AD NUMBER: 2006-22-05
MANUFACTURER: Integrated Navigation Unit
SUBJECT: Airworthiness Directive 2006-22-05 SUMMARY: The FAA is
superseding an existing airworthiness directive (AD), which applies
to various aircraft equipped with certain Honeywell Primus II
RNZ-850( )/-851( ) integrated navigation units (INUs). That AD, as
one alternative for compliance, 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, the existing AD
provides for revising the aircraft flight manual to include new
limitations for instrument landing system approaches. This new AD
requires inspecting to determine whether certain 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 results from
reports indicating that erroneous glideslope indications have
occurred on certain aircraft equipped with the subject INUs. We are
issuing this AD to ensure that the flightcrew has an accurate
glideslope deviation indication. An erroneous glideslope deviation
indication could lead to the aircraft making an approach off the
glideslope, which could result in impact with an obstacle or
terrain.
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