# Proposed AD 96-CE-45-AD: Mitsubishi Heavy Industries, Ltd., MU- 2B Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 97-04-13
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 30, 1996, 61 FR 55939
- Comments due: January 3, 1997
- Became: [AD 97-04-13](https://openairdocs.org/ad/97-04-13)
- Docket: 96-CE-45-AD
- FR document: 96-27757
- Official PDF: https://openairdocs.org/files/sha256/21/82/21822e6017a10a0267435fb17081718122df511a9b1ba21a124a816ea8af0fc9 (from https://www.govinfo.gov/content/pkg/FR-1996-10-30/pdf/96-27757.pdf)
- Federal Register: https://www.federalregister.gov/documents/1996/10/30/96-27757/airworthiness-directives-mitsubishi-heavy-industries-ltd-mu--2b-series-airplanes
- Page: https://openairdocs.org/proposed/96-CE-45-AD

## Summary

This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Mitsubishi Heavy Industries, Ltd. (Mitsubishi) MU-2B series airplanes. The proposed action would require removing the vent check valve assembly from the bulkhead between the fuel tanks. The proposed action results from an incident where both engines on an affected airplane failed during the end of a flight. The incident is attributed to the fuel filler caps on the top of the wings not sealing correctly. The actions specified by the proposed AD are intended to prevent the inability of both engines to utilize the entire fuel supply because of the outboard fuel not transferring to the center tank, which could result in an uncommanded engine shutdown.

## Notices in this docket

- Oct 30, 1996: Notice of proposed rulemaking (NPRM). (first notice), FR document 96-27757, comments due Jan 3, 1997 (https://www.federalregister.gov/documents/1996/10/30/96-27757/airworthiness-directives-mitsubishi-heavy-industries-ltd-mu--2b-series-airplanes)

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