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(2023) Service Bulletin 23056 Rev A: GDL 84/88 System Software Version 3.43 and WAAS Software Version 5.3
PRODUCTS AFFECTED:
GDL 84/88 units listed in the table below are affected.
Model | Appliance P/N | Model | Appliance P/N | |
GDL 88 | 011-02369-00 | GDL 84 w/WAAS | 011-03727-00 | |
GDL 88 w/WAAS | 011-02370-00 | GDL 84H w/WAAS | 011-03728-00 | |
GDL 88D | 011-02371-00 | GDL 88 w/WAAS upgrade | 011-02370-40 | |
GDL 88D w/WAAS | 011-02372-00 | GDL 88H w/WAAS upgrade | 011-02370-50 | |
GDL 88H | 011-02369-10 | |||
GDL 88H w/WAAS | 011-02370-10 | |||
GDL 88DH | 011-02371-10 | |||
GDL 88DH w/WAAS | 011-02372-10 |
CERTIFICATION AUTHORIZATION:
TSO Authorization
TSO Authorization does not provide installation airworthiness approval. Separate installation airworthiness approval is required for type-certified aircraft. Notification of revision to any Garmin STC(s) will be provided under a separate service bulletin.
COMPLIANCE:
Recommended: This Service Bulletin is recommended at the next scheduled maintenance interval.
PURPOSE:
GDL 84/88 System Software Version 3.43 provides the following:
- Corrected an issue where some 1090ES ADS-B and ADS-R surface targets may erroneously appear as directional
NOTE
This also provides improved “look-ahead” hover-taxi alerting in rotorcraft.
- Robustness improvements to ADS-B processing.
WAAS Software Version 5.3 (if applicable) fixes a GPS date problem beginning August 16, 2020. The GDL 84/88 may report an incorrect GPS date if the GPS receiver has not acquired a 3D navigation solution within the last 128 weeks.
WARRANTY INFORMATION:
This modification is warranty reimbursable with a deadline of November 30, 2023.