Which Emergency Procedure corresponds to complete loss of audio across all stations, VOX inoperative on all stations, and ICU failed light on all LPCAPs?

• A. SFI Failure
• B. ICU Failure
• C. Hydraulic Indicating System Failure
• D. LPCAP Failure

Answer: (B)

The situation points to a centralized intercommunication fault. The Intercommunication Control Unit handles all audio distribution and VOX control across every station. If that unit fails, you’d expect complete loss of audio at every crew station, VOX would be inoperative everywhere, and the ICU fault indicator would light on all LPCAP panels since they all monitor the same ICU status. That combination of symptoms—global audio loss, VOX inoperability on every station, and ICU fault indication across all panels—best matches an ICU Failure emergency procedure.

The other issues don’t fit this cluster: a failure of flight instruments wouldn’t cause a city-wide audio outage; a hydraulic indicating system failure affects hydraulic indicators, not audio or VOX; a LPCAP failure could affect one or a subset of panels and wouldn’t produce a universal ICU fault indication across all LPCAPs.