AD 2021-17-01 Requires Removing A Certain Oil Pump From Service And Replacing It
The FAA is adopting a new airworthiness directive (AD) for all Austro Engine GmbH E4 and E4P model diesel piston engines. This AD was prompted by a report of oil pressure loss on an E4 model diesel piston engine. This AD requires removing a certain oil pump from service and replacing it with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective August 23, 2021.
Supplementary Information: The European Union Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community, issued EASA Emergency AD 2021-0143-E, dated June 16, 2021 (referred to after this as “the MCAI”), to address the unsafe condition on these products.
The MCAI states:
An occurrence was reported of oil pressure loss on an E4 engine. Subsequent investigation determined that a certain batch of oil pumps was produced with a dimensional deviation on the inner gear/shaft. The inner gear/shaft of those pumps may come into contact with the pump housing, which might create debris and cause jamming of the oil pump.
This condition, if not corrected, could lead to engine in-flight shut-down with consequent forced landing, possibly resulting in damage to the aeroplane and injury to occupants.
To address this potential unsafe condition, Austro Engine published the [service bulletin] to provide instructions to replace the affected oil pumps.
For the reason described above, this [EASA] AD requires replacement of affected parts with serviceable parts, as defined in this [EASA] AD. This [EASA] AD also prohibits (re)installation of affected parts on all engines.
You may obtain further information by examining the MCAI in the AD docket at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-0654.
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