Airworthiness directives › 2021-08-07
AD 2021-08-07 Airworthiness Directives; Rockwell Collins, Inc., Global Positioning Systems
Applicability*9
This AD applies to Rockwell Collins, Inc. GPS-4000S Global Positioning System (GPS) part number (P/N) 822-2189-100 installed on airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 24 months replace each GPS-4000S GPS P/N 822-2189-100 with a GPS that does not have P/N 822-2189-100. (2) As of 24 months after the effective date of this AD, do not install GPS-4000S GPS P/N 822-2189-100 on any airplane.
Unsafe condition
This AD was prompted by an un-annunciated GPS vertical error that could result in a hazardously misleading localizer performance vertical (LPV) glidepath. The FAA is issuing this AD to prevent a misleading GPS position on an LPV approach. The unsafe condition, if not addressed, could result in a misleading GPS position on an LPV approach resulting in controlled flight into terrain.
Affected ADs
None.
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