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By Dave W
FLYER Club Member  FLYER Club Member
#1656202
From the Flyer News section, but worth a thread here perhaps.

Flyer wrote:An Emergency Airworthiness Directive (AD) has been issued for Rotax 915/915 engines by the European Aviation Safety Agency (EASA) and the UK CAA. Any aircraft fitted with the relevant engine is grounded until the AD has been complied with.

The AD follows a Service Bulletin issued by Rotax and concerns a deviation in the manufacturing process of an exhaust valve.

A broken exhaust valve has been reported on a non-certified Rotax 914 UL2-01 engine. Subsequent investigation identified deviation in the manufacturing process of the affected exhaust valve.

“This condition, if not corrected, could lead to in-flight shut down, possibly resulting in a forced landing with consequent damage to the aeroplane and injury to occupants.,” says EASA.

Due to similarity of design, this condition may affect also Rotax 915 iSc3 A, 915 iSc3 B engines and Rotax 914 F2, 914 F3 and 914 F4 engines. The AD requires replacement of affected exhaust valves.

The AD can be found here.
By riverrock
FLYER Club Member  FLYER Club Member
#1656209
They aren't immediately grounded:
Within 10 flight hours or 3 months, whichever occurs first after the effective date of this AD, replace each affected exhaust valve with an exhaust valve having P/N 854114, in accordance with the instructions of the ASB.

Effective date = 11 December 2018
#1656656
These are engines delivered in the last 6 months or so, so unless they have done an unusually high number of hours it will be under warranty. The last time we had a similar issue (engine push-rods) CFS came and fixed the affected engine on-site and we only had to pay a very modest fee for travel costs.
G-BLEW liked this