# Special Conditions: McDonnell-Douglas Model DC-9-31/-32, High- Intensity Radiated Fields
> **Rule** · Final special conditions; request for comments. · Published 1997-05-21 · Effective 1997-05-13 · 62 FR 27687
## Document
- **Document number:** 97-13264
- **Category:** other
- **Type:** Rule
- **Action:** Final special conditions; request for comments.
- **Citation:** 62 FR 27687
- **Publication date:** 1997-05-21
- **Effective date:** 1997-05-13
- **FAA docket:** Docket No. NM-142
## Abstract

These special conditions are issued for McDonnell-Douglas Model DC-9-31/-32 airplanes as modified by Innovative Solutions & Support, Inc. The Innovative Solutions & Support, Inc. altimeter P/N 9D-80110-2 will utilize an electronic system which performs a critical function. The applicable 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/1997/05/21/97-13264/special-conditions-mcdonnell-douglas-model-dc-9-31-32-high--intensity-radiated-fields)
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