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

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MT-Propeller MTV-28-2 Series Operation- And Installation And Maintenance Manual Download Page 7

 

Page 6 

Initial Revision 

2020-12-10 

 

 

ATA 61-07-19 

1. 

GENERAL 

 

1.1. 

Statement of purpose 

 
This publication provides operation, installation and line maintenance information for the MT 
hydraulically variable pitch propeller with dual acting system and reverse. 
 
In addition to the propeller assembly, the propeller governing (beta tube) system is addressed in this 
manual. 
 
Installation, removal, operation and troubleshooting data is included in this publication. 
Also the hovercraft manufacturer's manuals should be used in addition to this information. 
 

1.2. 

Additional Available Publications 

 
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 
Fax: +49-9429-8432 
 
E-mail:  [email protected] 
Internet:  www.mt-propeller.com 

 
 
 
 
 
 
 
 
 
 
 

 

 

Summary of Contents for 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 10th 2020 DE 21G 0008 EASA 21J 020...

Page 2: ...ces of failures particularly of the fatigue type It is essential that the propeller be properly maintained according to the recommended service procedures and a close watch be exercised to detect impe...

Page 3: ...le of contents Table of contents 2 List of effective pages 3 List of revisions 4 1 General 6 2 Model designation 10 3 Typical Blade Design 11 4 Design and operation information 12 5 Installation and o...

Page 4: ...2020 12 10 25 2020 12 10 6 2020 12 10 26 2020 12 10 7 2020 12 10 27 2020 12 10 8 2020 12 10 28 2020 12 10 9 2020 12 10 29 2020 12 10 10 2020 12 10 30 2020 12 10 11 2020 12 10 31 2020 12 10 12 2020 12...

Page 5: ...Page 4 Initial Revision 2020 12 10 ATA 61 07 19 LIST OF REVISIONS Revision No Revision Date Pages Description 1 2020 12 10 All pages Initial Revision...

Page 6: ...nd should be complied promptly These are sent to dealers distributors and latest registered owners Service Letters deal with products improvements and service hints pertaining to the propeller and its...

Page 7: ...a is included in this publication Also the hovercraft manufacturer s manuals should be used in addition to this information 1 2 Additional Available Publications In addition to this manual the followi...

Page 8: ...ich employs a governing device to maintain a selected engine RPM Crack Irregularly shaped separation within a material sometimes visible as a narrow opening at the surface Delamination Internal separa...

Page 9: ...A non rotating propeller FOD does not require an overhaul it only needs a blade repair or a blade exchange Blade damage with a non rotating propeller cannot damage the propeller hub and therefore does...

Page 10: ...an overhaul 1 5 3 Component Life Component life is expressed in terms of total hours of service TSN Time Since New and in terms of hours of service since overhaul TSO Time Since Overhaul Both referenc...

Page 11: ...everse System Hovercraft 8 R Reversing System installed 7 F Feathering System installed 6 Letter Designation Counterweights C Counterweights mounted for pitch change moments towards high pitch feather...

Page 12: ...Moment Towards High Pitch CR Pitch Change Pin for Reversing Pitching Moment Towards High Pitch CFR Pitch Change Pin for Feathering Reversing Pitching Moments Towards High Pitch The complete propeller...

Page 13: ...ield for better repair replacement or shipping The inner part of the hub is filled with oil on the front is the dual acting cylinder mounted for the pressure oil this arrangement allows a simple and l...

Page 14: ...composite Spinner rear support plate and the mid support plate are parts of the hub The spinner front support dome is mounted to the drive shaft adapter The dome is mounted on the supports by means o...

Page 15: ...the two interfaces rotor side hydraulic actuator side must be 0 05 The alignments tolerances must be 0 2 mm 0 008 in If the distance between the engine propeller drive shaft to the adjusting unit is...

Page 16: ...Page 15 Initial Revision 2020 12 10 ATA 61 07 19 Drawing MTV 28 2 AZ R H P 1582 1...

Page 17: ...Page 16 Initial Revision 2020 12 10 ATA 61 07 19 Drawing Beta rod P 1587 X...

Page 18: ...r overhauled propeller may leave grease on the blades and inner surface of the spinner dome This is normal and does not imply a continuing grease leakage Remove any grease on the blades or inner surfa...

Page 19: ...e that metal chips or other impurities are present on the threads fretting can occur during blade installation and the ferrules may be scrapped Clean the threads thoroughly e g with a brass brush Lubr...

Page 20: ...Page 19 Initial Revision 2020 12 10 ATA 61 07 19 Figure 5 Cleaned and degreased surfaces Figure 6 Cleaned surface no polishing allowed no greasing allowed...

Page 21: ...resonance body Listen carefully for abnormal sounds during the installation of the blade into the outer ferrule In case any odd sounds appear screw the blade out check the thread for possible damage...

Page 22: ...f the blade Record the pin position used for each blade in accordance to the hub serial number Tighten the stop nut 6 3 of the clamp screw 6 1 with 210 220 N 155 162 ft lbs of torque after the anti ro...

Page 23: ...prevents moisture and contaminating dirt entering the blade thread between inner and outer blade ferrule see Figure 11 Only use original O rings approved by manufacturer Before the pin installation s...

Page 24: ...the housing 1 1 and mount it onto the cartridge aft end cap torque all screws with 8 2 9 4 Nm 6 6 9 ft lbs Secure all screws with safety wire After assembly of the spacer actuator insert the beta rod...

Page 25: ...Page 24 Initial Revision 2020 12 10 ATA 61 07 19...

Page 26: ...check blade angle 40 2 To minimize internal leakage use the adjusting rod to move the beta tube additional 2 mm 0 08 in out of the adjusting unit Neutral pitch at a blade angle of 2 need to be determi...

Page 27: ...ve grease on the blades and inner surface of the spinner dome This is normal and does not imply a continuing grease leakage Remove any grease on the blades or inner surface of the spinner dome by usin...

Page 28: ...CHECK THE BLADE SHAKE IN CHORD DIRECTION SEE FIGURE 13 Check the relative movement of the blade preload nut to the hub during the blade shake test No visible play is allowed If the check shows results...

Page 29: ...ot damage the preload bearing Adjusting unit and beta rod Check for corrosion on adjusting unit and beta rod In case corrosion is found remove corrosion by polishing with abrasive paper and apply stic...

Page 30: ...pair see Service Letters SL 32 and SL 32 2 Attention The aerodynamic properties of the airfoil must not be disturbed when performing a repair Apply a layer of lacquer to protect the repaired spot agai...

Page 31: ...parts is defined in the applicable service manual 6 5 Overspeed Overtorque When a propeller has an overspeed event refer to the engine overspeed limits Figure 16 to determine the corrective action to...

Page 32: ...ponents Aluminum Hub Visually inspect the blade retention area of the blade socket Composite Blades Perform a thorough visual and coin tap inspection see Figure 17 of the exposed portion of each blade...

Page 33: ...ect 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...

Page 34: ...ated inside the hub and are not exposed to the environment The hub is filled with 10 l 2 6 gal HLP 100 oil for lubrication which does not need to be refilled In the hub two oil filler bores provide th...

Page 35: ...leak does not spray more than 18 cm 7 in on the blade surface from the blade root outside the blade ferrule in 5 hours of operation it is defined as minor and should be only monitored Continued grease...

Page 36: ...e labeled with a decal on blade no 1 to inform service station personnel that the existing balance weight configuration may not be correct for static balance 7 2 16 Register number and location of sta...

Page 37: ...Page 36 Initial Revision 2020 12 10 ATA 61 07 19 Figure 20 balance weight B 486...

Page 38: ...Page 37 Initial Revision 2020 12 10 ATA 61 07 19 Figure 21 Boot B 683 6...

Page 39: ...the electric actuator the blade retention system needs to be inspected Contact manufacturer 8 3 Surging RPM Cause 1 Residual oil 2 Abrupt movement of propeller or throttle control 3 Instrumental erro...

Page 40: ...OT APPEAR AT ONCE AND GETS WORSE OVER TIME IT SHOULD BE OBSERVED 3 Contact manufacturer 4 Repair propeller 8 6 Oil leakage visible outside or hidden inside Cause Damaged seals Remedy Replace gaskets o...

Page 41: ...4 months after new assembly or overhaul and proper storage provided the TBO automatically starts after this 24 months up to maximal 84 months of calendar time 9 4 In case the propeller is stored for l...

Page 42: ...a padded support that supports the entire length of the propeller If applicable remove the plastic dust cover cap from the propeller mounting flange 9 10 Lifting To lift the propeller pick up the pro...

Page 43: ...Page 42 Initial Revision 2020 12 10 ATA 61 07 19 12 PROPELLER DRAWING MTV 28 2 AZ R H Drawing No P 1582...

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