# Proposed AD FAA-2006-23644: Mitsubishi Heavy Industries MU-2B Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-14-08
- Products: Mitsubishi Heavy Industries
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 9, 2006, 71 FR 6685
- Comments due: March 17, 2006
- Became: [AD 2006-14-08](https://openairdocs.org/ad/2006-14-08)
- Docket: FAA-2006-23644 (https://www.regulations.gov/docket/FAA-2006-23644, where comments are filed)
- Project: 2006-CE-03-AD
- FR document: E6-1769
- Official PDF: https://openairdocs.org/files/sha256/46/67/46676e651b27cbcf384cd4cdcaa639bae9704b61293ca1764638570feb3f8425 (from https://www.govinfo.gov/content/pkg/FR-2006-02-09/pdf/E6-1769.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/02/09/E6-1769/airworthiness-directives-mitsubishi-heavy-industries-mu-2b-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FF5244F69E65E5F5862571100065F937.0001
- Page: https://openairdocs.org/proposed/FAA-2006-23644

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for some Mitsubishi Heavy Industries (MHI) MU-2B series airplanes. This proposed AD would require you to change the flight idle blade angle. This proposed AD results from a recent safety evaluation that used a data-driven approach to analyze the design, operation, and maintenance of the MU-2B series airplanes in order to determine their safety and define what steps, if any, are necessary for their safe operation. Part of that evaluation was the identification of unsafe conditions that exist or could develop on the affected type design airplanes. We are issuing this proposed AD to prevent confusion in blade angle settings. This unsafe condition, if not corrected, could lead to an asymmetric thrust situation in certain flight conditions, which could result in airplane controllability problems.

## Notices in this docket

- Feb 9, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-1769, comments due Mar 17, 2006 (https://www.federalregister.gov/documents/2006/02/09/E6-1769/airworthiness-directives-mitsubishi-heavy-industries-mu-2b-series-airplanes)

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