# Proposed AD FAA-2005-20872: Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A (C-21A), and 36 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-13-36
- Products: Learjet
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 6, 2005, 70 FR 17349
- Comments due: May 23, 2005
- Became: [AD 2005-13-36](https://openairdocs.org/ad/2005-13-36)
- Docket: FAA-2005-20872 (https://www.regulations.gov/docket/FAA-2005-20872, where comments are filed)
- Project: 2004-NM-271-AD
- FR document: 05-6767
- Official PDF: https://openairdocs.org/files/sha256/01/b6/01b6a1a0af7ef93430ec712b45948c7a9c0b205e5a18909471dfbdda6e2f1b6c (from https://www.govinfo.gov/content/pkg/FR-2005-04-06/pdf/05-6767.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/04/06/05-6767/airworthiness-directives-learjet-model-23-24-24a-24b-24b-a-24c-24d-24d-a-24e-24f-24f-a-25-25a-25b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0BBD0E6F8E554BFC86256FDB006AC8FC.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20872

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A (C-21A), and 36 airplanes. This proposed AD would require a one-time inspection of the center ball of the aileron control cable or cables for a defective swage, and corrective actions if necessary. This proposed AD is prompted by a report indicating that an aileron cable failed on one affected airplane when the cable underwent a tension check. We are proposing this AD to prevent severe weakening of the aileron cable, and consequent reduced controllability of the airplane.

## Notices in this docket

- Apr 6, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-6767, comments due May 23, 2005 (https://www.federalregister.gov/documents/2005/04/06/05-6767/airworthiness-directives-learjet-model-23-24-24a-24b-24b-a-24c-24d-24d-a-24e-24f-24f-a-25-25a-25b)

---
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.