Airworthiness Directive · Amendment 39-22153 · Propeller system
MT-Propeller Entwicklung GmbH Propellers
This AD applies to MT-Propeller Entwicklung GmbH:
(1) MTV-5-1-(), MTV-9-(), MTV-12-(), MTV-14-B, MTV-14-D, MTV-15-(), MTV-16-(), MTV-18-(), and MTV-27-() variable pitch propellers with a propeller serial number (S/N) identified in MT-Propeller Entwicklung GmbH Alert Service Bulletin (ASB) No. 30, Revision 7, dated June 23, 2022 (MT-Propeller ASB No. 30, Rev. 7); and
(2) MTV-5-1-(), MTV-9-(), MTV-11-(), MTV-12-(), MTV-14-B, MTV-14-D, MTV-15-(), MTV-16-(), MTV-17-(), MTV-18-(), MTV-20-(), and MTV-27-() variable pitch propellers with a propeller blade S/N identified in MT-Propeller ASB No. 30, Rev. 7, installed.
The FAA is adopting a new airworthiness directive (AD) for certain MT-Propeller Entwicklung GmbH MTV-5-1-( ), MTV-9-( ), MTV-11-( ), MTV-12-( ), MTV-14-B, MTV-14-D, MTV-15-( ), MTV-16-( ), MTV-17-( ), MTV-18-( ), MTV-20-( ), and MTV-27-( ) variable pitch propellers. This AD was prompted by reports of certain propeller blade lag screws that were manufactured with an improper surface finish, which results in reduced fatigue strength of these lag screws. This AD requires replacement of certain propeller blade lag screws with parts eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
(1) If the affected propeller or propeller blade is installed on a turboprop engine, before exceeding 120 days from the effective date of this AD, or within 50 flight hours (FHs) from the effective date of this AD, whichever occurs first, remove from service any propeller blade lag screw with part number (P/N) A-983-C-85 and replace with a part eligible for installation.
(2) If the affected propeller or propeller blade is installed on a piston engine, before exceeding 60 days from the effective date of this AD, or within 25 FHs from the effective date of this AD, whichever occurs first, remove from service any propeller blade lag screw with P/N A-983-C-85 and replace with a part eligible for installation.
For the purpose of this AD, a “part eligible for installation” is any propeller blade lag screw with P/N A-983-D-85 or P/N A-983-E-85.
After the effective date of this AD, do not install a propeller blade lag screw with P/N A-983-C-85 onto any propeller or propeller blade.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Propellers
