# Proposed AD FAA-2008-0857: Dornier Model 328-300 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-01-06
- Products: 328 Support Services
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 11, 2008, 73 FR 46569
- Comments due: September 10, 2008
- Became: [AD 2009-01-06](https://openairdocs.org/ad/2009-01-06)
- Docket: FAA-2008-0857 (https://www.regulations.gov/docket/FAA-2008-0857, where comments are filed)
- Project: 2007-NM-317-AD
- FR document: E8-18434
- Official PDF: https://openairdocs.org/files/sha256/96/01/96016bcebae115367116da7ad31b0bb8588499c7ac85f0fddb6937e151aa503d (from https://www.govinfo.gov/content/pkg/FR-2008-08-11/pdf/E8-18434.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/08/11/E8-18434/airworthiness-directives-dornier-model-328-300-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AFA6B19C41C1858D862574A20051CC9A.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0857

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) that applies to all AvCraft Dornier Model 328-300 airplanes. The existing AD currently requires modifying the electrical wiring of the fuel pumps; installing insulation at the flow control and shut-off valves, and other components of the environmental control system; installing markings at fuel wiring harnesses; replacing the wiring harness of the auxiliary fuel system with a new wiring harness; and installing insulated couplings in the fuel system; as applicable. The existing AD also requires revising the Airworthiness Limitations section of the Instructions for Continued Airworthiness to incorporate new inspections of the fuel tank system. This proposed AD would replace the flight-hour-based threshold for conducting certain initial inspections, with a calendar-based threshold. This proposed AD results from fuel system reviews conducted by the manufacturer. We are proposing this AD to reduce the potentialof 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

- Aug 11, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-18434, comments due Sep 10, 2008 (https://www.federalregister.gov/documents/2008/08/11/E8-18434/airworthiness-directives-dornier-model-328-300-airplanes)

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