# Proposed AD FAA-2006-26110: Boeing Model 747-400, 747-400D, and 747-400F Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-13-22
- Products: Boeing
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: August 23, 2007, 72 FR 48246
- Comments due: September 17, 2007
- Became: [AD 2008-13-22](https://openairdocs.org/ad/2008-13-22)
- Docket: FAA-2006-26110 (https://www.regulations.gov/docket/FAA-2006-26110, where comments are filed)
- Project: 2006-NM-112-AD
- FR document: E7-16659
- Official PDF: https://openairdocs.org/files/sha256/99/bc/99bc2ea3b22c9a588541a60d53d2922acce351b20d7bac8845111b8405b1b35b (from https://www.govinfo.gov/content/pkg/FR-2007-08-23/pdf/E7-16659.pdf)
- Federal Register: https://www.federalregister.gov/documents/2007/08/23/E7-16659/airworthiness-directives-boeing-model-747-400-747-400d-and-747-400f-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E4299E0EFB4CA645862573400064D4CE.0001
- Page: https://openairdocs.org/proposed/FAA-2006-26110

## Summary

The FAA is revising an earlier proposed airworthiness directive (AD) for certain Boeing Model 747-400, 747-400D, and 747-400F series airplanes. The original NPRM would have required replacement of an electronic flight instrument system/engine indicating and crew alerting system (EFIS/EICAS) interface unit (EIU) located on the E2-6 shelf of the main equipment center with a new or modified EIU. The original NPRM resulted from two instances where all six integrated display units (IDUs) on the flight deck panels went blank in flight. This action revises the original NPRM by reducing the compliance time for replacing the EIU. We are proposing this supplemental NPRM to prevent loss of the IDUs due to failure of all three EIUs, which could result in the inability of the flightcrew to maintain safe flight and landing of the airplane.

## Notices in this docket

- Oct 26, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-17655, comments due Dec 11, 2006 (https://www.federalregister.gov/documents/2006/10/26/E6-17655/airworthiness-directives-boeing-model-747-400-747-400d-and-747-400f-series-airplanes)
- Aug 23, 2007: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document E7-16659, comments due Sep 17, 2007 (https://www.federalregister.gov/documents/2007/08/23/E7-16659/airworthiness-directives-boeing-model-747-400-747-400d-and-747-400f-series-airplanes)

---
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.