# Proposed AD FAA-2015-0827: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 15, 2015, 80 FR 20181
- Comments due: June 1, 2015
- Docket: FAA-2015-0827 (https://www.regulations.gov/docket/FAA-2015-0827, where comments are filed)
- Project: 2014-NM-008-AD
- FR document: 2015-08463
- Official PDF: https://openairdocs.org/files/sha256/46/f9/46f9dcc7de45d6857c39326ab8275669e64ca6f5a96b3a10d5d5115b5201cc44 (from https://www.govinfo.gov/content/pkg/FR-2015-04-15/pdf/2015-08463.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/04/15/2015-08463/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F5CCE4566577287786257E28004B32E1.0001
- Page: https://openairdocs.org/proposed/FAA-2015-0827

## Summary

We propose to supersede Airworthiness Directive (AD) 2011-07- 10, for certain Bombardier, Inc. Model BD-100-1A10 (Challenger 300) airplanes. AD 2011-07-10 currently requires revising the Airworthiness Limitations section of the Instructions for Continued Airworthiness; doing detailed visual inspections; removing discrepant material; cleaning the surfaces of the valves, the plug of the sensing port, and the cabin pressure-sensing port plug; securing the insulation; installing a new safety valve, and replacing certain cabin pressure-sensing port plugs. Since we issued AD 2011-07-10, we have received reports of in-flight loss of cabin pressurization that was attributed to partial blockage of a safety valve cabin pressure-sensing port in conjunction with a failed safety valve manometric capsule. This proposed AD would retain all requirements of AD 2011-07-10. This proposed AD would also require a detailed visual inspection of both safety valves and the surrounding area for foreignmaterial, room temperature vulcanizing (RTV) silicone, contamination, foam on the bulkhead structure, tape or insulation, and loose material; and corrective actions if necessary. We are proposing this AD to detect and correct blockage of a safety valve cabin pressure-sensing port, which could result in loss of cabin pressure.

## Notices in this docket

- Apr 15, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-08463, comments due Jun 1, 2015 (https://www.federalregister.gov/documents/2015/04/15/2015-08463/airworthiness-directives-bombardier-inc-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.