# Proposed AD 99-NM-84-AD: Boeing Model 737-200, -200C, -300, and -400 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-06-13
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 12, 1999, 64 FR 43950
- Comments due: September 27, 1999
- Became: [AD 2000-06-13](https://openairdocs.org/ad/2000-06-13)
- Docket: 99-NM-84-AD
- FR document: 99-20881
- Official PDF: https://openairdocs.org/files/sha256/ef/2e/ef2e26e4a489d2f501ea4621b307f36c6f8ddf5e6a555dfb7ae61ee74f4043cf (from https://www.govinfo.gov/content/pkg/FR-1999-08-12/pdf/99-20881.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/08/12/99-20881/airworthiness-directives-boeing-model-737-200--200c--300-and--400-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-84-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Boeing Model 737- 200, -200C, -300, and -400 series airplanes, that currently requires repetitive visual inspections to detect cracking of the corners of the door frame and the cross beams of the aft cargo door, and corrective actions, if necessary. That AD also provides an optional terminating action for certain repetitive inspections. This action would add requirements for repetitive high frequency eddy current (HFEC) inspections, and corrective actions, if necessary. This action also would mandate accomplishment of the previously optional terminating action. The actions specified by the proposed AD are intended to prevent fatigue cracking of the corners of the door frame and the cross beams of the aft cargo door, which could result in rapid depressurization of the airplane.

## Notices in this docket

- Aug 12, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-20881, comments due Sep 27, 1999 (https://www.federalregister.gov/documents/1999/08/12/99-20881/airworthiness-directives-boeing-model-737-200--200c--300-and--400-series-airplanes)

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