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MASTER CAUTION SYSTEM - INTERFACES
MASTER CAUTION SYSTEM - INTERFACES
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Power
The 28v dc battery bus and the 28v dc bus 1 supply power for
the master caution lights and the system annunciator lights.
The 28v dc power goes through switches in the master caution
lights.
The power goes through the annunciation and dimming
module. When you select bright (BRT) on the master lights
control on P1, the voltage is 28 volts. When you select DIM on
the master lights control, the voltage is 16 volts.
Control of the Master Caution Light
The control of the left and right master caution lights come from
these components:
* Flight control panel
* IRS master caution unit
* Flight control panel
* Generator drive and standby power panel
* APU indicator panel
* Overheat/fire protection panel
* Window heat panel
* Hydraulic panel
* System annunciators
* Engine panel
* Flight recorder/Mach airspeed warning panel
* Air conditioning/bleed air control panel.
The annunciation and dimming module receive these discrete
signals. When any one of the discrete signals is at ground, the
annunciation and dimming module sends a master caution
signal (ground) on the control line. This causes both master
caution lights to come on.
The annunciation and dimming module sends the master
caution signal to the flight data acquisition unit.
Control of the System Annunciator Lights
The control of the left system annunciator lights come from
these components:
* Flight control panel (FLT CONT)
* IRS master caution unit (IRS)
* Flight control panel (FUEL)
* Generator drive and standby power panel (ELEC)
* APU indicator panel (APU)
* Overheat/fire protection panel (OVHT/DET).
The control of the right system annunciator lights come from
these components:
* Window heat panel (ANTI-ICE)
* Hydraulic panel (HYD)
* System annunciators (DOORS)
* Engine panel (ENG)
* Flight recorder/Mach airspeed warning panel (OVERHEAD)
* Air conditioning/bleed air control panel (AIR COND).
MASTER CAUTION SYSTEM - INTERFACES - CONTROL
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-52-00-006
Reset of the Master Caution Light
When you push the master caution light, you remove power to
all the master caution circuits. This causes the circuits to reset
the master caution annunciation. These results occur:
* Master caution lights go off
* System annunciator lights go off
* Fault lights on the individual panels remain on if the panel
still senses a fault.
The master caution lights and the system annunciator lights
remain off until a new fault occurs.
When a new fault occurs, these lights come on:
* Fault light on the individual panel which senses the fault
* Master caution lights
* Light on the system annunciator which agrees with the fault.
Recall of the System Annunciator Lights
When you push and hold the system annunciator lights, the
recall signal goes to all the components which cause the lights
on the system annunciators to come on. This causes all the
lights on the system annunciators to come on.
When you release the system annunciator lights, the system
annunciator lights show only the systems which have faults.
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EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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MASTER CAUTION SYSTEM - INTERFACES - CONTROL
MASTER CAUTION SYSTEM - INTERFACES - CONTROL
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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