(2016) Service Bulletin 1623 Rev A: GDL 84/88 Software Upgrade to System Software Version 3.33

PRODUCTS AFFECTED:
 All GDL84/GDL88 units interfaced to a GTN 6XX/7XX, GNS 4XXW/5XXW, GNS 480, GMX 200/MX20, G500, G600, or other 3rd party flight display system are affected.

 GDL 88 units interfaced to a G1000 with GDU software versions 14.XX and earlier are also affected.

CERTIFICATION AUTHORIZATION:
 TSO Authorization

COMPLIANCE:
 Optional

PURPOSE:
 GDL 84/88 System Software Version 3.33 contains the following changes from Version 3.32:

• Added a new interface for third party avionics display integration
• Improved handling of heading data, track data, and target depiction for G1000 installations that use the ADS-B In Legacy Traffic w/Alt interface

NOTE
This change makes sure ADS-B traffic on G1000 displays is depicted at the correct bearing, orientation, and distance.

• Improved ADS-B In traffic prioritization to prioritize in-air targets when not in SURF mode
• Improved ADS-B In own-ship “shadow” detection of TIS-B targets to reduce occurrences of traffic alerts caused by ownship
• Corrected transmitted ADS-B Out NICbaro value for installations with a GX000 or GDU 620 and GTN