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General
Mode 3 operates when either of these conditions is true:
* Airplane climbs after going below 245 feet in landing
configuration (gear down, flaps more than 30 units)
* Airplane takes off.
The Mode 3A alerts occur between 1500 feet and 30 feet. The
alert conditions change with the airplane climb rate.
The Mode 3B alerts occur when the airplane altitude is lower
than the altitude value the GPWC stores in a filter. The filter
begins operation during climb at 150 feet and stores 75 percent
of the altitude. The filter stores up to 500 feet altitude for
airspeed less than 190 knots (500 feet in the filter equals an
airplane altitude of 667 feet). When the airspeed goes above 250
knots, the top limit goes to 1000 feet (1000 feet in the filter equals
an airplane altitude of 1333 feet). Mode 3 changes to Mode 4
when the altitude gain filter gets to the upper limits.
These are the LRUs that supply inputs for Mode 3 operation:
* Radio altimeter transceivers
* Left and right ADIRUs
* GPWS module
* Landing gear handle switch
* Stall management yaw damper (SMYD) 1 and 2.
The GPWC uses this data to detect mode 3 alerts:
* Radio altitude
* Inertial altitude
* Inertial vertical speed
* Barometric altitude
* Barometric altitude rate
* Flap angle
* Gear position.
When there is a Mode 3A or Mode 3B condition, the mode
detector sends a discrete to the speech PROM to make the
aural messages. The aural messages go to the REU which
sends them to the flight compartment speakers. Also, when
there is any Mode 3 condition, the mode detector sends a
discrete on an ARINC 429 data bus to the DEUs to show the
warning message.
When the GPWC gives a mode 3 aural message, a discrete
goes to the TCAS computer to inhibit TCAS advisories and
TCAS aural messages.
GPWS - MODE 3 FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Purpose
Mode 4 supplies alerts when the airplane is too close to the
terrain and the landing gear or flaps are not in the landing
configuration (landing configuration for the flaps is 30 units or
greater). Mode 4 has two submodes (4A and 4B).
Description
The GPWC gives a Mode 4A alert when the landing gear is not
down. Mode 4A gives the aural messages TOO LOW GEAR at
low airspeeds, or TOO LOW TERRAIN at high airspeeds.
The GPWC gives a Mode 4B alert when the landing gear is
down and the flaps are not in landing configuration. Mode 4B
gives the aural messages TOO LOW FLAPS if the airplane is at
low airspeed, or TOO LOW TERRAIN at high airspeeds.
When the GPWC gives a Mode 4 alert, the mode detector also
sends a discrete on an ARINC 429 data bus to the DEUs to show
the PULL UP message on the PFD.
GPWS - MODE 4 DESCRIPTION
EFFECTIVITY
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General
Mode 4 alerts occur between 1000 feet and 30 feet. The altitude
limits for mode 4A and mode 4B are lower at low airspeed.
The Mode 4A alert occurs if the landing gear is not down below
the altitude limit. The mode 4A altitude limit is 500 feet when the
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