# Proposed AD FAA-2021-0339: Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-14-09
- Products: Airbus Canada Limited Partnership
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 26, 2021, 86 FR 21967
- Comments due: June 10, 2021
- Became: [AD 2021-14-09](https://openairdocs.org/ad/2021-14-09)
- Docket: FAA-2021-0339 (https://www.regulations.gov/docket/FAA-2021-0339, where comments are filed)
- Project: MCAI-2020-01605-T
- FR document: 2021-08620
- Official PDF: https://openairdocs.org/files/sha256/a6/6b/a66b8dd652b2c635fc3fc36825fc441821d0a5f2498c031f099331b9666ae2d5 (from https://www.govinfo.gov/content/pkg/FR-2021-04-26/pdf/2021-08620.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/04/26/2021-08620/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CAF812E958CD771F862586C3006E3033.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0339

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD- 500-1A11 airplanes. This proposed AD was prompted by a design review that identified rib 0 of the center wing box (CWB) as an area where a single failure of a clamshell type refuel/defuel line coupling could lead to the accumulation of dangerous levels of electrostatic charges within the fuel tank. This proposed AD would require replacing the clamshell type refuel/defuel line coupling in the CWB at rib 0 with a threaded type fuel coupling, and installing an additional support bracket and clamp in the CWB at rib 0, as specified in a Transport Canada Civil Aviation (TCCA) AD, which is proposed for incorporation by reference. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 26, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-08620, comments due Jun 10, 2021 (https://www.federalregister.gov/documents/2021/04/26/2021-08620/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c)

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