# Proposed AD 99-NE-43-AD: Dowty Aerospace Propellers Model R381/6-123-F/5 Propellers

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-18-18
- Action: Notice of proposed rulemaking.
- Published: August 21, 2000, 65 FR 50667
- Comments due: September 20, 2000
- Became: [AD 99-18-18](https://openairdocs.org/ad/99-18-18)
- Docket: 99-NE-43-AD
- FR document: 00-21167
- Official PDF: https://openairdocs.org/files/sha256/85/b5/85b59ddc9e173aede30318eb1350bca318f0b21bab81e1727c9532c790412c38 (from https://www.govinfo.gov/content/pkg/FR-2000-08-21/pdf/00-21167.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/08/21/00-21167/airworthiness-directives-dowty-aerospace-propellers-model-r3816-123-f5-propellers
- Page: https://openairdocs.org/proposed/99-NE-43-AD

## Summary

This document proposes to revise an existing airworthiness directive (AD) that is applicable to Dowty Aerospace Propellers Model R381/6-123-F/5 propellers. That action currently requires initial and repetitive visual and ultrasonic inspections of propeller blades for cracks across the camber face, and, if blades are found cracked, replacement with serviceable blades. This proposed revision would increase the time-in-service (TIS) intervals between required visual and ultrasonic inspections. This proposal is prompted by an engineering analysis of field service data and certification testing that indicate that the repetitive inspection interval can be safely increased. The actions specified in this proposed revision are intended to prevent propeller blade cracks and propagation, which could result in propeller blade separation and possible aircraft loss of control.

## Notices in this docket

- Aug 21, 2000: Notice of proposed rulemaking. (first notice), FR document 00-21167, comments due Sep 20, 2000 (https://www.federalregister.gov/documents/2000/08/21/00-21167/airworthiness-directives-dowty-aerospace-propellers-model-r3816-123-f5-propellers)

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