# Airworthiness Directives; Boeing Model 777-200 and 777-300 Series Airplanes
> **Rule** · Final rule. · Published 2005-05-11 · Effective 2005-06-15 · 70 FR 24703
## Document
- **Document number:** 05-9198
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 777-200 and 777-300 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 70 FR 24703
- **Publication date:** 2005-05-11
- **Effective date:** 2005-06-15
- **FAA docket:** Docket No. FAA-2005-20081
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 777-200 and -300 series airplanes. This AD requires modification of the operational program software (OPS) of the air data inertial reference unit (ADIRU). This AD is prompted by a report of the display of erroneous heading information to the pilot due to a defect in the OPS of the ADIRU. We are issuing this AD to prevent the display of erroneous heading information to the pilot, which could result in loss of the main sources of attitude data, consequent high pilot workload, and subsequent deviation from the intended flight path.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/05/11/05-9198/airworthiness-directives-boeing-model-777-200-and-777-300-series-airplanes)
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