# Airworthiness Directives; Bombardier Model CL-600-1A11 and CL- 600-2A12 Series Airplanes
> **Rule** · Final rule. · Published 1998-01-30 · Effective 1998-03-06 · 63 FR 4564
## Document
- **Document number:** 98-1973
- **Category:** airworthiness
- **Manufacturer:** Bombardier Model CL-600-1A11 and CL- 600-2A12 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 4564
- **Publication date:** 1998-01-30
- **Effective date:** 1998-03-06
- **FAA docket:** Docket No. 97-NM-256-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Bombardier Model CL-600-1A11 and CL-600-2A12 series airplanes, that requires replacement of the anti-noise filter on the standby and auxiliary power unit (APU) fuel pump assemblies with a new filter. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/01/30/98-1973/airworthiness-directives-bombardier-model-cl-600-1a11-and-cl--600-2a12-series-airplanes)
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