# Proposed AD FAA-2010-1055: Austro Engine GmbH Model E4 Diesel Piston Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-23-09
- Products: Austro Engine
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 9, 2011, 76 FR 33660
- Comments due: July 25, 2011
- Became: [AD 2010-23-09](https://openairdocs.org/ad/2010-23-09)
- Docket: FAA-2010-1055 (https://www.regulations.gov/docket/FAA-2010-1055, where comments are filed)
- Project: 2010-NE-35-AD
- FR document: 2011-14235
- Official PDF: https://openairdocs.org/files/sha256/90/48/90489b3a970abf05891ff2f7160676b7b686b6f1791ca6d422638bf21abeebac (from https://www.govinfo.gov/content/pkg/FR-2011-06-09/pdf/2011-14235.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/06/09/2011-14235/airworthiness-directives-austro-engine-gmbh-model-e4-diesel-piston-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0271F373F8C44552862578AA0047F298.0001
- Page: https://openairdocs.org/proposed/FAA-2010-1055

## Summary

We propose to supersede an existing airworthiness directive (AD) that applies to the products listed above. The existing AD currently requires frequent inspections of the fuel pressure supply for excessive oscillations to determine if high-pressure fuel pumps have been exposed to damaging pressure oscillations. Pumps that have been exposed require replacement before further flight. Since we issued that AD, Austro Engine, the manufacturer of the pump, introduced a new part number (P/N) fuel pump as mandatory terminating action to the repetitive inspections. This proposed AD would require the initial and repetitive inspections of AD 2010-23-09, but would also require installing HP fuel pump P/N E4A-30-200-000, as mandatory terminating action to the repetitive inspections. We are proposing this AD to prevent engine power loss or in-flight shutdown, which could result in loss of control of the airplane.

## Notices in this docket

- Jun 9, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-14235, comments due Jul 25, 2011 (https://www.federalregister.gov/documents/2011/06/09/2011-14235/airworthiness-directives-austro-engine-gmbh-model-e4-diesel-piston-engines)

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