# Proposed AD FAA-2004-19943: Boeing Model 757-200 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-06-02
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 28, 2004, 69 FR 77675
- Comments due: February 11, 2005
- Became: [AD 2005-06-02](https://openairdocs.org/ad/2005-06-02)
- Docket: FAA-2004-19943 (https://www.regulations.gov/docket/FAA-2004-19943, where comments are filed)
- Project: 2004-NM-76-AD
- FR document: 04-28250
- Official PDF: https://openairdocs.org/files/sha256/96/88/96885f0c83bef56c0a07aa634330d6bc409ebfba994e940599c54982325d3464 (from https://www.govinfo.gov/content/pkg/FR-2004-12-28/pdf/04-28250.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/12/28/04-28250/airworthiness-directives-boeing-model-757-200-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/63FE14CB66913DFE86256F7800549E66.0001
- Page: https://openairdocs.org/proposed/FAA-2004-19943

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing Model 757-200 series airplanes. This proposed AD would require modifying the wiring of the test ground signal for the master dim and test system circuit in the flight compartment. This proposed AD is prompted by a report that the master dim and test system circuit does not have wiring separation of the test ground signal for redundant equipment in the flight compartment. We are proposing this AD to prevent a single fault failure during flight, which could result in test patterns instead of the selected radio frequencies showing on the communications panel. These conditions could adversely affect voice and transponder communication capability between the flightcrew and air traffic control, which could result in increased pilot workload.

## Notices in this docket

- Dec 28, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-28250, comments due Feb 11, 2005 (https://www.federalregister.gov/documents/2004/12/28/04-28250/airworthiness-directives-boeing-model-757-200-series-airplanes)

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