# TCDS P14BO: MT-Propeller Entwicklung GmbH - Type: Type certificate data sheet - Status: Current - Holder: MT-Propeller Entwicklung GmbH - Revision: 4 - Revised: March 15, 2007 - Product: Propeller - Certification basis: Part 21, Part 35 - Data sheet PDF: https://openairdocs.org/files/sha256/a4/fd/a4fd1b5d9444177c6cbab2869e64a4240954f8275ab90c3677a745debbd65f4a - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/635BB724E3232FF1862572A00055468C.0001 - Page: https://openairdocs.org/tcds/P14BO ## Models (2) As the data sheet lists them. - MTV-25-1-( ) - MTV-25-2-( ) ## What the data sheet says From the PDF's text layer, line by line; tables lose their columns. The PDF is the record. ```text PAGE 1 2 3 4 5 REV. 4 4 4 4 4 U.S. DEPARTMENT OF TRANSPORTATION FEDERAL AVIATION ADMINISTRATION TYPE CERTIFICATE DATA SHEET TCDS NUMBER: P14BO REVISION: 4 MT-PROPELLER COMPANY MODEL: MTV-25-( ) March 15, 2007 Propellers of models described herein conforming with this data sheet (which is part of Type Certificate No. P14BO) and other approved data on file with the Federal Aviation Administration, meet the minimum standards for use in certificated aircraft in accordance with pertinent aircraft data sheets and applicable portions of the Federal Aviation Regulations provided they are installed, operated, and maintained as prescribed by the approved manufacturer’s manual and other approved instructions. TYPE CERTIFICATE (TC) HOLDER: MT-Propeller Entwicklung GmbH Airport Straubing-Wallmühle D-94348 Atting G e r m a n y TYPE: Hydraulic constant speed with reversing and feathering pitch feature. ENGINE SHAFT: See Note 1 of this TCDS. HUB MATERIAL: Aluminum alloy BLADE MATERIAL: Laminated wood composite structure, epoxy-fiber glass cover, with leading edge and erosion protection. HUBS: See Note 1 of this TCDS. NUMBER OF BLADES: 5 (five) DESIGN SERIES: MTV-25-1-( ), MTV-25-2-( ) Hub-Type MTV-25 See Note 1 BLADES (See Notes 2 & 6) MAXIMUM CONTINUOUS HP (kW) RPM HP (kW) RPM Nominal Diameter Max Min inch (cm) inch (cm) BLADE TWIST *) min max APPROXIMATE WEIGHT **), ***) lbs. (kg) ( )-3, ( )-4, ( )-5, ( )-6, ( )-7, ( )-8, ( )-9, ( )-12, ( )-16, ( )-23, ( )-28, ( )-31, ( )-49, ( )-51, 185 (138) 2850 185 (138) 2850 67.0 170 55.0 (140) 5 50 48.5 (22) ( )-106, ( )-112, ( )-122, ( )-125, ( )-312 350 (261) 2700 350 (261) 2700 67.0 170 55.0 (140) 5 50 48.5 (22) *) The limits of blade twist are defined to be between .20 and 1.00 blade radius. **) Propellers with the option “Feather” are 7.7lbs (3.3kg) heavier. ***) Propellers with the option “Feather and Reverse” are 17.6 lbs. (8 kg) heavier. TCDS P14BO PAGE 2 CERTIFICATION BASIS The U.S. certif ication basis determined under Section 21.29 of the FAR and Bilateral Airworthiness Agreement between the United States and the Federal Republic of Germany is FAR 35, effective February 1, 1965, Amendments 35-1 to 35-6, inclusive. Equivalent level of safety findings for 35.21 for Model MTV-25 which restricts the model to airship installations. Luftfahrt-Bundesamt (LBA) originally type certificated this propeller under its type certificate Number 32.130/97. The FAA validated this product under U.S. Type Certificate Number P14BO. Effective September 28, 2003, the European Aviation Safety Agency (EASA) began oversight of this product on behalf of the Federal Republic of Germany. TC (IMPORT) NO: LBA-Data Sheet No. 32.130/97: MTV-25-1 Issue 2, dated August 26, 1997, MTV-25-1 Issue 3 dated June 20, 2001, and MTV-25-2 Issue 1, dated June 20, 2001. TC APPLICATION DATE: August 8, 1996 TC ISSUED July 17, 1997, Revised Septem ber 26, 1997, July 31, 2001, and September 7, 2001 IMPORT To be considered eligible for installa tion on U.S. registered aircraft, each propeller to REQUIREMENTS: be exported to the Un ited States shall be accompanied by a Certificate of Airworthiness for export endorsed by the LBA on behalf of the European Community which contains the following language: (1) This propeller conforms to its United States type design P14BO and is in a condition for safe operation. (2) This propeller has been subjected by the manufacturer to a final operational check and is in a proper state of airworthiness. Reference FAR Section 21.500 which provides for the airworthiness acceptance of aircraft engines or propellers manufactured outside the U.S. for which a U.S. type certificate has been issued. Additional guidance is contained in FAA Advisory Circular 21-23, Airworthiness Certification of Civil Aircraft, Engines, Propellers and Related Products, imported into the United States. TCDS P14BO PAGE 3 NOTES NOTE 1: HUB MODEL DESIGNATION: MT V -25 - D - ( ) - ( ) - ( ) - ( ) - R = Reversing, Blank no reverse possible Minor changes, not affecting interchangeability ( ) Reversing Method, M=System Muhlbauer, A=System Allison F = Feathering possible, Blank no feather poss ible C = Design Configuration number Flange Type * Counterw eights for oil pressure to decrease pitch 25 = Model No. V = Variable pitch propeller MT = MT - Propeller Entw ickicklung GmbH - ( ) * Flange: B = AS-127-D, SAE No. 2 mod 1/2” mounting bolts C = AS-127-D, SAE No. 2 mod 7/16” mounting bolts D = ARP 502 TCDS P14BO PAGE 4 NOTE 2: Blade Model Designation: Sense of rotation (viewed in flight direction) Blank: righthand tractor RD: righthand pusher L: lefthand tractor LD: lefthand pusher ( ) 170 - 06 - ( ) Propeller diameter in cm Number of blade design, contains construction and aerodynamic data. Small letter, indicating deviation of blade tw i st from standard values according to manufacturer. ( ) Position of pitch change pin Blank: Position for pitch change forces to decrease pitch C: Position for pitch change forces to increase pitch CR: Position for reve rse (pitch change forces to increase pitch) CF: Position for feather (pitch change forces in direction to increase pitch) CFR: P osition for feather and reverse (pitch change forces in direction to increase pitch) NOTE 3: Pitch Control: Pitch control is accomplished by a standard governor or by the MT-Propeller Hydraulic Propeller Governor Installation, P-480-() for the reversing option -R(M). The P-480-() is a single acting pump governor, but dual pressure system design enables the hydraulically variable pitch MT propellers to operate with reverse capability. P-480-() also incorporates feathering capability. NOTE 4: (a) Model incorporates feathering and unfeathering features by means of counterweights and springs with governor operation. (b) Model also incorporates reversi ng feature: System-R(M) by P-480-( ), System-R(A) by standard Allison beta system. NOTE 5: Right & left hand models: A version of the approved model with opposite hand rotation is approved at the same rating and diameter limitations. NOTE 6: Interchangeability: Not applicable TCDS P14BO PAGE 5 NOTE 7: Accessories: (a) Propeller Spinners: Acco rding to FAA-approved list published in MT-Propeller Service Bulletin No. 13 for MTV-25 propeller. (b) Propeller Governors: According to FAA-approved List published in MT-Propeller Service Bulletin No. 14 for MTV-25 propeller. (c) Deicing Systems: According to FAA-approved List published in MT-Propeller Service Bulletin No. 15 for MTV-25 propeller. (d) Adapter flange per MT drawing A-847-A. NOTE 8: Shank Fairings: Not applicable NOTE 9: Special Limits: Propeller Model MTV-25-1 and MTV-25-2 cannot be installed on airplanes without special FAA review. These propellers are limited to airship installati ons and operation. Additional installations must be evaluated for inadvertent in-fli ght reverse operation or failures. Therefore these installations must be reviewed and approved by FAA, Boston Aircraft Certification Office NOTE 10: Special Notes: a) Aircraft installations must be approved as part of the aircraft type certificate and demonstrate compliance with the applicabl e aircraft airworthiness requirements. b) All MTV-25 propellers are to be operated with in the limits of MT-Propeller Operation and Installation Manual No. E-124, E-504, E-508 and E-610 and adhere to the TBO-limits shown in Service Bulletin No. 1(). c) Propeller Maintenance, on overhaul, and airw orthiness limitations shall be accomplished in accordance with MT Propeller Overhaul Manual E-220, E-519, E-520 and E-680 latest revision. NOTE 11: Service Information: Each of the documents listed below must state that it is approved by the European Aviation Safety Agency (EASA) or – for approvals made before September 28, 2003 – by the LBA. Any such documents are accepted by the FAA and are considered FAA approved. • Service bulletins, • Structural repair manuals, • Vendor manuals, • Aircraft flight manuals, and • Overhaul and maintenance manuals. …..END….. ``` ## ADs (1, in force first) - [AD 2006-05-05](https://openairdocs.org/ad/2006-05-05) (historical): Propeller blades · MT-Propeller Entwicklung MTV-1-( ), MTV-12-B, MTV-12-C and 17 more. Effective Apr 10, 2006 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.