S 434-010
(3)
Install the quick-disconnect on the new switch.
S 434-011
(4)
Connect the electrical cable to the switch.
S 434-012
CAUTION: MAKE SURE THE PITOT-STATIC SYSTEM IS AT AMBIENT PRESSURE
_______ BEFORE YOU CONNECT THE PNEUMATIC HOSE. THIS WILL PREVENT DAMAGE TO THE INSTRUMENTS.
(5)
Connect the static hose to switch.
S 754-013
(6)
Visually make sure the quick-disconnect fittings are fully mated and the connection is locked in a sealed position.
S 794-015
(7)
If you installed the quick-disconnect fitting on the new indicator, do a low range leakage test on the alternate static system (AMM 34-11-00/501).
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757
MAINTENANCE MANUAL
S 424-017
CAUTION:_______CAREFULLY PUT THE SWITCH INTO THE BRACKET. THIS WILL PREVENT DAMAGE TO THE CABLE AND PNEUMATIC HOSE AT THE BACK OF THE SWITCH.
(8) Put the switch into position in the bracket and tighten the mounting clamp screws.
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757 MAINTENANCE MANUAL
WARNING SYSTEM - DESCRIPTION AND OPERATION
__________________________________________
1. General (Fig. 1)_______
A. The warning system provides the flight crew with visual and aural warnings. Warnings are provided for abnormal airplane system conditions. They are also provided for airplane out of configuration conditions for various operating modes.
B. The warning system consists of a warning electronics unit, master WARNING switch-lights, discrete warning light, and a SPEEDBRAKE light. It also includes aural warning loudspeakers, an aural cancel switch, and test switches.
C. Input signals are received from airplane sensors, other airplane systems, or generated by the pilots. Signals are processed within the warning electronics unit (WEU).
(1)
The visual displays are level A warning messages on the EICAS display unit (Ref 31-41-00), master WARNING lights, and discrete warning lights.
(2)
The aural signals are the bell, chime, siren, and owl sounds.
2. Component Details (Fig. 1)_________________
A. Warning Electronics Unit (WEU)
(1)
The Warning Electronics Unit (WEU), P51, is located in the forward electrical/electronic equipment area, at station 260, RBL 33.
(2)
The WEU contains plug-in modules which generate warning signals. It generates warning signals for stall warning, configuration warning (takeoff and landing) and altitude alert. It also provides signals to the master warning lights and generates associated warning sounds. The unit weighs 33 lbs and is cooled by external blowing air.
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本文链接地址：757 AMM 飞机维护手册 仪表 CHAPTER 31 - INSTRUMENTS 2(86)
