# Proposed AD 2003-NM-91-AD: Various Boeing and McDonnell Douglas Transport Category Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-03-15 R1
- Products: Boeing and McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 9, 2003, 68 FR 40823
- Comments due: August 25, 2003
- Became: [AD 2003-03-15 R1](https://openairdocs.org/ad/2003-03-15-R1)
- Docket: 2003-NM-91-AD
- FR document: 03-17317
- Official PDF: https://openairdocs.org/files/sha256/47/f5/47f5c336577733a1ee33b06005cf4213e72518f360d2589a3d60e3029809b9de (from https://www.govinfo.gov/content/pkg/FR-2003-07-09/pdf/03-17317.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/07/09/03-17317/airworthiness-directives-various-boeing-and-mcdonnell-douglas-transport-category-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4914FA2F8651B9BF86256D5E0052A4D6.0001
- Page: https://openairdocs.org/proposed/2003-NM-91-AD

## Summary

This document proposes to revise an existing airworthiness directive (AD), applicable to various Boeing and McDonnell Douglas transport category airplanes, that currently 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. The actions specified by that AD are intended to prevent incapacitation of the flightcrew due to lack of oxygen, which could result in loss of control of the airplane. This action would remove certain requirements for certain airplanes and revises the direction to the flightcrew to don oxygen masks as a first and immediate step when the cabin altitude warning occurs, rather than "when the cabin altitude warning horn sounds." This action is intended to address the identified unsafe condition.

## Notices in this docket

- Jul 9, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-17317, comments due Aug 25, 2003 (https://www.federalregister.gov/documents/2003/07/09/03-17317/airworthiness-directives-various-boeing-and-mcdonnell-douglas-transport-category-airplanes)

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