# Airworthiness Directives; McDonnell Douglas Model DC-9-10, -20, - 30, -40, and -50 Series Airplanes, and C-9 (Military) Airplanes
> **Rule** · Final rule. · Published 1999-11-12 · Effective 1999-12-17 · 64 FR 61477
## Document
- **Document number:** 99-28744
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 61477
- **Publication date:** 1999-11-12
- **Effective date:** 1999-12-17
- **FAA docket:** Docket No. 99-NM-186-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 series airplanes, and C-9 (military) airplanes, that requires a one-time general visual inspection to detect certain discrepancies in the wiring of the fuel quantity indicating system (FQIS) in the forward cargo compartment; and corrective actions, if necessary. This amendment is prompted by a report indicating that several discrepancies were found in the wiring of the FQIS due to maintenance or alteration practices. The actions specified by this AD are intended to prevent excessive electrical energy from entering the fuel tanks through the FQIS wiring, which could result in a potential ignition source in the fuel tanks.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/11/12/99-28744/airworthiness-directives-mcdonnell-douglas-model-dc-9-10--20---30--40-and--50-series-airplanes-and)
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