Airworthiness directives › 2007-05-17
AD 2007-05-17 Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines
Applicability*9
This AD applies to Pratt & Whitney (PW) JT9D-3A, -7, -7A, -7H, -7AH, -7F, -7J, -20J, -59A, -70A, -7Q, -7Q3, -7R4D, -7R4D1, -7R4E, -7R4E1, -7R4E4, -7R4G2, and -7R4H1 series turbofan engines. These engines are installed on, but not limited to, Boeing 747 and 767 series, McDonnell Douglas DC-10 series, and Airbus Industrie A300 and A310 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. (f) Within the next 180 days after the effective date of this AD, revise the manufacturer's Instructions for Continued Airworthiness Limitations Section (ALS), and for air carrier operations revise the approved continuous airworthiness maintenance program by adding the following: Mandatory Inspections (1) Perform inspections of the following parts at each piece-part opportunity in accordance with the instructions provided in the applicable manual provisions: Engine model Engine manual part number (P/N) Part nomenclature Inspect per manual section Inspection/check 3A/7/7A/7AH/7F/7H/7J/20/20J *646028 (or the equivalent customized versions, 770407 and 770408) All Fan Hubs 72-31-04 Inspection-02. All HPC Stage 5-15 Disks and Rear Compressor Drive Turbine Shafts 72-35-00 Inspection-03. All HPT Stage 1-2 Disks and Hubs 72-51-00 Inspection-03. All HPT Stage 2 Disk Web Tie-rod Holes 72-51-02 Inspection-05. All LPT Stage 3-6 Disks and Hubs 72-52-00 Inspection-03. 59A/70A 754459 All Fan Hubs 72-31-00 Check-00. All HPC Stage 5-15 Disks and Rear Compressor Drive Turbine Shafts 72-35-00 Check-00. All HPT Stage 1-2 Disks and Hubs 72-51-00 Check-03. All HPT Stage 1 Disk Web Cooling Holes 72-51-02 Check-03. All LPT Stage 3-6 Disks and Hubs 72-52-00 Check-03. 7Q/7Q3 777210 All Fan Hubs 72-31-00 Inspection-03. All HPC Stage 5-15 Disks and Rear Compressor Drive Turbine Shafts 72-35-00 Inspection-03. All HPT Stage 1-2 Disks and Hubs 72-51-00 Inspection-03. All HPT Stage 1 Disk Web Cooling Holes 72-51-06 Inspection-03. All LPT Stage 3-6 Disks and Hubs 72-52-00 Inspection-03. 7R4 ALL 785058, 785059, and 789328 All Fan Hubs 72-31-00 Inspection/Check-03. All HPC Stage 5-15 Disks and Rear Compressor Drive Turbine Shafts 72-35-00 Inspection/Check 03. All HPT Stage 1-2 Disks and Hubs 72-51-00 Inspection/Check 03. All LPT Stage 3-6 Disks and Hubs 72-52-00 Inspection/Check 03. 7R4D/D1/E/E1 785058 and 785059 All HPT Stage 1 Disk Web Cooling Holes 72-51-06 Inspection/Check-02. * P/N 770407 and 770408 are customized versions of P/N 646028 engine manual. (2) For the purposes of these mandatory inspections, piece-part opportunity means: (i) The part is considered completely disassembled when done in accordance with the disassembly instructions in the manufacturer's engine manual; and (ii) The part has accumulated more than 100 cycles-in-service since the last piece-part opportunity inspection, provided that the part was not damaged or related to the cause for its removal from the engine.” Alternative Methods of
Unsafe condition
This AD results from the need to require enhanced inspection of selected critical life-limited parts of JT9D series turbofan engines. We are issuing this AD to prevent critical life-limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane.
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