# Proposed AD FAA-2010-0958: McDonnell Douglas Corporation Model DC- 9-14, DC-9-15, and DC-9-15F Airplanes; and DC-9-20, DC-9-30, DC-9-40, and DC-9-50 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-07-04
- Products: McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 8, 2010, 75 FR 62331
- Comments due: November 22, 2010
- Became: [AD 2011-07-04](https://openairdocs.org/ad/2011-07-04)
- Docket: FAA-2010-0958 (https://www.regulations.gov/docket/FAA-2010-0958, where comments are filed)
- Project: 2010-NM-188-AD
- FR document: 2010-25374
- Official PDF: https://openairdocs.org/files/sha256/01/da/01da6213f74ba93121ba5f90dc6a10f7c7ad343d586c0fdc147f6fd5584d1105 (from https://www.govinfo.gov/content/pkg/FR-2010-10-08/pdf/2010-25374.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/10/08/2010-25374/airworthiness-directives-mcdonnell-douglas-corporation-model-dc-9-14-dc-9-15-and-dc-9-15f-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/368A9F2561FE6187862577B60048AA43.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0958

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD would require installing new in-line fuses for the fuel level float switch and new in-line fuses for the pressure switch, as applicable, and changing the wiring. The proposed actions would affect the left and right wing forward spars, center wing forward spar, forward auxiliary fuel tank, and aft auxiliary fuel tank, as applicable. This proposed AD was prompted by 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

- Oct 8, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-25374, comments due Nov 22, 2010 (https://www.federalregister.gov/documents/2010/10/08/2010-25374/airworthiness-directives-mcdonnell-douglas-corporation-model-dc-9-14-dc-9-15-and-dc-9-15f-airplanes)

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