# Proposed AD 2001-NM-148-AD: BAE Systems (Operations) Limited Model BAe 146 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-05-11
- Products: BAE Systems
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 24, 2003, 68 FR 74532
- Comments due: January 23, 2004
- Became: [AD 2004-05-11](https://openairdocs.org/ad/2004-05-11)
- Docket: 2001-NM-148-AD
- FR document: 03-31441
- Official PDF: https://openairdocs.org/files/sha256/c1/3d/c13d0e0ce5e7877a7e488ed7ba561187dede8c55def6272cedbed12e82287cd8 (from https://www.govinfo.gov/content/pkg/FR-2003-12-24/pdf/03-31441.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/12/24/03-31441/airworthiness-directives-bae-systems-operations-limited-model-bae-146-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FCBC1DC2E0E823FE86256E06004C837C.0001
- Page: https://openairdocs.org/proposed/2001-NM-148-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all BAE Systems (Operations) Limited Model BAe 146 series airplanes. This proposal would require repetitive general visual inspections of the inside of the condenser regenerative air ducts, air cycle machine turbine outlet, and the jet pump ducts on each air conditioning pack to detect oil and/or oil breakdown products leaking from the engine(s) or auxiliary power unit (APU). This proposal would also require further inspections and replacement of any affected engine, APU, or component with a serviceable part, if necessary. This action is necessary to prevent impairment of the operational skills and abilities of the flight crew caused by oil or oil breakdown products in the cabin air, which could result in reduced controllability of the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Dec 24, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-31441, comments due Jan 23, 2004 (https://www.federalregister.gov/documents/2003/12/24/03-31441/airworthiness-directives-bae-systems-operations-limited-model-bae-146-series-airplanes)

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