TAT probe Left AOA sensor Right AOA sensor Right pitot probe Right ice detector  Center pitot probe Left pitot probe Left ice detector P2/T2 probe 115V AC left XFR bus Pitot probe HTR L 28V DC left main bus Ground heat control relay Air heat control relay Probe heat sensor relay Left pitot probe Probe/vane HTR ctrl L P110 left power management panel NOTE: Left pitot probe heat system shown Right and center systems similar See AOA probe heat 1 1 1 1 On Off AIMS AFDC ADIRU PFC SAARU Flight controls ARINC 629 bus Left pitot ADM Pitot heat indication • Failed On Failed Off In air or > 50 knots On GND and One or both engines on 15-11 Figure 15-15.  Pitot probe heat system.  Figure 15-14.  Probes with thermal electric anti-icing on one commercial airliner.