# Hoffmann Propeller Service Bulletin 057: No revision named - Rights: © Hoffmann Propeller. Filed by the FAA in regulations.gov docket FAA-2022-0980; AD 2022-21-13 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Hoffmann Propeller Service Bulletin 057](https://openairdocs.org/service-documents/hoffmann-propeller/sb-057.md) - Title as filed: Hoffmann Propeller SB 057 Revision C - Pages: 4 - PDF: https://openairdocs.org/files/sha256/46/89/4689db471cb2c9773f86d15d1e218e437c112ec3a068aa21cf744ab92b26bc11 - Page: https://openairdocs.org/service-documents/hoffmann-propeller/sb-057/file/4689db471cb2 ## Text Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 Service Bulletin SB057 C QS-FO 89B Nr. Ausgabe/ no. edition Referenziert in/ referenced in Seite / Page QS-FO 89B BH Part 3 (DOH) 1 of 4 Procedure of tightening blade nuts 1 General Effectivity: All Hoffmann Variable Pitch Propeller Reason: Unification of the blade nut tightening Description: Description of proper procedure for tightening the blade nuts. 2 Revision History Revision Description/Reason for Revision Date A Initial Issue, replacement of service instruction B2.23 2022-02-02 B Option that other torque wrenches can be added on request 2022-02-08 C Blade nut torque added 2022-02-22 3 Description Manpower: None Material – Cost and Availability: PV-parts available at Hoffmann Propeller / Wrenches available at Hoffmann Propeller or in the public stores Tooling: - Blade spanner according to table 1. - Adaptor according to table 1. - Torque wrenches according to table 2. Weight and Balance: N/A Electrical Load Data: N/A Software Accomplishment Summary: N/A References: None Other Publications: Component and Maintenance Manuals as applicable. Family Tree Chart of Modification Relationship: N/A Interchangeability or Intermixability of Parts: N/A ### Page 2 Service Bulletin SB057 C QS-FO 89B Nr. Ausgabe/ no. edition Referenziert in/ referenced in Seite / Page QS-FO 89B BH Part 3 (DOH) 2 of 4 4 Accomplishment Instructions The instructions given here replaces instructions from the Component and Maintenance Manuals CCM. The procedures and instructions here are the valid ones. 4.1 Common notes Wearing of PPE is not required, excepting safety shoes. Pay attention to cleanness and orderliness. Using of calibrated and signed tools are mandatory for check of usage/ function and also before use check with master calibration. If damage, wrong adjustment the QA must be informed to block the tool and assignment of a new tool. 5 Procedure Step 1: Torque blade nut to fourfold torque moment Step 2: Loosen blade nut for a minimum for half a turn Step 3: Repeat step 1 to 2 Step 4: Torque blade nut to basic moment Propeller model Blade nut spanner Adapter Required torque to be applied to the blade nut to preload the blade retention system as specified. [Nm] Torque wrench type Garant 120 (ref table 2) Torque wrench type Garant 200 (ref table 2) Basic torque moment Fourfold torque moment Fourfold torque moment [Nm] Tolerance (±10%) [Nm] Tolerance (±10%) [Nm] Tolerance (±10%) V42 PV-1106 PV-2580 24.5 15 60 n/a V62 PV-625 PV-2580 27.5 17 68 n/a V72 PV-756 PV-2580 57.5 33 n/a 143 V113 PV-625 PV-2580 27.5 17 68 n/a V123 PV-739 PV-2580 37.5 21 84 n/a V132 PV-855 PV-2580 37.5 21 84 n/a V144 PV-739 PV-2580 37.5 21 84 n/a V155 PV-756 PV-2580 57.5 33 n/a 143 V183 PV-855 PV-2580 37.5 21 84 n/a V245 PV-1127 PV-2580 14.5 8 32 n/a V254 PV-1053 PV-2758 51 20 80 n/a V334 PV-756 PV-2580 57.5 33 n/a 143 ### Page 3 Service Bulletin SB057 C QS-FO 89B Nr. Ausgabe/ no. edition Referenziert in/ referenced in Seite / Page QS-FO 89B BH Part 3 (DOH) 3 of 4 Propeller model Blade nut spanner Adapter Required torque to be applied to the blade nut to preload the blade retention system as specified. [Nm] Torque wrench type Garant 120 (ref table 2) Torque wrench type Garant 200 (ref table 2) Basic torque moment Fourfold torque moment Fourfold torque moment [Nm] Tolerance (±10%) [Nm] Tolerance (±10%) [Nm] Tolerance (±10%) V343 PV-756 PV-2580 67.5 38 n/a 168 V352 PV-1931 PV-2580 31.5 18 72 n/a V373 PV-855 PV-2580 37.5 21 84 n/a V383 PV-625 PV-2580 27.5 17 68 n/a V412 PV-739 PV-2580 37.5 21 84 n/a V435 PV-2725 PV-2758 108 43 n/a 197 V455 PV-2698 PV-2850 66.5 26 104 n/a V465 PV-2451 PV-2758 108 43 n/a 197 V485 PV-2698 PV-2850 66.5 26 104 n/a V504 PV-739 PV-2580 37.5 21 84 n/a V522 PV-2870 PV-2580 31.5 20 80 n/a V545 PV-756 PV-2580 57.5 33 n/a n/a V715 PV-2698 PV-2850 66.5 26 104 n/a V733 PV-1053 PV-2758 51 20 80 n/a table 1: Overview of tool combinations and applicable torques NOTE: THE TORQUE VALUES GIVEN IN table 1 ARE TO BE SET ON THE TORQUE WRENCH. THE TORQUE NO LONGER HAS TO BE CONVERTED TO THE STITCH SIZE ETC. Torque wrench type Model l1 [mm] l2 [mm] Garant 120 (20-120Nm) 656055-120 301 25 Garant 200 (40-200Nm) 656055-200 398 25 table 2: Torque wrench types NOTE: THE USE OF TORQUE WRENCHES OTHER THAN THOSE LISTED IN TABLE 2 IS NOT PERMITTED. NOTE: OTHER TORQUE WRENCHES CAN BE ADDED ON REQUEST. ### Page 4 Service Bulletin SB057 C QS-FO 89B Nr. Ausgabe/ no. edition Referenziert in/ referenced in Seite / Page QS-FO 89B BH Part 3 (DOH) 4 of 4 Figure 1 Torque wrench with adapter and blade spanner 6 Approval Statement The technical content of this document is approved under the authority of the DOA ref. EASA. 21J.083. --- 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, except the copies of manufacturers’ service documents, which belong to their rights holders.