# Proposed AD FAA-2021-0201: 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 2021-22-17
- Products: Airbus Canada Limited Partnership
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 1, 2021, 86 FR 17087
- Comments due: May 17, 2021
- Became: [AD 2021-22-17](https://openairdocs.org/ad/2021-22-17)
- Docket: FAA-2021-0201 (https://www.regulations.gov/docket/FAA-2021-0201, where comments are filed)
- Project: MCAI-2020-01346-T
- FR document: 2021-06550
- Official PDF: https://openairdocs.org/files/sha256/d3/0f/d30fe864481923806148c017ef9fbcedeee7957f963202e5454126bc26548bff (from https://www.govinfo.gov/content/pkg/FR-2021-04-01/pdf/2021-06550.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/04/01/2021-06550/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4B6A244D5571E9E7862586AA007556F4.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0201

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500- 1A11 airplanes. This proposed AD was prompted by a report of cracking in certain components on left and right sides of the aft wing-to-body fairing (WTBF) structure near the tie-rod attachment at a certain fuselage station; this cracking likely resulted from excessive tie-rod preload. This proposed AD would require inspecting the aft WTBF structure for any cracking or damage, adjusting the load on the two tie-rods at a certain fuselage station, and repair if necessary, 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 1, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-06550, comments due May 17, 2021 (https://www.federalregister.gov/documents/2021/04/01/2021-06550/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c)

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