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Emergency AD Steps Up Urgency of Manufacturer Service Instructions

The Federal Aviation Administration has issued an emergency airworthiness directive (AD 2017-16-11)   that will require operators of  subject Lycoming engines to inspect and possibly replace affected connecting rod small-end bushings in Lycoming engines overhauled between November 2015 and February 2017. The AD was published using emergency rules  where the administration determined  “An unsafe condition exists that requires the immediate adoption of this AD” and which waive mandatory notice and comment periods.

The move comes days after the manufacturer published its Mandatory Service Bulletin 632 .

If you have questions about AD 2017-16-11 or corresponding SB 632, Lycoming has set up a Frequently Asked Questions Page:

Service Bulletin No. 632 Frequently Asked Questions