# Proposed AD FAA-2007-27891: Honeywell International Inc. TFE731-2C, -3B, -3BR, -3C, -3CR, -3D, -3DR, -4R, -5AR, -5BR, -5R, -20R, -20AR, - 20BR, -40, -40AR, -40R, and -60 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-02-19
- Products: Honeywell International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 4, 2007, 72 FR 50648
- Comments due: November 5, 2007
- Became: [AD 2008-02-19](https://openairdocs.org/ad/2008-02-19)
- Docket: FAA-2007-27891 (https://www.regulations.gov/docket/FAA-2007-27891, where comments are filed)
- Project: 2007-NE-14-AD
- FR document: E7-17384
- Official PDF: https://openairdocs.org/files/sha256/e4/94/e494c39e73358b2b0861ae85106a46d0f7b2d1b12dbfd5f11fe590afa516fdac (from https://www.govinfo.gov/content/pkg/FR-2007-09-04/pdf/E7-17384.pdf)
- Federal Register: https://www.federalregister.gov/documents/2007/09/04/E7-17384/airworthiness-directives-honeywell-international-inc-tfe731-2c--3b--3br--3c--3cr--3d--3dr--4r--5ar
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EFC0A849D4D0AE958625734C00614FFF.0001
- Page: https://openairdocs.org/proposed/FAA-2007-27891

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Honeywell International Inc. (Honeywell) TFE731-2C, -3B, -3BR, -3C, -3CR, -3D, -3DR, -4R, -5AR, -5BR, -5R, -20R, -20AR, -20BR, -40, -40AR, -40R, and -60 series turbofan engines. This proposed AD would require removal from service of certain high pressure (HP) turbine rotor assemblies with part numbers (P/Ns) 3075772-1 and 3060841-1 using a drawdown schedule, and returning them to Honeywell for curvic root radius inspection. This proposed AD results from the manufacturer's report that some HP turbine rotor discs received improperly machined radii in the root of the forward and aft curvic teeth during manufacture. We are proposing this AD to prevent uncontained failure of the HP turbine rotor assembly and damage to the airplane.

## Notices in this docket

- Sep 4, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-17384, comments due Nov 5, 2007 (https://www.federalregister.gov/documents/2007/09/04/E7-17384/airworthiness-directives-honeywell-international-inc-tfe731-2c--3b--3br--3c--3cr--3d--3dr--4r--5ar)

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