AD 77-16-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mitchell Industries, Inc. | Navigation Systems | Airworthiness Directives; EDO-AIRE MITCHELL: Applies to Model NSD-360 Navigation Systems |
Unsafe Condition
The use of VOR/LOC converters other than the Edo-Aire Mitchell 1C707 and 1C707-1 converters with the NSD-360 Navigation Systems may result in an unreliable primary VOR display for IFR navigation, compromising navigation accuracy and safety.
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Required Actions
Install a placard stating 'NSD-360 NOT APPROVED AS PRIMARY VOR DISPLAY FOR IFR NAVIGATION PRIOR TO COMPLIANCE WITH EAM MB-13' near the affected navigation situation display. The placard must be replaced with EAM placard P/N 13A895 and install EAM NAV Flag Adapter P/N 1C775 as per Service Bulletin MB-13 within 50 hours in service.
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Compliance Time
within the next 50 hours in service after the effective date of this AD
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Affected Aircraft
EDO-AIRE MITCHELL Model NSD-360 Navigation Systems with Navigation Situation Display instruments 52D136-0020, 52D136-0120, 52D136-0220, 52D136-1020, 52D136-1120, 52D136-1220, 52D137-1020, 52D137-1120, or 52D137-1220 when used with non-compliant VOR/LOC converters.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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