# Proposed AD 2000-NM-265-AD: Lockheed Model 188A and 188C Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-23-10
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 30, 2000, 65 FR 52677
- Comments due: October 16, 2000
- Became: [AD 2000-23-10](https://openairdocs.org/ad/2000-23-10)
- Docket: 2000-NM-265-AD
- FR document: 00-22123
- Official PDF: https://openairdocs.org/files/sha256/bd/4d/bd4d6a670980022b29faaf9449943b1b7e248862c8ca7105971d99937a5ef8e9 (from https://www.govinfo.gov/content/pkg/FR-2000-08-30/pdf/00-22123.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/08/30/00-22123/airworthiness-directives-lockheed-model-188a-and-188c-series-airplanes
- Page: https://openairdocs.org/proposed/2000-NM-265-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Lockheed Model 188A and 188C series airplanes. This proposal would require a revision of the Airplane Flight Manual (AFM) to add procedures for donning the flightcrew oxygen masks when the cabin altitude warning horn is activated. This action is intended to prevent incapacitation of the flightcrew as a result of lack of oxygen and consequent loss of control of the airplane due to absence of AFM procedures for donning the flightcrew oxygen masks when the cabin altitude warning horn is activated.

## Notices in this docket

- Aug 30, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-22123, comments due Oct 16, 2000 (https://www.federalregister.gov/documents/2000/08/30/00-22123/airworthiness-directives-lockheed-model-188a-and-188c-series-airplanes)

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