Airworthiness directives › 2004-24-04
AD 2004-24-04 Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) Models 250-C30R/3, -C30R/3M, -C47B, and -C47M Turboshaft Engines
Applicability*9
This AD applies to Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) models 250-C30R/3, -C30R/3M, -C47B, and -C47M turboshaft engines that have a hydromechanical unit (HMU) with a part number (P/N) listed in 1.A. Group A of RRC Alert Commercial Engine Bulletins (ACEB) No. CEB A-73-3103, Revision 4, dated December 2, 2003; and No. CEB A-73-6030, Revision 4, dated December 2, 2003. These engines are installed on, but not limited to, Bell OH-58D, Bell Helicopter Textron 407, Boeing AH/MH-6M, and MD Helicopters Inc. 600N helicopters.
Compliance
Compliance with this AD is required as indicated, unless already done. Initial Inspection (f) Perform an initial electrical signal inspection of the HMU Power Lever Angle (PLA) potentiometer, within 300 flight hours (FH) after the effective date of this AD. Use paragraphs 2.B. through 2.B.(8) and 2.B.(10) of the Accomplishment Instructions of RRC ACEB No. CEB A-73-3103, Revision 4, dated December 2, 2003; or No. CEB A-73-6030, Revision 4, dated December 2, 2003; to perform the inspection. (g) Replace the HMU before further flight if the electrical signal inspection result is unacceptable. Repetitive Inspections (h) Thereafter, perform repetitive electrical signal inspections of the HMU PLA potentiometer within 300 FH of the last inspection. Use paragraphs 2.B. through 2.B.(8) and 2.B.(10) of the Accomplishment Instructions of RRC ACEB No. CEB A-73-3103, Revision 4, dated December 2, 2003; or No. CEB A-73-6030, Revision 4, dated December 2, 2003; to perform the inspection. (i) Replace the HMU before further flight if the electrical signal inspection result is unacceptable. Mandatory Terminating Action (j) Replace the HMU with an HMU that has a P/N not specified in this AD within 600 FH after the effective date of this AD, or January 31, 2005, whichever occurs earlier. Replacing the HMU with an HMU that has a P/N not specified in this AD terminates the repetitive inspection requirement specified in paragraph (h) of this AD. Alternative Methods of
Unsafe condition
This AD results from the manufacturer releasing a redesigned HMU that has a dual-element potentiometer. The actions specified in this AD are intended to prevent uncommanded and sudden changes in engine power.
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