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conditions occurs:
* DFCS is in BITE
* The foreign FCC part number is invalid
* The power up test fails on the ground
* The MCP bus fails when the airplane is in A/P pitch G/A
* The airplane is above 400 feet and cannot exit A/P G/A to
altitude acquire because single channel pitch authority is not
available
* The stab out of trim warning is set and the airplane is in dual
pitch A/P below 800 feet.
The red A/T annunciator flashes when the A/T disengages. The
red A/T annunciator comes on steady when the A/T is in BITE.
The amber A/T flashes when the A/T is in the MCP or FMC SPD
mode and the FCC calculates an A/T speed warning. The speed
warning occurs when the true airspeed is 10 knots above the
target speed or 5 knots below the target speed and is not
accelerating to the target speed. The flaps must be down for the
warning to occur.
DFCS - AUTOFLIGHT STATUS ANNUNCIATOR
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Training Information Point
Each warning light indicator has four filament lamps. You do not
have to remove the ASA to replace the lamps. Pull the front cap
out and hold it down to get access to the lamps.
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EFFECTIVITY
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DFCS - AUTOFLIGHT STATUS ANNUNCIATOR
DFCS - AUTOFLIGHT STATUS ANNUNCIATOR
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General
The autoflight status annunciator has these functions:
* Autopilot (A/P) system annunciations
* Autothrottle (A/T) system annunciations
* Flight management computer system (FMCS) annunciations.
A/P System Annunciations
A ground signal can turn on the red or the amber A/P
annunciator lights. When you push the A/P annunciator, a reset
signal goes from the annunciator to the FCCs and the mode
control panel (MCP). This also turns off the A/P annunciator if it
flashes red or flashes amber.
A/T System Annunciations
A ground signal can turn on the red or the amber A/T
annunciator lights. When you push the A/T annunciator, a reset
signal goes from the annunciator to the FCCs and the A/T
computer. This also turns off the A/T annunciator if it flashes red
or flashes amber.
FMCS Annunciations
A ground signal can turn on the amber FMC annunciator light.
Either an FMC failure or an FMC alert message sets one logic
circuit in the annunciator. This turns on an electronic switch
which sends a ground to the FMC amber light. This keeps the
amber light on. When you push the FMC annunciator, a reset
signal goes to the logic circuit and resets it so that the light goes
off.
Test Switch
When the test switch is in the number 1 position, a ground goes
to the A/P and A/T amber lights. A ground also goes to the FMC
message logic circuit to turn on the electronic switch. This does
a test of the amber lights.
When the test switch is in the number 2 position, a ground goes
to the A/P and A/T red lights. A ground also goes to the FMC fail
logic circuit to turn on the electronic switch. This does a test of
the red A/P and A/T lights and the amber FMC lights.
DFCS - AUTOFLIGHT STATUS ANNUNCIATOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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DFCS - AUTOFLIGHT STATUS ANNUNCIATOR - FUNCTIONAL DESCRIPTION
DFCS - AUTOFLIGHT STATUS ANNUNCIATOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Purpose
The purpose of the integrated flight system accessory unit
(IFSAU) is to give an interface between the DFCS and the
airplane systems.
Physical Description
The IFSAU is a 3 MCU box. It uses a single camloc-type hold
down handle to carry the unit and to connect it in the E-1 rack.
There are four electrical connectors on the back of the IFSAU.
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