# Airworthiness Directives; McDonnell Douglas Model DC-9-31, DC-9-32, DC-9-32F, DC-9-33F, DC-9-34, and DC-9-34F Airplanes; and Model DC-9-40 and DC-9-50 Series Airplanes
> **Rule** · Final rule. · Published 2006-07-05 · Effective 2006-08-09 · 71 FR 38053
## Document
- **Document number:** 06-5871
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 38053
- **Publication date:** 2006-07-05
- **Effective date:** 2006-08-09
- **FAA docket:** Docket No. FAA-2006-24430
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain transport category airplanes, identified above. This AD requires installing a bonding jumper from the boost pump volute to the fuel tank structure, and related investigative/corrective actions. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent point-contact arcing or filament heating in the fuel tank, which, in the event of a short or ground fault inside the fuel tank, could result in a fuel tank explosion and consequent loss of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/07/05/06-5871/airworthiness-directives-mcdonnell-douglas-model-dc-9-31-dc-9-32-dc-9-32f-dc-9-33f-dc-9-34-and)
---
*AI Analytics · CC0 1.0*