# Proposed AD 97-NM-256-AD: Bombardier Model CL-600-1A11 and CL- 600-2A12 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-03-02
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 19, 1997, 62 FR 61706
- Comments due: December 19, 1997
- Became: [AD 98-03-02](https://openairdocs.org/ad/98-03-02)
- Docket: 97-NM-256-AD
- FR document: 97-30328
- Official PDF: https://openairdocs.org/files/sha256/3d/61/3d614395db373fccd4a182dbf3d111c8a2c76edd8cc95c1c5eb0c2721cf04535 (from https://www.govinfo.gov/content/pkg/FR-1997-11-19/pdf/97-30328.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/11/19/97-30328/airworthiness-directives-bombardier-model-cl-600-1a11-and-cl--600-2a12-series-airplanes
- Page: https://openairdocs.org/proposed/97-NM-256-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Bombardier Model CL-600-1A11 and CL-600-2A12 series airplanes. This proposal would require replacement of the anti-noise filter on the standby and auxiliary power unit (APU) fuel pump assemblies with a new filter. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent electrical arcing between the internal wiring and casing of the anti-noise filter on the standby and APU fuel pump assemblies, and consequent increased risk of fuel tank explosion or fire.

## Notices in this docket

- Nov 19, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-30328, comments due Dec 19, 1997 (https://www.federalregister.gov/documents/1997/11/19/97-30328/airworthiness-directives-bombardier-model-cl-600-1a11-and-cl--600-2a12-series-airplanes)

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