# Proposed AD FAA-2012-0597: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-05-05
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 18, 2012, 77 FR 36206
- Comments due: August 2, 2012
- Became: [AD 2013-05-05](https://openairdocs.org/ad/2013-05-05)
- Docket: FAA-2012-0597 (https://www.regulations.gov/docket/FAA-2012-0597, where comments are filed)
- Project: 2012-NM-054-AD
- FR document: 2012-14794
- Official PDF: https://openairdocs.org/files/sha256/ac/77/ac77ab8fe68bfdeffaac012b2c6b27510f06c850104ac4f4b58098c88d6c6c41 (from https://www.govinfo.gov/content/pkg/FR-2012-06-18/pdf/2012-14794.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/06/18/2012-14794/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6D4C21FA6D14CD1D86257A21004E6DB6.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0597

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes. This proposed AD was prompted by reports of in-service events related to electrical power system malfunctions resulting in damage to electrical load management system (ELMS) P200 and P300 power panels and the surrounding area. This proposed AD would require installing enclosure trays to contain debris in certain ELMS panels, and replacing certain ELMS contactors. We are proposing this AD to prevent contactor failures, which could result in uncontained hot debris flow due to ELMS contactor breakdown, consequent smoke and heat damage to airplane structure and equipment during ground operations, and possible injuries to passengers and crew.

## Notices in this docket

- Jun 18, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-14794, comments due Aug 2, 2012 (https://www.federalregister.gov/documents/2012/06/18/2012-14794/airworthiness-directives-the-boeing-company-airplanes)

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