# Proposed AD FAA-2012-0644: The Cessna Aircraft Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-18-16
- Products: Cessna
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 25, 2012, 77 FR 37827
- Comments due: August 9, 2012
- Became: [AD 2012-18-16](https://openairdocs.org/ad/2012-18-16)
- Docket: FAA-2012-0644 (https://www.regulations.gov/docket/FAA-2012-0644, where comments are filed)
- Project: 2012-NM-011-AD
- FR document: 2012-15451
- Official PDF: https://openairdocs.org/files/sha256/31/44/31443a2539f8c868d00b0b922f8b31372827ec3bc98128e4c2ae5c549f167d13 (from https://www.govinfo.gov/content/pkg/FR-2012-06-25/pdf/2012-15451.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/06/25/2012-15451/airworthiness-directives-the-cessna-aircraft-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/ADE0B2E8C41C0F6186257A280065A409.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0644

## Summary

We propose to adopt a new airworthiness directive (AD) for certain The Cessna Aircraft Company Model 750 airplanes. This proposed AD was prompted by reports of direct current (DC) generator overvoltage events. This proposed AD would require replacing the auxiliary power unit (APU) generator control unit (GCU). We are proposing this AD to prevent DC generator overvoltage events, which could result in subsequent smoke in the cockpit and loss of avionics and electrical systems.

## Notices in this docket

- Jun 25, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-15451, comments due Aug 9, 2012 (https://www.federalregister.gov/documents/2012/06/25/2012-15451/airworthiness-directives-the-cessna-aircraft-company-airplanes)

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