Airworthiness directives › 2010-23-20
AD 2010-23-20 Airworthiness Directives; General Electric Company (GE) CT7-9C and -9C3 Turboprop Engines
Applicability*9
This AD applies to GE CT7-9C and -9C3 turboprop engines with gas generator turbine (GGT) shafts, part number (P/N) 6068T44P02, that have a serial number (S/N) listed in Table 1 of this AD, installed. These engines are installed on, but not limited to, EADS CASA (formerly Construcciones Aeronauticas, S.A.) CN-235 series airplanes. Table 1—Affected GGT Shaft S/Ns Affected Shaft S/Ns GATHHCPC GATHHJR7 GATHHJR9 GATHHKG6 GATHHM9R GATHHWM3 GATHJ4ED GATHJ9FL GATHJ19J GATHJE8P GATHJWWR GATHK0KM GATHK2N1 GATHK3M3 GATHK90K GATHK96D GATHKF9R GATHKH36 GATHKMP7 GATHKRKN NCE715DA
Compliance
You are responsible for having the actions required by this AD performed at the first shop visit after the effective date of this AD, or within 5,000 cycles- since-new, whichever occurs first, unless the actions have already been done. Inspection for Nonconforming Land Balance-Cuts (f) For CT7-9C and -9C3 engines with a GGT shaft, P/N 6068T44P02, that has a S/N listed in Table 1 of this AD, installed, inspect the shaft for nonconforming land balance-cuts. Use the Accomplishment Instructions 3.A.(1) through 3.A.(4) of GE CT7-TP Alert Service Bulletin 72-A0501, Revision 01, dated March 3, 2010, to perform the inspection. (g) If you find any nonconforming land balance-cuts, remove the shaft from service. Alternative Methods of
Unsafe condition
This AD results from reports of a manufacturing quality problem. We are issuing this AD to detect nonconforming GGT shaft land balance-cuts, which could result in the shaft failing before its published life limit, and which could result in an uncontained engine failure and damage to the airplane.
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