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A

757
MAINTENANCE MANUAL

 D. Engine Inlet Thermal Anti-Ice (TAI) Ducts
 (1)  
The engine TAI ducts carry engine bleed air along the left side of each engine to the inlet cowls.

 (2)  
ENGINES WITH RR SB71-9634; The ducting includes a thermal anti-icing pressure indicator. This gives a visual indication if the TAI supply duct is defective. An operated pressure indicator will be seen during a pre-flight check.

 E. Wing and Engine Anti-Ice Control Panel
 (1)  The wing and engine anti-ice control panel, M10397, controls the engine inlet thermal anti-icing. Control is provided with two push-on/push-off L and R ENGINE ANTI-ICE switches. The M10397 panel also controls the wing thermal anti-icing. The panel is located on the pilots' overhead panel, P5.
 3.  Operation (Fig. 2)_________
 A. Functional Description
 (1)  
The push-on/push-off L and R ENGINE ANTI-ICE switch/light on the M10397 (P5) panel control the system. Each switch controls one valve. When the switch is pressed the white"ON"light will illuminate to indicate engine anti-icing is selected.

 (2)  
Pressing a L or R ENGINE ANTI-ICE switch/light ON energizes the TAI valve. The amber VALVE light inside the switch/light illuminates. The TAI valve opens to permit bleed air into the anti-ice duct.

 (3)  
When the duct pressure is more than 3-5 psi, the low pressure switch opens and the amber VALVE light goes off.

 NOTE: The ENGINE VALVE light on the wing and engine anti-ice
____ control panel and the EICAS indication can come on when you select anti-ice ON with the engine at ground idle. The lights should go off when you move the power lever to taxi and/or take-off.
 With the anti-ice selected off at a high altitude and a high rate of descent (high mach number), it is possible that the engine VALVE disagree light and the EICAS indication can come on. They should go off when the altitude or airspeed are decreased.
 The anti-ice valve position switch inhibits an engine anti-ice caution message when there is low TAI duct pressure and the nose cowl anti-ice valve is fully open.
 NOTE: RB211-535 SERIES ENGINES WITH RR SB 30-8504;
____ The low pressure switch opens at pproximately 3 psi. RB211-535 SERIES ENGINES WITHOUT RR SB 30-8504, RB211-535 SERIES ENGINES WITH RR SB 30-9534; The low pressure switch opens at pproximately 5 psi.
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本文鏈接地址：757 AMM 飛機維護手冊 防冰和排雨 CHAPTER 30 - ICE AND RAIN PROTECTION(48)