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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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01/27/21

Message Overview:

R WING A/I PRESS HI
(Caution)

DDG Reference: 30-10
Pilot Action (QRH): ICE 12-7
System Description: 30-21-00
Schematic Diagram: 30-12-00
Wiring Diagram: 36-15-03
36-15-01

Message Description:

High pressure has been sensed in the right wing anti-ice system.

Possible Causes:

  • High Pressure Sensor 2 (HPS) (MT20)
  • High Pressure Valve 2 (HPV) (V6)
  • Integrated Air System Controller (IASC2) (A56)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

The amber 'R WING A/I PRESS HI' message indicates high pressure has been sensed in the wing anti-ice system.

  • The IASC has determined that the associated wing system has been over pressurized detected by MT 19 or MT 20 through failure of the wing anti-ice valve.
  • The high pressure transducers are found in the aft equipment compartment, downstream of the HPVs. The sensor is an gauge pressure transducer that can measure pressure from 0 to 75 psig (0 to 517.11 kPa). It is used to monitor the HPV output pressure.
  • Normal regulated pressure is set at 36 psi.
  • Check for MDC message 'R BLEED PRESSURE HI' under HI PRESS VALVE 2 to confirm fault.

Quick Links:

Removal of the High Pressure Valve AMM 36-15-01-000-801
Installation of the High Pressure Valve AMM 36-15-01-400-801
Removal of the High Pressure Sensor AMM 36-15-03-000-801
Installation of the High Pressure Sensor AMM 36-15-03-400-801
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Swap HPSs.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Swap HPVs.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  3. Swap IASCs.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  4. Do wiring checks between HPS 2 and IASC2. Repair as required.
  5. Do close out.

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