9 July 2025

TBO Increase to 3600 Hours or 6 Years for the Silent-7 MT Propeller Series

MT-Propeller has increased the TBO of its Silent-7 propeller series to 3,600 hours or 6 years, following outstanding inspection results. This upgrade highlights the durability and performance of MT's 7-bladed composite propellers, used on aircraft such as the Pilatus PC-12 and King Air 350.
Supplied by: MT Propeller Series
Supplied by: MT Propeller Series

After reaching another milestone with 130 flying Silent-7 propellers, several propellers were inspected based on the certification requirements after 2,000 hours in service. The propellers showed basically no wear or abnormalities.

Mayday-SA

Due to these excellent inspection results, the engineering team at MT-Propeller was able to increase the TBO for the 7-bladed propellers – presently installed on the Pilatus PC-12 series, the King Air 350 series and the Short Skyvan – to 3,600 hours or 6 years, whichever comes first.

MT-Propeller is a world leading natural composite propeller manufacturer with 30 certified propeller models from 2-blade to 7-blade hydraulically controlled variable pitch propellers, for engines producing up to 5000hp, and 2-blade to 4-blade electrically controlled variable pitch propellers, for engines producing up to 350hp, as well as two blade fixed pitch propellers.

The high performance, lightweight and durable MT-Propellers can be used on aircraft with piston engines and propeller turbines, as well as on airships, wind tunnels and hovercraft. MT-Propellers can be developed for nearly every aircraft type, from motor gliders to regional airliners.

TBO Increase to 3600 Hours or 6 Years for the Silent-7 MT Propeller Series
Supplied by: MT Propeller Series

Fulfilling the highest certification requirements, they are also supplemental type certified on Part 25 aircraft.

MT-Propeller is a holder of over 230 STCs worldwide and an OEM supplier for more than 90% of the European Aircraft Industry, as well as 30% of the US Aircraft Industry. More than 33,000 propeller systems with more than 115,000 blades are in service.

180 million fleet hours have already been performed on MT-Propellers. With the longest industry TBO of 4,500 hours or 6 years for the 5-bladed turboprop, MT-Propeller has proven its reliability over the years. A factory certified network of 62 service centres provides the best service and maintenance all over the world.

The official document, SB-1 R10, can be downloaded here https://www.mt-propeller.com/pdf/sbs/sb1r10.pdf

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