Fri, Mar 29, 2013
AD NUMBER: 2013-05-17
PRODUCT: Sikorsky Aircraft Corporation (Sikorsky) Model S-61A, D, E, L, N, NM, R, and V helicopters.
SUBJECT: Airworthiness Directive 2013-05-17
ACTION: Final Rule
SUMMARY: This AD requires the replacement of each forward and aft fuel system 40 micron fuel filter element with a 10 micron nominal (40 micron absolute) fuel filter element.
This AD was prompted by a National Transportation Safety Board (NTSB) review of in-service events where engine performance degradation occurred, and the review determined that some of these events were caused by contaminants larger than 10 microns present in the engine fuel control units (FCUs).
The actions are intended to prevent particulate contamination in the FCU, which could lead to malfunction of an internal valve, power loss at a critical phase of flight, and loss of control of the helicopter.
DATES: This AD is effective April 26, 2013.
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