Airworthiness Directive 97-25-08
one-timeAirworthiness Directives; General Electric Company CJ610 Series Turbojet and CF700 Series Turbofan Engines
What this AD requires
This amendment adopts a new airworthiness directive (AD) that is applicable to General Electric Company (GE) CJ610 series turbojet and CF700 series turbofan engines. This action requires removal from service of possibly defective turbine torque rings and compressor drive shafts which may have been manufactured from contaminated material; and replacement with serviceable parts. This amendment is prompted by a report of a cooling plate removed from a GE CT58 series engine that was found to have an iron-rich inclusion that came from a contaminated heat lot. Parts on GE CJ610 series and CF700 series engines which were manufactured from the same and similar heat lots may also be contaminated. The actions specified in this AD are intended to prevent turbine torque ring or compressor drive shaft failure due to a manufacturing defect, which could result in an uncontained engine failure.
Which aircraft AD 97-25-08 applies to
Applies to CJ610 series turbojet and CF700 series turbofan engines with turbine torque rings and compressor drive shafts identified in GE CF700 SB No. A72-155, dated May 22, 1997, and GE CJ610 SB No. A72-147, dated May 22, 1997. Installed on but not limited to Learjet 20 series, Israel Aircraft Industries Westwind series, Hansa Jet, Aero Commander Jet Commander, Dassault Falcon 20 series, and Sabreliner 265 series aircraft.
Whether AD 97-25-08 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.