content_image/593112.jpg
<img src='content_image/593112.jpg'>

With auto or on selected, the operational mode is inhibited if any of these conditions occur: 

• Airplane on the ground (except during an initiated or periodic built-in test equipment (BITE) test) 

• Total Air Temperature (TAT) is more than 50 °F (10 °C) and the time since takeoff is less than 5 minutes 

• Auto slat operation 

• Air-driven hydraulic pump operation 

• Engine start 

• Bleed air temperature less than 200 °F (93 °C). 

The WAI valves stay closed as long as the operational mode inhibit is active. If the valves are already open, the operational mode inhibit causes the valves to close. 

## WAI Indication System 

The aircrew can monitor the WAI system on the onboard computer maintenance page. [Figure 15-13]  The following information is shown: 

• WING MANIFOLD PRESS—pneumatic duct pressure in PSIG 

• VALVE—WAI valve open, closed, or regulating 

• AIR PRESS—pressure downstream of the WAI valves in PSIG 

• AIR FLOW—air flow through the WAI valves in pounds per minute 

## WAI System (BITE) Test 

BITE circuits in the WAI ACIPS computer card continuously monitor the WAI system. Faults that affect the dispatch of the aircraft cause status messages. Other faults cause 

