Airworthiness directives › 2013-05-17
AD 2013-05-17 Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
Applicability*9
This AD becomes effective April 26, 2013.
Compliance
(1) The Manager, Boston Aircraft Certification Office, FAA, may approve AMOCs for this AD. Send your proposal to: Kirk Gustafson, Aerospace Engineer, Boston Aircraft Certification Office, Engine and Propeller Directorate, FAA, 12 New England Executive Park, Burlington, MA 01803; telephone (781) 238-7190; email kirk.gustafson@faa.gov. (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, we suggest that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office before operating any aircraft complying with this AD through an AMOC.
Required actions
Sikorsky Aircraft Corporation Alert Service Bulletin No. 61B30-16, dated February 2, 1010, which is not incorporated by reference, contains additional information about the subject of this AD. For this service information, contact Sikorsky Aircraft Corporation, Attn: Manager, Commercial Technical Support, mailstop s581a, 6900 Main St., Stratford, CT; telephone (203) 383-4866; email tsslibrary@sikorsky.com, or at http://www.sikorsky.com. You may review a copy of this service information at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 76137.
Unsafe condition
(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.
Affected ADs
This AD defines the unsafe condition as contaminants present in the engine fuel control units (FCUs). This AD was prompted by a National Transportation Safety Board review of in-service events where engine performance degradation occurred. This condition could result in 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.
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