# Special Conditions: McDonnell Douglas Model DC-9-81, -82, -83, and -87 Airplanes; High Intensity Radiated Fields (HIRF)
> **Rule** · Final special conditions; request for comments. · Published 2003-05-07 · Effective 2003-04-14 · 68 FR 24338
## Document
- **Document number:** 03-11227
- **Category:** other
- **Type:** Rule
- **Action:** Final special conditions; request for comments.
- **Citation:** 68 FR 24338
- **Publication date:** 2003-05-07
- **Effective date:** 2003-04-14
- **FAA docket:** Docket No. NM252, Special Conditions No. 25-235-SC
## Abstract

These special conditions are issued for McDonnell Douglas Model DC-9-81, -82, -83, and -87 airplanes modified by Electronic Cable Specialists. These airplanes will have novel or unusual design features when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes. The modification involves installation of electronic flight displays that perform critical functions. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for the protection of these systems from the effects of high-intensity-radiated fields (HIRF). These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/05/07/03-11227/special-conditions-mcdonnell-douglas-model-dc-9-81--82--83-and--87-airplanes-high-intensity-radiated)
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