Airworthiness Directive · Amendment 39-16509 · General Electric Company (GE) CT7-9C and -9C3 Turboprop Engines
General Electric Company (GE) CT7-9C and -9C3 Turboprop Engines
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.
| 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 |
We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires inspecting certain serial number (S/N) gas generator turbine (GGT) shafts for nonconforming land balance-cuts, and if found, removing the shaft from service. This AD was prompted by 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.
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.
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.
