# Proposed AD FAA-2005-20944: General Electric Company CT7-5, -7, and -9 Series Turboprop Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-18-01
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 31, 2006, 71 FR 16248
- Comments due: May 30, 2006
- Became: [AD 2005-18-01](https://openairdocs.org/ad/2005-18-01)
- Docket: FAA-2005-20944 (https://www.regulations.gov/docket/FAA-2005-20944, where comments are filed)
- Project: 2003-NE-64-AD
- FR document: E6-4700
- Official PDF: https://openairdocs.org/files/sha256/2f/30/2f306cfc658ca5a1f2356e4b20c0487c09b1bbc337400bc7bbf47509b6dd9d82 (from https://www.govinfo.gov/content/pkg/FR-2006-03-31/pdf/E6-4700.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/03/31/E6-4700/airworthiness-directives-general-electric-company-ct7-5--7-and--9-series-turboprop-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8F0941758611C3FE8625714200605AAC.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20944

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) for General Electric Company (GE) CT7-5A2, -5A3, -7A, - 7A1, -9B, -9B1, and -9B2 turboprop engines, with certain part number (P/N) and serial number stage 2 turbine aft cooling plates installed. That AD currently requires a onetime eddy current inspection (ECI) of boltholes in certain P/N stage 2 turbine aft cooling plates. This proposed AD would expand the population of affected CT7 turboprop engine models, but would reduce the number of cooling plates affected. It would also require a onetime ECI of boltholes in certain P/N stage 2 turbine aft cooling plates. This proposed AD results from the manufacturer identifying the affected stage 2 turbine aft cooling plates by serial number. We are proposing this AD to prevent separation of the stage 2 turbine aft cooling plate, resulting in uncontained engine failure and damage to the airplane.

## Notices in this docket

- Apr 15, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-7561, comments due Jun 14, 2005 (https://www.federalregister.gov/documents/2005/04/15/05-7561/airworthiness-directives-general-electric-company-ct7-5--7-and--9-series-turboprop-engines)
- Mar 31, 2006: Notice of proposed rulemaking (NPRM)., FR document E6-4700, comments due May 30, 2006 (https://www.federalregister.gov/documents/2006/03/31/E6-4700/airworthiness-directives-general-electric-company-ct7-5--7-and--9-series-turboprop-engines)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.