# Proposed AD FAA-2005-21787: Shadin ADC-2000 Air Data Computers

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-25-08
- Products: Shadin
- Product type: Appliance
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 17, 2005, 70 FR 48333
- Comments due: October 11, 2005
- Became: [AD 2005-25-08](https://openairdocs.org/ad/2005-25-08)
- Docket: FAA-2005-21787 (https://www.regulations.gov/docket/FAA-2005-21787, where comments are filed)
- Project: 2005-CE-34-AD
- FR document: 05-16267
- Official PDF: https://openairdocs.org/files/sha256/14/9a/149af745f5ada66cc05ae65dcb7bafa6a2783032fc0f1ca74d22af214272b99f (from https://www.govinfo.gov/content/pkg/FR-2005-08-17/pdf/05-16267.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/08/17/05-16267/airworthiness-directives-shadin-adc-2000-air-data-computers
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2DBD55ABAB11586486257060004F085D.0001
- Page: https://openairdocs.org/proposed/FAA-2005-21787

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Shadin ADC-2000 air data computers (ADC) installed on airplanes. This proposed AD would require you to replace affected ADC- 2000 units with a modified unit. This proposed AD results from reports that certain ADC-2000 units display incorrect altitude information on the Electronic Flight Information System (EFIS) to the pilot. We are issuing this proposed AD to prevent ADC-2000 units, part numbers (P/Ns) 962830A-1-S-8, 962830A-2-S-8, and 962830A-3-S-8, configurations B, C, and D, from displaying incorrect altitude information. This could cause the flight crew to react to this incorrect flight information and possibly result in an unsafe operating condition.

## Notices in this docket

- Aug 17, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-16267, comments due Oct 11, 2005 (https://www.federalregister.gov/documents/2005/08/17/05-16267/airworthiness-directives-shadin-adc-2000-air-data-computers)

---
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.