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ENGINE ANTI-ICE -FUNCTIONAL DESCRIPTION
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ENGINE ANTI-ICE -OPERATION
General
The engine anti-ice selectors let the flight crew select the operational mode independently for each engine. Indications on the EICAS display and on the air synoptic display show when the EAI valves are open.
Operation
The selectors are on the anti-ice/lighting panel (P5). With the selector set to OFF, the EAI system does not operate. The EAI valve stays closed. The EICAS caution message ICING ENG shows if the airplane is in the air and the ice detection system finds ice. The OFF selection prevents the EAI BITE periodic ground test.
The AUTO positions enable the BITE periodic ground test. In flight, when the EAI selector is in AUTO, engine anti-ice system operation is automatic. The ice detection system controls engine anti-ice system operation as long as operational mode inhibits are not active.
For manual operation, the crew sets the selectors to ON when engine anti-ice is necessary. The EAI valves stay open as long as no operational mode inhibits are active. The EICAS advisory message ANTI-ICE ON shows if all of these conditions occur:
*
Airplane is in the air
*
The left or right EAI selector is set to ON
*
No ice is detected
* TAT is more than 50F (10C).
The selectors must be ON for the EAI system to operate on the ground.
See the ice detection system for more information about the ice detectors (SECTION 30-81).
Air Synoptic Display
The EAI valve symbols show these conditions:
*
Valve open -white circle with a vertical green flow bar
*
Valve closed -white circle with two horizontal white bars
*
Valve not in commanded position -amber circle with an amber cross through it
*
Valve position data not available -white circle.
Non-Normal Indications
These EICAS messages (not shown) show non-normal conditions:
*
ANTI-ICE LEAK ENG L,R (Caution) -The fan case overheat detector signals a duct leak condition
*
ANTI-ICE LOSS ENG L,R (Advisory) -The EAI valve closes because of a duct leak
*
ANTI-ICE ENG L,R (Advisory) -The EAI valve fails closed.
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ENGINE ANTI-ICE -OPERATION
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ENGINE ANTI-ICE -SYSTEM TESTS
General
These are the engine anti-ice system tests that show when you select ATA 30 Airfoil Cowl Ice Protection System:
*
Left engine anti-ice (engine running)
*
Left engine anti-ice (engine not running)
*
Right engine anti-ice (engine running)
*
Right engine anti-ice (engine not running).
Left and Right Engine Anti-Ice (Engine Running)
These tests make sure that the related engine anti-ice system can control the bleed airflow.
During the test, you must operate the related engine. The tests each take approximately 1-2 minutes.
Left and Right Engine Anti-Ice (Engine Not Running)
This test makes sure that the electrical interface connections of the related engine anti-ice system are correct, and that the related ice detector operates correctly.
The tests each take approximately 1-2 minutes.
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ENGINE ANTI-ICE -SYSTEM TESTS
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
PITOT AND STATIC (AIR DATA SENSORS) -INTRODUCTION
General
Some probes and sensors have heaters to keep ice off, so their data is reliable. The static system does not have any heaters. These are the probes and sensors that have heaters:
*
Left, right, and center pitot probes
*
Total air temperature (TAT) probe
*
Left and right angle of attack (AOA) sensors
*
Left and right engine P2/T2 probes.
The pitot air data modules (ADMs) control the heat for the pitot probes and the AOA sensors. The heater in the pitot probes and AOA sensors operate when any of these conditions occur:
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