MANUFACTURER: Various Aircraft Equipped With Honeywell
Primus II RNZ-850( )/-851( ) Integrated Navigation Units SUBJECT: Airworthiness Directive 2010-07-02
SUMMARY: The FAA is superseding an existing
airworthiness directive (AD) that applies to certain Honeywell
Primus II RNZ-850( )/-851( ) integrated navigation units (INUs). As
one alternative for compliance, the existing AD provides for a
one-time inspection to determine whether a certain modification has
been installed on the Honeywell Primus II NV-850 navigation
receiver module (NRM), which is part of the INU. In lieu of
accomplishing this inspection, and for aircraft found to have an
affected NRM, that AD provides for revising the aircraft flight
manual to include new limitations for instrument landing system
approaches. That AD also requires an inspection to determine
whether certain other modifications have been done on the NRM; and
doing related investigative, corrective, and other specified
actions, as applicable; as well as further modifications to address
additional anomalies. This AD extends the compliance time for a
certain inspection and associated actions. This AD also revises the
applicability to include additional affected INUs. This AD results
from reports indicating that erroneous localizer and glideslope
indications have occurred on certain aircraft equipped with the
subject INUs. We are issuing this AD to ensure that the flightcrew
has accurate localizer and glideslope deviation indications. An
erroneous localizer or glideslope deviation indication could lead
to the aircraft making an approach off the localizer, which could
result in impact with an obstacle or terrain.
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