# Proposed AD FAA-2007-0346: Boeing Model 737-300, -400, and -500 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-06-24
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 19, 2007, 72 FR 71830
- Comments due: February 4, 2008
- Became: [AD 2008-06-24](https://openairdocs.org/ad/2008-06-24)
- Docket: FAA-2007-0346 (https://www.regulations.gov/docket/FAA-2007-0346, where comments are filed)
- Project: 2007-NM-202-AD
- FR document: E7-24521
- Official PDF: https://openairdocs.org/files/sha256/bb/0d/bb0d43787e7a40f12c962d4cd217e6af9a543c4729554f2c365f972d62549c35 (from https://www.govinfo.gov/content/pkg/FR-2007-12-19/pdf/E7-24521.pdf)
- Federal Register: https://www.federalregister.gov/documents/2007/12/19/E7-24521/airworthiness-directives-boeing-model-737-300--400-and--500-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/623152E76EE43C34862573DB00667738.0001
- Page: https://openairdocs.org/proposed/FAA-2007-0346

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Model 737-300, -400, and -500 series airplanes. This proposed AD would require an inspection to determine the manufacturer and manufacture date of the oxygen masks in the passenger service unit and the lavatory and attendant box assemblies, corrective action if necessary, and other specified action. This proposed AD results from a report that several passenger masks with broken in-line flow indicators were found following a mask deployment. We are proposing this AD to prevent the in-line flow indicators of the passenger oxygen masks from fracturing and separating, which could inhibit oxygen flow to the masks and consequently result in exposure of the passengers and cabin attendants to hypoxia following a depressurization event.

## Notices in this docket

- Dec 19, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-24521, comments due Feb 4, 2008 (https://www.federalregister.gov/documents/2007/12/19/E7-24521/airworthiness-directives-boeing-model-737-300--400-and--500-series-airplanes)

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