FCS UPDATED Actual EXAM Questions And
CORRECT Answers
What causes Emergency Mode Drift? - CORRECT ANSWERS 3rd Stage LVDTs in the servos not in
a neutral position when the control handles are centered.
In order to use the CITV Stadia Reticle, what 2 functions must be performed? - CORRECT
ANSWERS 1. CITV cannot be in GUN LOS mode
2. NFOV must be selected
Dynamic CANT is provided by what two components? - CORRECT ANSWERS 1. POS/NAV Gyros
2. HTPS (Hull Turret Position Sensor)
What occasions will cause a gun firing inhibit to be generated? - CORRECT ANSWERS 1. A
gun/sight error greater than .25 mils in EL, greater than .25 mils in AZ, or both.
2. In Normal Mode, while conducting a Fire Control System Test or MRS functions are selected.
3. In Emergency Mode when Boresight or Zero functions are selected.
4. If either NORMAL or EMERGENCY autodrift menus are selected.
5. With COAX selected, during target designate operations, until CITV LOS and COAX LOS are within
.25 mils AZ and EL.
How does the FCEU know where the gun is in Elevation? - CORRECT ANSWERS Gun Trunnion
Resolver
The GAS Stadia reticle range LINES are scaled to a ______ full scale target. - CORRECT
ANSWERS 2.3 meter
What signals does the FCEU monitor when designate pushbutton is depressed? - CORRECT
ANSWERS CITV Resolver Network
The GAS Stadia reticle range DOTS are scaled to a ______ turret. - CORRECT ANSWERS .90
meter
,Which two components provide information to the TMPU to determine Dynamic CANT? - CORRECT
ANSWERS 1. POS/NAV Gyros- sense pitch and roll of the tank.
2. H/TPS- determins the position of the turret in relation to the hull.
What is the purpose of the Dual Axis Gyro in the DAHA and CITV-SM? - CORRECT
ANSWERS Provides signals to stabilize the head mirror in EL and AZ.
In normal mode when nulling drift from the CITV, the + or - 15vdc supplied to the CITV-SEU is used to
trim signals going to what components? - CORRECT ANSWERS 1. CITV Torquers
2. Drive Motors
In normal mode, moving the commander's control handle assembly (CCHA) left or right generates an
azimuth rate command which is processed by the _____ and then sent to the FCEU via the _______.
- CORRECT ANSWERS 1. CDU
2. CEU
What are Firing Table Solutions? - CORRECT ANSWERS General ballistic characteristics of a
certain type of ammunition.
What is the purpose of the main accumulator? - CORRECT ANSWERS Maintains constant
hydraulic pressure during short periods of excessive demand and compensates for fluctuations in
pressure to provide smooth and even tracking rates.
What principle does the ELRF work on? - CORRECT ANSWERS The ELRF works on the principle
of transmitting an energy (laser) pulse that reflects off a target. The time required for the laser pulse
to travel to and return from the target is converted to distance (range), which is sent to the MPUs for
ballistic solution calculation.
What is the magnification of the FOV of the GAS? - CORRECT ANSWERS 8X and 8 degrees
What is the purpose of the FCEU in relation to the ballistic computer subsystem? - CORRECT
ANSWERS To interface with various components in the Fire Control System, and send
information to the TMPU for ballistic solution calculation.
What does the TMPU do? - CORRECT ANSWERS Turret Mission Processor Unit:
, It is the controller for the data bus, the monitor for the utility bus, and it also calculates ballistic
solution offsets.
What does the HMPU do? - CORRECT ANSWERS Hull Mission Processor Unit:
Stores the same critical data for the Fire Control System as the TMPU. If the TMPU is unable to
process a ballistic solution, the HMPU will serve as backup.
What does AMMO SUBDES do? - CORRECT ANSWERS AMMO SUBDES tells the MPUs the
particular ballistic coefficient to provide when that type of ammunition is selected at the GPS control
panel.
What does the Fire Control System Test do? - CORRECT ANSWERS Evaluates system response
to pre-determined values.
What is the purpose of the CEU? - CORRECT ANSWERS The electronic link between the CDU
and the rest of the tank.
What is the LRF Wave Length? - CORRECT ANSWERS 1.54 microns
What is the LRF Pulse Energy? - CORRECT ANSWERS 18 millijoules
There are 4 occasions when symbology will display flashing '0000's, what are they? - CORRECT
ANSWERS 1. When all returns are less than 200 meters.
2. When all returns are 8000 meters or greater.
3. When insufficient light is returned to the receiver to calculate a range.
4. When the laser range switch is set to safe or the LRF circuit breaker on the Fire Control CB menu is
off, and the lase button on the power control handle is pressed.
Loss of Effectiveness of the LRF may be due to what? - CORRECT ANSWERS 1. Internal LRF
failure
2. Vehicle Failure
3. Environmental Conditions (Fog, Snow, Heavy Rain)
4. Man-made or Battlefield Obscurants (Smoke)
CORRECT Answers
What causes Emergency Mode Drift? - CORRECT ANSWERS 3rd Stage LVDTs in the servos not in
a neutral position when the control handles are centered.
In order to use the CITV Stadia Reticle, what 2 functions must be performed? - CORRECT
ANSWERS 1. CITV cannot be in GUN LOS mode
2. NFOV must be selected
Dynamic CANT is provided by what two components? - CORRECT ANSWERS 1. POS/NAV Gyros
2. HTPS (Hull Turret Position Sensor)
What occasions will cause a gun firing inhibit to be generated? - CORRECT ANSWERS 1. A
gun/sight error greater than .25 mils in EL, greater than .25 mils in AZ, or both.
2. In Normal Mode, while conducting a Fire Control System Test or MRS functions are selected.
3. In Emergency Mode when Boresight or Zero functions are selected.
4. If either NORMAL or EMERGENCY autodrift menus are selected.
5. With COAX selected, during target designate operations, until CITV LOS and COAX LOS are within
.25 mils AZ and EL.
How does the FCEU know where the gun is in Elevation? - CORRECT ANSWERS Gun Trunnion
Resolver
The GAS Stadia reticle range LINES are scaled to a ______ full scale target. - CORRECT
ANSWERS 2.3 meter
What signals does the FCEU monitor when designate pushbutton is depressed? - CORRECT
ANSWERS CITV Resolver Network
The GAS Stadia reticle range DOTS are scaled to a ______ turret. - CORRECT ANSWERS .90
meter
,Which two components provide information to the TMPU to determine Dynamic CANT? - CORRECT
ANSWERS 1. POS/NAV Gyros- sense pitch and roll of the tank.
2. H/TPS- determins the position of the turret in relation to the hull.
What is the purpose of the Dual Axis Gyro in the DAHA and CITV-SM? - CORRECT
ANSWERS Provides signals to stabilize the head mirror in EL and AZ.
In normal mode when nulling drift from the CITV, the + or - 15vdc supplied to the CITV-SEU is used to
trim signals going to what components? - CORRECT ANSWERS 1. CITV Torquers
2. Drive Motors
In normal mode, moving the commander's control handle assembly (CCHA) left or right generates an
azimuth rate command which is processed by the _____ and then sent to the FCEU via the _______.
- CORRECT ANSWERS 1. CDU
2. CEU
What are Firing Table Solutions? - CORRECT ANSWERS General ballistic characteristics of a
certain type of ammunition.
What is the purpose of the main accumulator? - CORRECT ANSWERS Maintains constant
hydraulic pressure during short periods of excessive demand and compensates for fluctuations in
pressure to provide smooth and even tracking rates.
What principle does the ELRF work on? - CORRECT ANSWERS The ELRF works on the principle
of transmitting an energy (laser) pulse that reflects off a target. The time required for the laser pulse
to travel to and return from the target is converted to distance (range), which is sent to the MPUs for
ballistic solution calculation.
What is the magnification of the FOV of the GAS? - CORRECT ANSWERS 8X and 8 degrees
What is the purpose of the FCEU in relation to the ballistic computer subsystem? - CORRECT
ANSWERS To interface with various components in the Fire Control System, and send
information to the TMPU for ballistic solution calculation.
What does the TMPU do? - CORRECT ANSWERS Turret Mission Processor Unit:
, It is the controller for the data bus, the monitor for the utility bus, and it also calculates ballistic
solution offsets.
What does the HMPU do? - CORRECT ANSWERS Hull Mission Processor Unit:
Stores the same critical data for the Fire Control System as the TMPU. If the TMPU is unable to
process a ballistic solution, the HMPU will serve as backup.
What does AMMO SUBDES do? - CORRECT ANSWERS AMMO SUBDES tells the MPUs the
particular ballistic coefficient to provide when that type of ammunition is selected at the GPS control
panel.
What does the Fire Control System Test do? - CORRECT ANSWERS Evaluates system response
to pre-determined values.
What is the purpose of the CEU? - CORRECT ANSWERS The electronic link between the CDU
and the rest of the tank.
What is the LRF Wave Length? - CORRECT ANSWERS 1.54 microns
What is the LRF Pulse Energy? - CORRECT ANSWERS 18 millijoules
There are 4 occasions when symbology will display flashing '0000's, what are they? - CORRECT
ANSWERS 1. When all returns are less than 200 meters.
2. When all returns are 8000 meters or greater.
3. When insufficient light is returned to the receiver to calculate a range.
4. When the laser range switch is set to safe or the LRF circuit breaker on the Fire Control CB menu is
off, and the lase button on the power control handle is pressed.
Loss of Effectiveness of the LRF may be due to what? - CORRECT ANSWERS 1. Internal LRF
failure
2. Vehicle Failure
3. Environmental Conditions (Fog, Snow, Heavy Rain)
4. Man-made or Battlefield Obscurants (Smoke)
