(2017) Service Advisory 1685: Conflicting Traffic RA Aural and Visual Alerts

PRODUCTS AFFECTED:
 GTS 8000 units with software version 2.21 and earlier (interfaced to a Garmin GX000 Integrated Flight Deck) are affected.

ISSUE:
 When two Resolution Advisory (RA) aural alerts are triggered in very quick succession, the RA aural alert triggered last may be incorrectly inhibited, causing a conflict between the RA heard and visual RA information displayed on the Instantaneous Vertical Situation Indicator (IVSI).

PILOT ACTION:
 When responding to an RA, always maneuver as indicated by the IVSI, regardless of what aural alert is heard.

 Refer to AC 120-55C for TCAS operational instructions and good operating practices.

RESOLUTION:
 This issue is corrected in GTS 8000 software version 2.22.