# Proposed AD FAA-2012-1157: BAE SYSTEMS (Operations) Limited Model airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-04-13
- Products: BAE Systems
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 5, 2012, 77 FR 66415
- Comments due: December 20, 2012
- Became: [AD 2013-04-13](https://openairdocs.org/ad/2013-04-13)
- Docket: FAA-2012-1157 (https://www.regulations.gov/docket/FAA-2012-1157, where comments are filed)
- Project: 2012-NM-061-AD
- FR document: 2012-26897
- Official PDF: https://openairdocs.org/files/sha256/32/60/32605ec9a8810a44d5d4b855ce8b6cbf19f5aa2d8bb501d7c65c3ed06f87ed05 (from https://www.govinfo.gov/content/pkg/FR-2012-11-05/pdf/2012-26897.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/11/05/2012-26897/airworthiness-directives-bae-systems-operations-limited-model-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/367E383B722262FE86257AAD004ECFF1.0001
- Page: https://openairdocs.org/proposed/FAA-2012-1157

## Summary

We propose to adopt a new airworthiness directive (AD) for all BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ series airplanes. This proposed AD was prompted by a report that certain ceramic terminal blocks, through which the wiring for the engine fire extinguishers, fire detection circuits, and engine and intake anti-ice system are routed, have been found to have moisture ingress which can degrade the insulation resistance of the ceramic terminal blocks. This proposed AD would require a one-time insulation resistance test of ceramic terminal blocks, and if necessary, replacement of the blocks. We are proposing this AD to prevent latent failure of the number 2 fire bottle, which, in the event of an engine fire, could result in failure of the fire bottle to discharge when activated and possibly preventing the flightcrew from extinguishing an engine fire.

## Notices in this docket

- Nov 5, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-26897, comments due Dec 20, 2012 (https://www.federalregister.gov/documents/2012/11/05/2012-26897/airworthiness-directives-bae-systems-operations-limited-model-airplanes)

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