# Proposed AD 97-NM-78-AD: Withdrawal - Boeing Model 777 Series Airplanes Equipped With Pratt & Whitney Engines and Used in Extended Range Twin- Engine Operations (ETOPS)

- Type: Proposed airworthiness directive (not in force)
- Status: Withdrawn
- Products: Boeing
- Product type: Aircraft
- Action: Proposed rule; withdrawal.
- Published: October 6, 2005, 70 FR 58357
- Comments due: September 28, 2005
- Docket: 97-NM-78-AD
- FR document: 05-20076
- Official PDF: https://openairdocs.org/files/sha256/f4/82/f482c29199c65b32bd4d31e55868d5eeb4dfbe8c0de796a1ab6713dc40dc8ccd (from https://www.govinfo.gov/content/pkg/FR-2005-10-06/pdf/05-20076.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/10/06/05-20076/airworthiness-directives-boeing-model-777-series-airplanes-equipped-with-pratt-and-whitney-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6D56FF29C3DC95CE862570920058E466.0001
- Page: https://openairdocs.org/proposed/97-NM-78-AD

## Summary

This action withdraws a notice of proposed rulemaking (NPRM) that proposed a new airworthiness directive (AD), applicable to certain Boeing Model 777 series airplanes equipped with Pratt & Whitney engines. That action would have required replacement of the integrated drive generator (IDG) and the backup generator with a new IDG and a new backup generator. Since the issuance of the NPRM, the Federal Aviation Administration (FAA) has received new data that indicate that all affected airplanes worldwide have the proper parts installed and all spares are accounted for, and that the identified unsafe condition (loss of electrical power) cannot occur for the reasons specified by the NPRM. Accordingly, the proposed rule is withdrawn.

## Notices in this docket

- Jan 5, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-118, comments due Feb 19, 1998 (https://www.federalregister.gov/documents/1998/01/05/98-118/airworthiness-directives-boeing-model-777-series-airplanes-equipped-with-pratt-and-whitney-engines)
- Oct 6, 2005: Proposed rule; withdrawal., FR document 05-20076, comments due Sep 28, 2005 (https://www.federalregister.gov/documents/2005/10/06/05-20076/airworthiness-directives-boeing-model-777-series-airplanes-equipped-with-pratt-and-whitney-engines)

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