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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-46-00-012
GPWS - MODE 2B DESCRIPTION
GPWS - MODE 2B DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-46-00-012
General
Mode 2A annunciations occur between 1650 feet radio altitude
and 30 feet radio altitude for airspeed less than 220 knots. The
top limit increases to 2450 feet radio altitude for airspeed
between 220 knots and 310 knots.
Mode 2B annunciations can occur between 789 feet radio
altitude and 30 feet radio altitude. The lower limit is between 30
feet and 600 feet radio altitude. The GPWC uses flap
configuration and altitude descent rate to calculate the lower
limit.
These are the LRUs that supply inputs for mode 2 operation:
* Left and right radio altimeter transceivers
* Left and right ADIRUs
* GPW module
* Stall management yaw dampers (SMYDs)
SHZ 001-003
* Multi-mode receiver (MMR) 1
SHZ 009-999
* Multi-mode receiver (MMR) 1 and 2
SHZ ALL
* Proximity switch electronic unit (PSEU).
This is the data the GPWC uses to detect mode 2 alerts and
warnings:
* Radio altitude
* Inertial vertical speed (IVS)
* Barometric altitude rate
* Barometric altitude
* Computed airspeed
* Flap and gear position
* Glideslope deviation
* Air/ground inputs.
When there is an alert condition or warning condition, the mode
detector sends a discrete to the speech prom to make the aural
messages come on. The aural messages go to the REU which
sends them to the flight compartment speakers.
When there is a mode 2 warning condition, the mode detector
also sends a signal on the ARINC 429 transmitter to the DEUs
and the PULL UP message shows on the PFD.
When the GPWC gives a mode 2 aural message, a discrete
goes to the TCAS computer to inhibit TCAS resolution
advisories and TCAS aural messages.
GPWS - MODE 2 FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-SHZ1 Oct 10/2003
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-46-00-013
GPWS - MODE 2 FUNCTIONAL DESCRIPTION
GPWS - MODE 2 FUNCTIONAL DESCRIPTION
EFFECTIVITY
SHZ 001-003 34-46-00
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D633A101-SHZ1 Jun 10/2003
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-46-00-013
GPWS - MODE 2 FUNCTIONAL DESCRIPTION
GPWS - MODE 2 FUNCTIONAL DESCRIPTION
EFFECTIVITY
SHZ 009-999 34-46-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-46-00-013
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GPWS - MODE 2 FUNCTIONAL DESCRIPTION
34-46-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
Mode 3 supplies alerts for a large altitude loss during takeoff or
during a missed approach with the flaps not in the landing
configuration (landing configuration for the flaps is 30 units or
more) or landing gear not down. Mode 3 has two submodes (3A
and 3B). After the airplane gets to 1500 feet radio altitude, Mode
3 is not armed. When Mode 3 is not armed, Mode 4 is armed.
Description
Submode 3A gives an alert when the airplane loses too much
inertial altitude after takeoff. The amount of inertial loss
depends on the climb rate and radio altitude of the airplane.
Submode 3A gives the aural message, DONT SINK.
Submode 3B gives an alert for minimum terrain clearance. The
minimum terrain clearance increases with radio altitude during
takeoff and climb. Submode 3B gives the aural message, TOO
LOW TERRAIN.
When there is a GPWS mode 3 alert, the PFD shows the
message, PULL UP.
GPWS - MODE 3 DESCRIPTION
EFFECTIVITY
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GPWS - MODE 3 DESCRIPTION
GPWS - MODE 3 DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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