Airworthiness directives › 2004-15-02
AD 2004-15-02 Airworthiness Directives; Rolls-Royce plc RB211 Trent 800 Series Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce plc (RR) models RB211 Trent 875-17, Trent 877-17, Trent 884-17, Trent 884B-17, Trent 892-17, Trent 892B-17, and Trent 895-17 turbofan engines, with low pressure (LP) compressor fan blades, part number (P/N) FW18548, installed. These engines are installed on, but not limited to, Boeing 777 series airplanes.
Compliance
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. Actions Required for LP Compressor Fan Blades (f) Replace LP compressor fan blades with new or previously reworked LP compressor blades at or before accumulating the specified cycles-since-new (CSN) in the following Table 1, or rework the existing blades as specified in paragraph (g) of this AD. (g) Rework LP compressor fan blades at or before accumulating the specified CSN in the following Table 1. Follow paragraphs 3.B.(1) through 3.B.(22) of Accomplishment Instructions of RR service bulletin (SB) No. RB.211-72-E044, Revision 1, dated May 2, 2003, to do the blade rework. Table 1.—LP Compressor Fan Blade Replacement or Rework Schedule For engines installed on: Engine model: Replace or rework LP compressor fan blades at or before accumulating Boeing 777-300 Series Trent 884-17 2,400 CSN. Boeing 777-300 Series Trent 884B-17 2,400 CSN. Boeing 777-300 Series Trent 892-17 2,400 CSN. Boeing 777-200 Series Trent 895-17 3,200 CSN. Boeing 777-200 Series Trent 892-17 4,100 CSN. Boeing 777-200 Series Trent 892B-17 4,100 CSN. Boeing 777-200 Series Trent 884-17 4,100 CSN. Boeing 777-200 Series Trent 875-17 4,100 CSN. Boeing 777-200 Series Trent 877-17 4,100 CSN. (h) For engines moved between configurations, the cycles remaining may be calculated using either of the following: (1) Subtract the total CSN from the most limiting configuration's limit from Table 1; or (2) Calculate the cycles remaining using the following equation: Where: X r = Cycles remaining in current configuration. L c = Cyclic limit of current configuration from Table 1 of this AD. X n = Cycles accumulated in configuration n . L n = Cyclic limit in configuration n from Table 1. (i) Information on the source life of the cycle limits in Table 1 of this AD can be found in RR Alert SB No. RB.211-72-AE055, Revision 3, dated May 28, 2003. Alternative Methods of
Unsafe condition
This AD was prompted by a number of new production LP compressor blades found with surfaces formed outside of design intent. Findings included sharp edges, burrs, and damage present in the area at the top of the shear key slots. We are issuing this AD to prevent possible multiple uncontained LP compressor fan blade failure, due to cracking in the blade root caused by increased stresses in the shear key slots.
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