A-86-133
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: ISSUE AN AIRWORTHINESS DIRECTIVE REQUIRING PERIODIC INSPECTION, SERVICING, AND TESTING OF BENDIX M-4 AUTOPILOT SYSTEMS INSTALLED IN MITSUBISHI MU-2 AIRPLANES. COMPLIANCE WITH THIS REQUIREMENT SHOULD INCLUDE SCHEDULED REPLACEMENT OF VITAL AUTOPILOT MECHANICAL ACCESSORIES SUCH AS SERVO MOTORS, ELECTROMAGNETIC CLUTCHES, AND CLUTCH BRUSH ASSEMBLIES IN ACCORDANCE WITH THE MANUFACTURERS' MAINTENANCE RECOMMENDATIONS.
In plain language (FlightFinder summary)
The FAA is asked to issue an airworthiness directive that mandates periodic inspection, servicing, and testing of Bendix M-4 autopilot systems installed in Mitsubishi MU-2 airplanes, including scheduled replacement of critical mechanical parts like servo motors, electromagnetic clutches, and clutch brush assemblies as per manufacturer recommendations.
This plain-language summary is written by FlightFinder to explain the recommendation above. It is not the official wording — the verbatim NTSB text is quoted above.
Details
| Status | Closed - Unacceptable Action |
|---|---|
| Mode | Aviation |
| Closed | Feb 28, 1989 |
| NTSB number | FTW86MA097 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).