Service Letter MTL-34-01: Navigation –
GPS-4000S Global Positioning System Software Update
Issued: May 14, 2020
Effectivity: Beechcraft King Air 90 Series, serial numbers LJ-2151 through LJ-2173; Super King Air B200GT, serial numbers BY-324 through BY-379; Super King Air B300, serial numbers FL-1140 through FL-1222; and Super King Air B300/B300C, serial numbers FM-76 through FM-85
Reason: To correct an anomaly with the UTC Time offset issue starting the week of June 11, 2023, in the Global Navigation Satellite System (GNSS) software of the GPS-4000S, CPN 822-2189-100. The LRU will not support Localizer Performance Vertical (LPV) approaches in the impacted region of +/- 20 degrees around 180 Degrees West Longitude.
Compliance – Recommended: This service document should be accomplished at a scheduled maintenance period or inspection.
Warranty: Eligible airplanes may qualify for parts and labor coverage to the extent noted in the Labor Hours and Material Availability sections of the document (posted in its entirety online at www.txtavsupport.com).
The information provided in this column may be abbreviated for space purposes. For the entire communication, go to www.txtavsupport.com.