# Proposed AD 2002-NM-23-AD: Boeing Model 747-200B and -200F Series Airplanes Powered by Pratt & Whitney JT9D-70 Series Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-04-11
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 27, 2002, 67 FR 70875
- Comments due: January 13, 2003
- Became: [AD 2003-04-11](https://openairdocs.org/ad/2003-04-11)
- Docket: 2002-NM-23-AD
- FR document: 02-30027
- Official PDF: https://openairdocs.org/files/sha256/d4/11/d41196a167dfd47ba67412797bfac4355d2419a06eda819358d534b6ed76058c (from https://www.govinfo.gov/content/pkg/FR-2002-11-27/pdf/02-30027.pdf)
- Federal Register: https://www.federalregister.gov/documents/2002/11/27/02-30027/airworthiness-directives-boeing-model-747-200b-and--200f-series-airplanes-powered-by-pratt-and
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/02ED258929092BD986256C7E004F5C46.0001
- Page: https://openairdocs.org/proposed/2002-NM-23-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 747-200B and -200F series airplanes powered by Pratt & Whitney JT9D-70 series engines. This proposal would require repetitive detailed inspections of the pylon skin and internal structure of the nacelle struts adjacent to and aft of the precooler exhaust vent for heat damage (discoloration), wrinkling, and cracking; and corrective action, if necessary. This action is necessary to find and fix such damage, which could result in cracking or fracture of the nacelle struts, and consequent reduced structural integrity and possible separation of the strut and engine from the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Nov 27, 2002: Notice of proposed rulemaking (NPRM). (first notice), FR document 02-30027, comments due Jan 13, 2003 (https://www.federalregister.gov/documents/2002/11/27/02-30027/airworthiness-directives-boeing-model-747-200b-and--200f-series-airplanes-powered-by-pratt-and)

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