# Airworthiness Directives; Various Boeing and McDonnell Douglas Transport Category Airplanes
> **Rule** · Final rule. · Published 2003-01-31 · Effective 2003-03-07 · 68 FR 4892
## Document
- **Document number:** 03-2147
- **Category:** airworthiness
- **Manufacturer:** Various Boeing and McDonnell Douglas Transport Category
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 68 FR 4892
- **Publication date:** 2003-01-31
- **Effective date:** 2003-03-07
- **FAA docket:** Docket No. 2002-NM-43-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to various Boeing and McDonnell Douglas transport category airplanes. This AD requires revising the Airplane Flight Manual (AFM) to advise the flightcrew to don oxygen masks as a first and immediate step when the cabin altitude warning horn sounds. This action is necessary to prevent incapacitation of the flightcrew due to lack of oxygen, which could result in loss of control of the airplane. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/01/31/03-2147/airworthiness-directives-various-boeing-and-mcdonnell-douglas-transport-category-airplanes)
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