The European Aviation Safety Agency (EASA) has ordered CFM CFM56-5 and -5B operators in the Commonwealth of Independent States (CIS) to limit use of TS-1 fuel or replace hydro mechanical units (HMU) after several inflight shutdowns have been traced to fuel contaminants. In directive No. 2012-0123 issued Monday, EASA says that “some” shutdowns have been caused by HMU failures due to “corrosion and consequential seizure of the HMU delta-p valve.” Fuel samples of TS-1, a light kerosene ...

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