# Proposed AD 99-NE-47-AD: Withdrawal -- Rolls-Royce Corporation (Formerly Allison Engine Company) 250-C18 and C-20 Series Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Withdrawn
- Products: Rolls-Royce
- Product type: Engine
- Action: Proposed rule; withdrawal.
- Published: August 24, 2001, 66 FR 44560
- Comments due: August 15, 2001
- Docket: 99-NE-47-AD
- FR document: 01-21398
- Official PDF: https://openairdocs.org/files/sha256/d5/50/d550d779e745ed711b621dbda2fa31c3ec226a7399745f40bd39fd12e3c0f3cf (from https://www.govinfo.gov/content/pkg/FR-2001-08-24/pdf/01-21398.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/08/24/01-21398/airworthiness-directives-rolls-royce-corporation-formerly-allison-engine-company-250-c18-and-c-20
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D63669F0A56AF62D86256B290066B949.0001
- Page: https://openairdocs.org/proposed/99-NE-47-AD

## Summary

This action withdraws a notice of proposed rulemaking (NPRM) that proposed a new airworthiness directive (AD), applicable to Rolls-Royce Corporation (formerly Allison Engine Company) 250-C18 and C-20 series turboshaft engines. That action would have required a one-time visual inspection of the fuel nozzle screen for contamination. If contamination is found, the proposal would have required, prior to further flight, replacement of the fuel nozzle screen with a serviceable screen, visual inspection of the entire fuel system for contamination, and repair, if necessary. In addition, this proposal would have required reporting the results of the one-time inspection to the Federal Aviation Administration (FAA) to determine if repetitive inspections should be required by further rulemaking. This proposal was prompted by a report of fuel system contamination that caused an in-flight engine shutdown, autorotation, and forced landing. Since the issuance of the NPRM, the FAA and Rolls-Royce have determined that there have been no additional engine problems reported due to fuel nozzle screen contamination. Accordingly, the proposed rule is withdrawn.

## Notices in this docket

- Apr 25, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-10291, comments due Jun 26, 2000 (https://www.federalregister.gov/documents/2000/04/25/00-10291/airworthiness-directives-allison-engine-company-250-c18-and--c20-series-turboshaft-engines)
- Aug 24, 2001: Proposed rule; withdrawal., FR document 01-21398, comments due Aug 15, 2001 (https://www.federalregister.gov/documents/2001/08/24/01-21398/airworthiness-directives-rolls-royce-corporation-formerly-allison-engine-company-250-c18-and-c-20)

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