*
Corrective action RA.

Preventative Action RA
This type of RA occurs when at the closest point of approach (CPA) the vertical speed results in a safe altitude separation from the threat airplane. When this happens the aural advisory is MONITOR VERTICAL SPEED -MONITOR VERTICAL SPEED. This message tells the flight crew to:
*
Maintain the flight path

*
Do not fly into the area of RA pitch symbol on the PFD

*
Maintain the vertical speed rate.

EFFECTIVITY
BEJ ALL

Corrective Action RA
This type of RA occurs when the altitude separation at the CPA is not safe. These RA aural advisories tell the flight crew to take corrective action to avoid a possible collision:
BEJ 001-005
* CLIMB -CLIMB -CLIMB. The flight crew must climb at a rate to avoid the preventative down advisories.
BEJ 006-999
* CLIMB -CLIMB. The flight crew must climb at a rate to avoid the preventative down advisories.
BEJ ALL
*
CLIMB CROSSING CLIMB -CLIMB CROSSING CLIMB. The flight crew must climb at a rate to avoid the preventative down advisories. The flight path crosses through the flight path of the threat.

*
REDUCE CLIMB -REDUCE CLIMB. The flight crew must reduce the rate of climb to avoid the preventative up advisories.

BEJ 001-005
* DESCEND -DESCEND -DESCEND. The flight crew must descend at a rate to avoid the preventative up advisories.
BEJ 006-999
* DESCEND -DESCEND. The flight crew must descend at a rate to avoid the preventative up advisories.
BEJ ALL
* DESCEND CROSSING DESCEND -DESCEND CROSSING DESCEND. The flight crew must descend at a rate to avoid the preventative up advisories. The flight path crosses through the flight path of the threat.
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TCAS -AURAL MESSAGES

* REDUCE DESCENT -REDUCE DESCENT. The flight crew must reduce the rate of descent to avoid the preventative up advisories.
BEJ 006-999
*
ADJUST VERTICAL SPEED -ADJUST. The flight crew must adjust vertical speed to avoid the preventative up or down advisories.

*
MAINTAIN VERTICAL SPEED -MAINTAIN. The flight crew must remain at their current vertical speed to avoid the preventative up or down advisories.

BEJ ALL
Increase Corrective Action RA
This type of RA tells the flight crew to increase the corrective maneuvers because the changes in the threat airplane maneuvers:
*
INCREASE CLIMB -INCREASE CLIMB. This follows the CLIMB advisory when the threat airplane maneuver changes to tell the flight crew to increase the rate of climb.

*
INCREASE DESCENT -INCREASE DESCENT. This follows the DESCEND advisory when the threat airplane maneuver changes to tell the flight crew to increase the rate of descent.

*
CLIMB, CLIMB NOW -CLIMB, CLIMB NOW. This follows the DESCEND advisory when a climb is necessary to give safe vertical separation at CPA.

*
DESCEND, DESCEND NOW -DESCEND, DESCEND NOW. This follows the CLIMB advisory when a descent is necessary to give safe vertical separation at CPA.

Clear of Conflict
When the range of the threat airplane that causes an RA increases, the aural message CLEAR OF CONFLICT comes on.
EFFECTIVITY BEJ ALL  34-45-00 
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777 AIRCRAFT MAINTENANCE MANUAL

TCAS -AURAL MESSAGES

EFFECTIVITY BEJ 001-005  34-45-00 
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777 AIRCRAFT MAINTENANCE MANUAL

TCAS -AURAL MESSAGES

EFFECTIVITY BEJ 006-999  34-45-00 
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Page 43 D633W101-BEJ Jan 05/2002

TCAS -TCAS COMPUTER -FUNCTIONAL DESCRIPTION

General
The TCAS computer receives replies from other airplanes and gets many analog and digital inputs. The TCAS computer uses these reply inputs to calculate if an airplane is a collision threat. The TCAS computer sends display data to the AIMS cabinets. Also, the TCAS transmits data to other airplane that have TCAS. The other TCAS airplane uses the transmitted data to coordinate maneuvers between the airplanes to avoid a collision.
The TCAS computer has these circuits:
*
Input/output (I/O)

*
Voice output

*
Central processing unit (CPU) and memory

*
BITE

*
Suppression

*
Signal Processor

*
　
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