30-21-00
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MAINTENANCE MANUAL
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MAINTENANCE MANUAL
ACCESS PANEL
ASEE INDICATOR ASSEMBLY TAI DUCT LEAK
FITTING SHROUD DUCT
PROFILE OUTER SKIN
ACCESS PANEL
FWD
PRESSURE INDICATOR
VENT OUTLET ASSEMBLY
TAI DUCT LEAK INDICATOR ASSEMBLY
A
Engine Inlet Cowl TAI Pressure Indicator - Component Location Figure 3
M44394
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(4)
The VALVE light comes on when the position of the TAI valve
disagrees with its commanded position.
(5)
An engine start relay closes the TAI valve when the engine is started (on ground only).
(6)
ENGINES WITH RR SB71-9634; The ducting in the inlet cowl is shrouded (Fig. 3). The shroud prevents damage to the inlet cowl if the duct is damaged. A thermal anti-icing pressure indicator is used to show a duct failure. The indicator has one port connected to the shroud around the duct and one port to ambient pressure. A pressure difference of more than 3 psi (which shows the duct has failed) will operate the indicator. This will cause the indicator to move 0.75 inches (19 mm) out of the inlet cowl.
(7)
An engine bleed control card (EBCC) has inputs from the ANTI-ICE ENGINE L or R switch and high pressure switch. The EBCC provides inputs to the electronic engine control unit for changing engine trim (Ref 73-21-00).
(8)
The ANTI-ICE ENGINE L or R switch also controls standby ignition in case the engine shuts down (Ref 74-31-00).
B. Control
(1)
To place the system in operation, provide electrical power to the 28-v dc battery bus (Ref 24-22-00).
(2)
Pressurize the pneumatic system while the engine operates
(Ref 36-00-00).
(3)
Check that the ENG ANTI-ICE L and R circuit breakers on overhead circuit breaker panel P11-3 are closed.
(4)
To turn on the system, press the L or R ENGINE ANTI-ICE switches to ON position.
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本文链接地址：757 AMM 飞机维护手册 防冰和排雨 CHAPTER 30 - ICE AND RAIN PROTECTION(49)
