Airworthiness Directive · Amendment 39-17389 · Aircraft fuel filter/strainer
Sikorsky Aircraft Corporation Helicopters
This AD applies to Sikorsky Aircraft Corporation Model S-61A, D, E, L, N, NM, R, and V helicopters with a fuel system 40 micron fuel filter element, part number (P/N) 52-0505-2 or 52-01064-1, certificated in any category.
We are adopting a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-61A, D, E, L, N, NM, R, and V helicopters to require replacing 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.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
(1) Within 150 hours time-in-service, do the following:
(i) Replace each forward and aft fuel system 40 micron fuel filter element with a 10 micron nominal (40 micron absolute) fuel filter element, P/N AM52-01064-1.
(ii) Re-identify the fuel filter, P/N 52-2145-009, and fuel control assembly bracket as follows:
(A) On the fuel filter identification plate, cross out the last two digits (“09”) of the existing fuel filter P/N 52-2145-009, and replace those last two digits with “14” to re-identify the fuel filter as P/N 52-2145-014.
(B) Change the existing fuel control assembly part number on the fuel control assembly bracket to re-identify it as follows:
(1) Change fuel control assembly P/N S6130-63209-001 to P/N S6130-63209-041.
(2) Change fuel control assembly P/N S6130-63209-002 to P/N S6130-63209-042.
(3) Change fuel control assembly P/N S6130-63209-003 to P/N S6130-63209-043.
(4) Change fuel control assembly P/N S6130-63209-004 to P/N S6130-63209-044.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
