: Trouble Shooting
ATA 61-07-19 Page 38 Initial Revision 2020-12-10 TROUBLE SHOOTING 8.1. Blade shake in FWD and AFT direction Cause: Blade bearing loose Remedy: No movement at all is allowed on MTV-28-2-AZ-R(H). In case of movement return propeller to the manufacturer or any approved repair station. 8.2.
Page 40 ATA 61-07-19 Page 39 Initial Revision 2020-12-10 8.5. Extremely slow pitch change or no pitch change on ground Cause: 1. Blocked oil line. 2. Residual oil in propeller piston. 3. Damaged pitch change mechanism. 4. Corrosion in the blade bearings. Remedy: 1.
Page 41: Shipping And Storage
ATA 61-07-19 Page 40 Initial Revision 2020-12-10 SHIPPING AND STORAGE 9.1. For any shipment of the propeller use original container. If this is not possible it is mandatory to fix the propeller at the blades and the hub in a way to avoid damage during transport. Furthermore it is recommended to return all accessories and parts together with the propeller when returning the propeller.
Page 42: Special Tools
ATA 61-07-19 Page 41 Initial Revision 2020-12-10 9.8. Acceptance Check Examine the exterior of the shipping container for signs of shipping damage, especially at the box ends around each blade. A hole, tear or crushed appearance at the end of the box (at the propeller tips) may indicate the propeller was dropped during shipment, possibly damaging the blades.
Page 43: Propeller Drawing
ATA 61-07-19 Page 42 Initial Revision 2020-12-10 PROPELLER DRAWING MTV-28-2-AZ-R(H) Drawing No. P-1582...

This manual is also suitable for:

Mtv-28-2-r series Mtv-28-2-rh series Mtv-28-2-az-r Mtv-28-2-az-rh