# Proposed AD FAA-2010-0549: McDonnell Douglas Corporation Model DC- 9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and MD-88 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-01-16
- Products: McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 18, 2010, 75 FR 34661
- Comments due: August 2, 2010
- Became: [AD 2011-01-16](https://openairdocs.org/ad/2011-01-16)
- Docket: FAA-2010-0549 (https://www.regulations.gov/docket/FAA-2010-0549, where comments are filed)
- Project: 2010-NM-109-AD
- FR document: 2010-14796
- Official PDF: https://openairdocs.org/files/sha256/1f/c8/1fc865a6a83e1e8cb9d518e02556e7b9b46dff3655544413e38b9be69b57271e (from https://www.govinfo.gov/content/pkg/FR-2010-06-18/pdf/2010-14796.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/06/18/2010-14796/airworthiness-directives-mcdonnell-douglas-corporation-model-dc-9-81-md-81-dc-9-82-md-82-dc-9-83
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/00DAD2979D59199186257746004E9C63.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0549

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9- 87 (MD-87), and MD-88 airplanes. This proposed AD would require installing fuel level float and pressure switch in-line fuses on the wing forward spars and forward and aft auxiliary fuel tanks, depending on the airplane configuration. This proposed AD results from fuel system reviews conducted by the manufacturer. We are proposing this AD to prevent the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapors, could result in fuel tank explosions and consequent loss of the airplane.

## Notices in this docket

- Jun 18, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-14796, comments due Aug 2, 2010 (https://www.federalregister.gov/documents/2010/06/18/2010-14796/airworthiness-directives-mcdonnell-douglas-corporation-model-dc-9-81-md-81-dc-9-82-md-82-dc-9-83)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.