# Proposed AD FAA-2007-27023: Pratt & Whitney JT9D Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2007-05-17
- Products: Pratt & Whitney Division
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 22, 2011, 76 FR 72130
- Comments due: January 23, 2012
- Became: [AD 2007-05-17](https://openairdocs.org/ad/2007-05-17)
- Docket: FAA-2007-27023 (https://www.regulations.gov/docket/FAA-2007-27023, where comments are filed)
- Project: 98-ANE-47-AD
- FR document: 2011-30062
- Official PDF: https://openairdocs.org/files/sha256/36/b6/36b6561357c8472598edbf86d085d2c4bdb64c6df2f3abd042b9b6ecf4c479f4 (from https://www.govinfo.gov/content/pkg/FR-2011-11-22/pdf/2011-30062.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/11/22/2011-30062/airworthiness-directives-pratt-and-whitney-jt9d-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6A41690FFCA10B3D86257950004DAD50.0001
- Page: https://openairdocs.org/proposed/FAA-2007-27023

## Summary

We propose to supersede an existing airworthiness directive (AD) that applies to all Pratt & Whitney (PW) JT9D series turbofan engines. The existing AD currently requires revisions to the Airworthiness Limitations Section (ALS) of the manufacturer's Instructions for Continued Airworthiness (ICA) to include required enhanced inspection of selected critical life-limited parts at each piece-part opportunity. Since we issued that AD, PW has added mandatory inspections for certain critical life-limited parts. This proposed AD would require additional revisions to the JT9D series engines ALS sections of the manufacturer's ICA. This proposed AD results from the need to require enhanced inspection of selected critical life-limited parts of JT9D series engines. We are proposing this AD to prevent critical life-limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane.

## Notices in this docket

- Nov 22, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-30062, comments due Jan 23, 2012 (https://www.federalregister.gov/documents/2011/11/22/2011-30062/airworthiness-directives-pratt-and-whitney-jt9d-series-turbofan-engines)

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