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are deployed in an unsafe condition. See the speedbrake
control system section for more information about the
SPEEDBRAKES EXTENDED amber light. (SECTION 27-62)
The takeoff warning system turns on the aural warning horn for
an unsafe airplane configuration before takeoff (on ground) or
after takeoff (in air). See the takeoff warning system section for
more information about the takeoff warning system.
(SECTION 31-53)
The door warning system provides indication about the status of
the airplane doors. See the door warning system section for
more information about the door warning. (SECTION 52-71)
Abbreviations and Acronyms
* AACU - antiskid/autobrake control unit
GUN 001-017, 021-099, 101-110, 115, 116, 118
* ACARS - aircraft communications addressing and reporting
system
AIR/GROUND SYSTEM - INTRODUCTION
EFFECTIVITY
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GUN 001-017, 021-099, 101-110, 115, 116, 118 (Continued)
GUN 001-099, 101-118; GUN 201-999 POST SB 737-34-1887
* ADF - automatic direction finder
GUN ALL
* ADIRU - air data inertial reference unit
* altn - alternate
* APU - auxiliary power unit
* ATC - air traffic control
* bat - battery
* BITE - built-in test equipment
* BPCU - bus power control unit
* CB - circuit breaker
* CDS - common display unit
* config - configuration
* DC - direct current
* DFCS - digital flight control system
* DME - distance measuring equipment
* FCC - flight control computer
* FDAU - flight data acquisition unit
* FDRS - flight data recording system
* FMCS - flight management computer system
* FPGA - field programmable gate unit
* FSEU - flap/slat electronics unit
* fwd - forward
* GCU - generator control unit
* gnd - ground
* GRD - ground
* GPWS - ground proximity warning system
* HF - high frequency
* I/O - input/output
* L - left
* IFSAU - integrated flight system accessory unit
GUN 018-099, 111-118
* IGS - Inert Gas System
GUN ALL
* LG - landing gear
* LGTV - landing gear transfer valve
* ILS - instrument landing system
* LRU - line replaceable unit
* MLG - main landing gear
* NLG - nose landing gear
* NWS - nose wheel steering
* PES - passenger entertainment video system
* pri - primary
* PSEU - proximity switch electronics unit
* sec - secondary
* R - right
* RA - radio altimeter
* REF - reference
* SBRK - speedbrake
* SMYD - stall management yaw damper
* sys - system
* sw - switch
* TCAS - traffic collision avoidance system
* TE - trailing edge
* T/O - takeoff
* V - volt
* VHF - very high frequency
* VOR - VHF omnidirectional ranging
* WW - wheel well
* WX - weather radar
AIR/GROUND SYSTEM - INTRODUCTION
EFFECTIVITY
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32-09-00-022
AIR/GROUND SYSTEM - INTRODUCTION
AIR/GROUND SYSTEM - INTRODUCTION
EFFECTIVITY
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Purpose
The air/ground system supplies air mode and ground mode
signals to airplane systems.
Components
These are the air/ground system components:
* Nose landing gear compressed sensors
* Left main landing gear compressed sensors
* Right main landing gear compressed sensors
* Proximity switch electronics unit (PSEU)
* Air/ground relays
* PSEU fault light.
General Description
Two air/ground systems monitor the compression of the landing
gear shock struts.
Two compressed sensors are on each landing gear. One
sensor sends inputs to air/ground system 1 and the other
sensor sends inputs to air/ground system 2.
Sensor signals go to the PSEU. The two air/ground systems in
the PSEU monitor signals from the sensors in their air/ground
system. The PSEU then sends air/ground discrete signals and
signals to operate air/ground relays. Airplane systems use the
air/ground discrete signals and relays for airplane air/ground
inputs.
The amber PSEU light comes on when either air/ground system
is in override mode. The light is also used for fault indication.
　
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