last update March 08, 2017

Service Letters

No. Content Date of Revision
List
(.pdf, 242k)
List of Service Letter
download this list as .pdf file
March 07, 2017
SL1
(.pdf, 12k)
Replacing of lag screws part No. A-550-85 and part No. A-550-65 by lag screws part No. A-983-85 and part No. A-983-65.
Affected Propellers: All Constant Speed Propellers.
May 12, 1999
SL2
Aeroshell No. 5 is used instead of Aeroshell No. 6.
Affected Propellers: All Constant Speed Propellers. Replaced by Service Letter No. 21
May 12, 1999
SL3
(.pdf, 10k)
Modification of the pitch change pin location.
Affected Propellers: All Constant Speed Propellers.
May 12, 1999
SL4
Introduction of DF O-Rings.
Affected Propellers: All Constant Speed Propellers.
Replaced by Service Letter No. 14
May 12, 1999
SL5
(.pdf, 9k)
Replacing of screws part no. MS 35265-65/ A-1635-70 and washers part no. AN 960-10.
Affected Propellers: All Hydraulic Constant Speed Propellers.
May 12, 1999
SL6A
(.pdf, 9k)
Modification of Counterweights A-597-B.
Affected Propellers: MTV-9-B-C/CL250-27, MTV-9-B-C/CL260-27
May 12, 1999
SL7A
(.pdf, 19k)
Replacement of screws M3x10 by M3x12.
Affected Propellers: All Electric Constant Speed Propellers
March 05, 2003
SL8
(.pdf, 9k)
Introduction of Resin A 20 + Hardener B20
Affected Propellers: All natural composite blades
Nov 29, 1999
SL9A
(.pdf, 9k)
Replacing of blade bearings A-317, A-233, A-004
Affected Propellers: All variable pitch propellers
Aug 27, 2001
SL10
(.pdf, 16k)
Teardown inspection at 1/3 TBO.
Affected Propellers: All Variable Pitch Aerobatic Propellers.
March 01, 2000
SL11
(.pdf, 9k)
Installation of standard electric pitch change motor
Affected Propellers: All Electric Constant Speed Propellers.
April 05, 2000
12
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SL13
(.pdf, 8k)
Painting of Counterweights
Affected Propellers: All Counterweighted Propellers
July 11, 2002
SL14D
(.pdf, 14k)
New blade seals in MT-Propeller constant speed propellers.
Affected Propellers: All MTV Constant Speed Propellers.
March 20, 2003
SL15
(.pdf, 106k)
New counterweights
Affected Propellers: All MT-Propellers with the new counterweights installed
Nov 27, 2000
SL16
(.pdf, 9k)
Erosion Sheath on fixed pitch propeller
Affected Propellers: All Fixed Pitch Propellers with a Diameter > 69.3 inch
Feb 01, 2001
SL17C
(.pdf, 13k)
Replacement of MTV-9/ -12/ -14/ -15 hub (serial numbers up to 97xxx).
Affected Propellers: MTV-9, MTV-12, MTV-14, MTV-15
March 09, 2011
SL18 R1
(.pdf, 70k)
Additional Installation of PTFE back up ring
Affected Propellers: MTV-9-( ), MTV-12, MTV-14-( )
July 29, 2015
SL19
(.pdf, 9k)
New Control Unit P-120-A (beginning with serial no. WA01-XXX)
Affected Propellers: All aeroplanes and motor gliders with an electrical variable pitch MT-Propeller with a Control Unit P-120-A.
Oct 24, 2001
SL20A
(.pdf, 72k)
Replacement of the front plate of MTV-9-/MTV-12-/MTV-14-/MTV-16-( ) with new hub
Affected Propellers: MTV-9/ -12/ -14/ -16, standard, with feather and reverse (M) (P).
Feb 19, 2009
SL21B
(.pdf, 21k)
Replacement of Aeroshell 5 by MT 2 Propeller Grease including improvement of viscosity Nov 04, 2002
SL22K
(.pdf, 71k)
Leading edge installation
MT-Propeller Constant Speed Propeller Blades of type:
C188-18b, C190-18b, C193-18b, C198-25, ()225-37a, ()180-59, ()180-59b, ()183-17e (-A), ()183-59, ()183-59b, ()188-59b, CFLR250-55b
Affected Propellers: MT-Propeller Constant Speed Propeller
March 09, 2011
SL23C
(.pdf, 14k)
Grease Leakage Problem.
Affected Propellers: MTV-12-B/180-17 installed on Diamond DA40 with Lyc. IO-360-M1A.
March 21, 2003
SL24A
(.pdf, 14k)
Torque of Check Nuts and Slotted Nuts.
Affected Propellers: All hydraulic MTV-Propellers.
March 07, 2003
SL25
(.pdf, 20k)
Replacement of return spring, part no. A-085 by new return spring part no. D-389-K
Affected Propeller: MTV-6( )
Jan 28, 2004
SL26A
(.pdf, 72k)
Front Plates
Affected Propeller: All hydraulic MTV-Propeller (except dual acting Walter Reverse Systems -R(W)) manufatured between Augst 1999 up to October 2004 (serial no. 99xxx to 04xxx)
Nov 12, 2004
SL27B
(.pdf, 67k)
Cure date and shelf live of MT-Propeller O-Rings
Affected Propeller: All hydraulic and electric constant speed MT-Propeller.
Nov 09, 2010
SL28
(.pdf, 36k)
Installation of oil cooler scoop P/N 763-8035-1/MT on Cessna U206 , TU206G (with Soloy Turbine PAC, FAA STC SA 3353 NM) equipped with 5-blade MTV-5-1-E-C-F-R(M)/CFR220-54 propeller
Affected Propeller: MTV-5-1-E-C-F-R(M)/CFR220-54
July 03, 2006
SL29R5
(.pdf, 51k)
Leading Edge Installation
Installed on Husky A1-( ) Propeller MTV-15-B/210-58 and MTV-15-B/205-58 and ACA Scout MTV-15-B/203-58 as well as MTV-15-C/200-50p and MTV-20-C/200-50p
Affected Propeller: MTV-15-B/210-58 and MTV-15-B/205-58 installed on Husky A1 and ACA Scout MTV-15-B/203-58 and MTV-15-C/200-50p and MTV-20-C/200-50p5
August 21, 2015
SL30D
(.pdf, 54k)
Fluid De-Ice Boot Installation on MT-Propeller Composite Blades June 18, 2009
SL31A
(.pdf, 88k)
MTV-9-B-S/198-58B Rework and Modification of Blade Preload-Nut A-1368 and Blade Ferrule A-1367 Feb 12, 2008
SL32 R3
(.pdf, 1.9MB)
MT-, MTE and MTV-Propellers with natural Composite Blades
In-Field-Repairs
Feb 23, 2017
SL32-1
(.pdf, 980kb)
MT-, MTE and MTV-Propellers with natural Composite Blades
Painting
Nov 11, 2013
SL33A
(.pdf, 71k)
Shrouded Propeller Installation (if not enough clearance between blade tip and shroud) Jan 20, 2009
SL34
(.pdf, 116k)
MTV-9-B-S/198-58B installed on Cessna 182 (SMA-Application) with Propeller hub A-926-2-( ) Oct 20, 2008
SL35A
(.pdf, 63k)
All MT-Constant Speed Propellers
Cleaning of Parts and Hubs by Glass / Plastic Media Blasting
March 13, 2009
SL36
(.pdf, 90k)
Rework of Hub Inserts to Newest Technical Standard during next Overhaul and/or Repair
MTV-16-1-N-C-F-R(P)
MTV-27-1-N-C-F-R(P)
MTV-27-2-N-C-F-R(P)
May 07, 2009
SL37A
Propeller Governors for Electric Control P-857 / P-877 series
Correct Adjustment of Travel of Speed Change Nut
Dec 02, 2011
SL38 R2
(.pdf, 100k)
Procedure for the Installation of the Preload System P-890
Affected Proeller: MTV-12, MTV-14, MTV-22
Sept 09, 2014
SL39 Start Lock Springs
Exchange of Start Lock Springs, Identification of Springs
(for special customer only)
Oct 07, 2009
SL40 Propeller Governors for Electric Control P-853, P-877 series
Installation of the Flexible Max Speed Stop Modification “D”
(for special customer only)
Nov 10, 2009
SL41 R1
(.pdf, 140k)
Optional Replacement of Return Spring Part N. A-880 by new Return Spring Part No. A-1772 and A-1771-1
Affected Propeller: MTV-12-( )-C-F
June 23, 2015
SL42
(.pdf, 460k)
Propeller Designation System March 21, 2010
SL43
(.pdf, 90k)
Cure Date and Shelf Life of MT-2 Propeller Grease May 09, 2011
SL44 R1 (Internal)
SL45 R1 (Internal)
SL46
(.pdf, 40k)
Fittings installed on Unfeathering Accumulator P-893-( )/P-905-( ) on all Diamond DA42 with Thielert/Austro/Lycoming engines September 28, 2012
SL47
(.pdf, 40k)
Blade Seal Installation during Propeller Assembly January 14, 2013
SL48
(.pdf, 40k)
i.p.
SL49 R6
(.pdf, 1,5MB)
Re-Positioning of de-ice cables to improve long time wear. December 15, 2016
SL50 R1
(.pdf, 749kb)
Pitch change pin inspection during next overhaul or repair. June 23, 2015
SL51 R1
(.pdf, 53kb)
Installation of Protective Erosion Tape on De-Ice Boots
Affected Propeller: MTV-27-1-E-C-F-R(G)/CFRL250-55b
Affected Aircraft: DO228 series
March 17, 2016
SL51-1
(.pdf, 60kb)
Installation of Protective Erosion Tape on De-Ice Boots
Pilatus PC 12 / KingAir 200 series / SA-227-AT/-AC/-BC/-TT/SA-226-TB / Metro 3 / Merlin 4
Affected Propeller:
MTV-27-1-N-C-F-R(P)/CFR260-65a
MTV-27-1-N-C-F-R(P)/CFR225-55f
MTV-27-1-N-C-F-R(P)/CFR/L250-103
January 19, 2017
SL52 R1
Optimum Installation of the Christen 801 Series Inverted Oil System in
Combination with MT-Propellers.
Affected Propeller: MTV-12-B-C/C183-17e
Affected Aircraft: Grob G115E
For special customer only
May 29, 2013
SL52-1 R1
(.pdf, 53kb)
Installation of P-447 Accumulator in Combination with MT-Propellers
Affected Propeller: MTV-12-B-C/C183-17e
Installed per EASA STC 10043263
July 30, 2015
SL52-2
(.pdf, 53kb)
Removal of Inner Propeller Spring on Counterweighted MT-Propeller
Affected Propeller: MTV-12-B-C/C183-17e
Installed per EASA STC 10043263
November 07, 2013
SL53 R4
(.pdf, 53kb)
Modification of Fluid Deice System
Affected Propeller:MTV-14-D/195-30b
Affected Aircraft: Cirrus SR22-( ) with Spinner Assy P-320-2
August 28, 2015
SL54
(.pdf, 53kb)
Replacement of parts during overhaul or repair
Affected Propeller: MTV-27-1-N-C-F-R(G)-J with blade type CFR285-82 or CFRL 285-82
Affected Aircraft: Jetstream 41
July 25, 2013
SL55 R4
(.pdf, 53kb)
Installation of Protective Polyurethane Tape on MTV-5-()/-27-() Hovercraft blades
Affected Propeller: MTV-5-1-W-C-R(H)/CRLD199-117
MTV-27-1-X-C-R(H)/CRLD218-121d
MTV-27-1-V-C-R(H)/CRLD258-121b
Affected Vehicle: Griffon Hovercraft
(This service Letter overwrites 55A)
July 03, 2015
SL56
(.pdf, 53kb)
General Information for MT-Propeller trained Mechanics Possible Action against Dynamic Vibration on MT-Propeller
Affected Propeller: MTV-27-( ), MTV-25-( ), MTV-16-( ), MTV-5-( )
November 15, 2013
SL57 R1
(.pdf, 53kb)
Affected Propeller: MTV-27-1-N-C-F-R(G)-J/ CFR285-82 / CFRL285-82
with spinner assembly P-1152-( )
installed on Jetstream 41
Manufactured / overhauled or repaired before 12/2013.
March 17, 2015
SL58
(.pdf, 176kb)
Removal of inner propeller spring on counterweighted MT-Propeller
Affected Propeller: MTV-14-B-C/C190-17 on EXTRA 300 series, Cap 231/EX/232 Series
August 07, 2014
SL59
(.pdf, 176kb)
RCounterweight body crack inspection (Magnetic Particle Inspection)
Affected propeller: All counterweighted variable Pitch MT-Propeller
February 19, 2015
SL60
(.pdf, 176kb)
Moficiation of Counterweight Body A-1496-(C )Y( )
Affected Propeller:
MTV-16-1-N-C-F-R(P)/ CFRLD265-65
MTV-16-1-N-C-F-R(P)/ CFRLD280-65
June 11, 2015
SL61
(.pdf, 488kb)
Additional Secure of Motor Screws on Electric Motor P-820-( ) August 04, 2015
SL62
(.pdf, 653kb)
Modification of the Starter Gear installed on Lycoming Engine for Electrically Controlled Variable Pitch Propeller Systems August 20, 2015
SL63
(.pdf, 653kb)
Inspection of Beta Valve P-846 / Prop Front O-Ring for possible Oil Leak Installed on RR250 engines
Affected Propellers:
MTV-5-1-D-C-F-R(A)/CFR210-56
November 02, 2016
SL64
(.pdf, 653kb)
Alternative Positioning of MT-Propeller Identification Label Affected Propellers:
All MTV-Propeller which have no identification label on the propeller blade
February 2, 2017
SL65
(.pdf, 1.9MB)
Inner bearing Halves Inspection (Visual Inspection)
Affected Propellers:
All Hydraulically and Electrically Controlled Variable Pitch MT-Propeller As sharp edges were found on the split line of the inner bearing halves.
March 07, 2017