A320-family/Systems/a320-fuel.xml

<?xml version="1.0"?>

<!-- Airbus A320 Fuel -->
<!-- Copyright (c) 2019 Jonathan Redpath -->

<system name="A320: Fuel:">
	
	<channel name="Fuel Pumps and Valves" execrate="8">
		<!-- Pumps -->
		
		<switch name="/systems/fuel/pumps/apu-operate"> <!-- DC HOT 1 ? -->
			<default value="0"/>
			<test logic="AND" value="1">
				/systems/fuel/pumps/all-eng-pump-off eq 1
				<test logic="OR">
					/systems/electrical/bus/ac-ess-shed ge 110 <!-- TODO 2QC breaker -->
					/systems/electrical/bus/ac-si-bus ge 110 <!-- TODO 1QC breaker -->
				</test>
			</test>
		</switch>
		
		<switch name="/systems/fuel/pumps/wing-pump-left-1-operate">
			<default value="0"/>
			<test logic="AND" value="1">
				/controls/fuel/switches/pump-left-1 eq 1
				/systems/failures/fuel/left-tank-pump-1 ne 1
				<test logic="OR">
					<test logic="AND">
						/systems/electrical/sources/idg-1/pmg-volt ge 110
						/controls/electrical/switches/gen-1-line-contactor eq 1
					</test>
					/systems/electrical/bus/ac-1 ge 110
				</test>
			</test>
		</switch>
		
		<switch name="/systems/fuel/pumps/wing-pump-left-2-operate">
			<default value="0"/>
			<test logic="AND" value="1">
				/systems/failures/fuel/left-tank-pump-2 ne 1
				/controls/fuel/switches/pump-left-2 eq 1
				/systems/electrical/bus/ac-2 ge 110
			</test>
		</switch>
		
		<switch name="/systems/fuel/pumps/wing-pump-right-1-operate">
			<default value="0"/>
			<test logic="AND" value="1">
				/controls/fuel/switches/pump-right-1 eq 1
				/systems/failures/fuel/right-tank-pump-1 ne 1
				<test logic="OR">
					<test logic="AND">
						/systems/electrical/sources/idg-1/pmg-volt ge 110
						/controls/electrical/switches/gen-1-line-contactor eq 1
					</test>
					/systems/electrical/bus/ac-1 ge 110
				</test>
			</test>
		</switch>
		
		<switch name="/systems/fuel/pumps/wing-pump-right-2-operate">
			<default value="0"/>
			<test logic="AND" value="1">
				/systems/failures/fuel/right-tank-pump-2 ne 1
				/controls/fuel/switches/pump-right-2 eq 1
				/systems/electrical/bus/ac-2 ge 110
			</test>
		</switch>
			
		<fcs_function name="/systems/fuel/internal/left-inner-tank-underfull-level">
			<function>
				<difference>
					<property>/consumables/fuel/tank[1]/capacity-gal_us</property>
					<value>106.197</value>
				</difference>
			</function>
		</fcs_function>
			
		<fcs_function name="/systems/fuel/internal/right-inner-tank-underfull-level">
			<function>
				<difference>
					<property>/consumables/fuel/tank[3]/capacity-gal_us</property>
					<value>106.197</value>
				</difference>
			</function>
		</fcs_function>
		
		<switch name="/systems/fuel/left-inner-full">
			<default value="0"/>
			<test logic="AND" value="1">
				/systems/fuel/left-inner-full eq 1
				/consumables/fuel/tank[1]/level-norm lt 0.999
				/consumables/fuel/tank[1]/level-gal_us ge /systems/fuel/internal/left-inner-tank-underfull-level
			</test>
			<test value="1">
				/consumables/fuel/tank[1]/level-norm gt 0.999
			</test>
		</switch>
		
		<switch name="/systems/fuel/right-inner-full">
			<default value="0"/>
			<test logic="AND" value="1">
				/systems/fuel/right-inner-full eq 1
				/consumables/fuel/tank[3]/level-norm lt 0.999
				/consumables/fuel/tank[3]/level-gal_us ge /systems/fuel/internal/right-inner-tank-underfull-level
			</test>
			<test value="1">
				/consumables/fuel/tank[3]/level-norm gt 0.999
			</test>
		</switch>
		
		<switch name="/systems/fuel/pumps/center-pump-1-operate">
			<default value="0"/>
			<test logic="AND" value="1">
				/systems/failures/fuel/center-tank-pump-1 ne 1
				/controls/fuel/switches/pump-center-1 eq 1
				<test logic="OR">
					/controls/fuel/switches/center-mode eq 0
					<test logic="AND">
						/systems/fuel/pumps/center-control-low-level ne 1
						<test logic="OR">
							/systems/fuel/ctr-pump-cmd-on-eng-start eq 1
							<test logic="AND">
								fcs/slat-pos-deg lt 16
								/systems/fuel/left-inner-full ne 1
							</test>
						</test>
					</test>
				</test>
				/systems/electrical/bus/ac-1 ge 110
			</test>
		</switch>
		
		<switch name="/systems/fuel/pumps/center-pump-2-operate">
			<default value="0"/>
			<test logic="AND" value="1">
				/controls/fuel/switches/pump-center-2 eq 1
				/systems/failures/fuel/center-tank-pump-2 ne 1
				<test logic="OR">
					/controls/fuel/switches/center-mode eq 0
					<test logic="AND">
						/systems/fuel/pumps/center-control-low-level ne 1
						<test logic="OR">
							/systems/fuel/ctr-pump-cmd-on-eng-start eq 1
							<test logic="AND">
								fcs/slat-pos-deg lt 16
								/systems/fuel/left-inner-full ne 1
							</test>
						</test>
					</test>
				</test>
				/systems/electrical/bus/ac-2 ge 110
			</test>
		</switch>
		
		<switch name="/systems/fuel/pumps/all-eng-pump-off">
			<default value="0"/>
			<test logic="AND" value="1">
				/systems/fuel/pumps/wing-pump-left-1-operate eq 0
				/systems/fuel/pumps/wing-pump-left-2-operate eq 0
				/systems/fuel/pumps/wing-pump-right-1-operate eq 0
				/systems/fuel/pumps/wing-pump-right-2-operate eq 0
				/systems/fuel/pumps/center-pump-1-operate eq 0
				/systems/fuel/pumps/center-pump-2-operate eq 0
			</test>
		</switch>
		
		<switch name="/systems/fuel/quantity/left-wing-inner-low">
			<default value="0"/>
			<test value="1">
				propulsion/tank[1]/contents-lbs le 1650
			</test>
		</switch>
		
		<switch name="/systems/fuel/quantity/center-low">
			<default value="0"/>
			<test value="1">
				propulsion/tank[2]/contents-lbs le 220
			</test>
		</switch>
		
		<switch name="/systems/fuel/quantity/right-wing-inner-low">
			<default value="0"/>
			<test value="1">
				propulsion/tank[3]/contents-lbs le 1650
			</test>
		</switch>
		
		<actuator name="/systems/fuel/pumps/center-control-low-level">
            <input>/systems/fuel/quantity/center-low</input>
            <rate_limit sense="decr">120</rate_limit> <!-- Instant -->
            <rate_limit sense="incr">0.00333</rate_limit> <!-- 300 seconds -->
        </actuator>
		
		<!-- Valves -->
		<switch name="/systems/fuel/valves/outer-inner-transfer-valve-1-cmd">
			<default value="0"/>
			<test logic="AND" value="1">
				/systems/fuel/valves/outer-inner-transfer-valve-1-cmd eq 1
				/systems/fuel/refuel/refuelling eq 0
			</test>
			<test logic="AND" value="1">
				/systems/fuel/valves/outer-inner-transfer-valve-1-power ne 0
				<test logic="OR">
					/systems/fuel/quantity/left-wing-inner-low eq 1
					/systems/fuel/quantity/right-wing-inner-low eq 1
				</test>
				/systems/fuel/refuel/refuelling eq 0
			</test>
		</switch>
		
		<switch name="/systems/fuel/valves/outer-inner-transfer-valve-1-power">
			<default value="0"/>
			<test logic="OR" value="0.333">
				/systems/electrical/bus/dc-ess-shed ge 25
				/systems/electrical/bus/dc-2 ge 25
			</test>
		</switch>
		
		<actuator name="/systems/fuel/valves/outer-inner-transfer-valve-1">
			<input>/systems/fuel/valves/outer-inner-transfer-valve-1-cmd</input>
			<rate_limit>/systems/fuel/valves/outer-inner-transfer-valve-1-power</rate_limit>
		</actuator>
		
		<switch name="/systems/fuel/valves/outer-inner-transfer-valve-2-cmd">
			<default value="0"/>
			<test logic="AND" value="1">
				/systems/fuel/valves/outer-inner-transfer-valve-2-cmd eq 1
				/systems/fuel/refuel/refuelling eq 0
			</test>
			<test logic="AND" value="1">
				/systems/fuel/valves/outer-inner-transfer-valve-2-power ne 0
				<test logic="OR">
					/systems/fuel/quantity/left-wing-inner-low eq 1
					/systems/fuel/quantity/right-wing-inner-low eq 1
				</test>
				/systems/fuel/refuel/refuelling eq 0
			</test>
		</switch>
		
		<switch name="/systems/fuel/valves/outer-inner-transfer-valve-2-power">
			<default value="0"/>
			<test logic="OR" value="0.333">
				/systems/electrical/bus/dc-ess-shed ge 25
				/systems/electrical/bus/dc-2 ge 25
			</test>
		</switch>
		
		<actuator name="/systems/fuel/valves/outer-inner-transfer-valve-2">
			<input>/systems/fuel/valves/outer-inner-transfer-valve-2-cmd</input>
			<rate_limit>/systems/fuel/valves/outer-inner-transfer-valve-2-power</rate_limit>
		</actuator>
		
		<!-- XFeed Valve -->
		<switch name="/systems/fuel/valves/crossfeed-valve-cmd">
			<default value="0"/>
			<test value="1">
				/controls/fuel/switches/crossfeed eq 1
			</test>
		</switch>
		
		<switch name="/systems/fuel/valves/crossfeed-valve-power">
			<default value="0"/>
			<test logic="OR" value="0.5">
				/systems/electrical/bus/dc-2 ge 25
				/systems/electrical/bus/dc-ess-shed ge 25
			</test>
		</switch>
		
		<actuator name="/systems/fuel/valves/crossfeed-valve">
			<input>/systems/fuel/valves/crossfeed-valve-cmd</input>
			<rate_limit>/systems/fuel/valves/crossfeed-valve-power</rate_limit>
		</actuator>
		
		<!-- Engine LP Valves -->
		<switch name="/systems/fuel/valves/engine-1-lp-valve-cmd">
			<default value="0"/>
			<test logic="AND" value="1">
				/controls/engines/engine[0]/fire-btn eq 0
				/engines/engine[0]/state ge 1
			</test>
		</switch>
		
		<switch name="/systems/fuel/valves/engine-1-lp-valve-power">
			<default value="0"/>
			<test logic="OR" value="1.0">
				/systems/electrical/bus/dc-ess-shed ge 25
				/systems/electrical/bus/dc-2 ge 25
			</test>
		</switch>
		
		<actuator name="/systems/fuel/valves/engine-1-lp-valve">
			<input>/systems/fuel/valves/engine-1-lp-valve-cmd</input>
			<rate_limit>/systems/fuel/valves/engine-1-lp-valve-power</rate_limit>
		</actuator>
		
		<switch name="/systems/fuel/valves/engine-2-lp-valve-cmd">
			<default value="0"/>
			<test logic="AND" value="1">
				/controls/engines/engine[1]/fire-btn eq 0
				/engines/engine[1]/state ge 1
			</test>
		</switch>
		
		<switch name="/systems/fuel/valves/engine-2-lp-valve-power">
			<default value="0"/>
			<test logic="OR" value="1.0">
				/systems/electrical/bus/dc-ess-shed ge 25
				/systems/electrical/bus/dc-2 ge 25
			</test>
		</switch>
		
		<actuator name="/systems/fuel/valves/engine-2-lp-valve">
			<input>/systems/fuel/valves/engine-2-lp-valve-cmd</input>
			<rate_limit>/systems/fuel/valves/engine-2-lp-valve-power</rate_limit>
		</actuator>
		
		<switch name="/systems/fuel/valves/apu-lp-valve-power">
			<default value="0"/>
			<test logic="OR" value="1.0">
				/systems/electrical/bus/dc-bat ge 25 <!-- 4WF -->
				/systems/electrical/bus/dc-hot-1 ge 25 <!-- 3WF -->
			</test>
		</switch>
		
		<actuator name="/systems/fuel/valves/apu-lp-valve">
			<input>/systems/fuel/valves/apu-lp-valve-cmd</input>
			<rate_limit>/systems/fuel/valves/apu-lp-valve-power</rate_limit>
		</actuator>
		
		<!-- Pump PSI -->
		
		<pure_gain name="/systems/fuel/pumps/apu-psi-cmd">
			<input>/systems/fuel/pumps/apu-operate</input>
			<gain>25.3</gain> <!-- 9600 lb/h (guess) -->
		</pure_gain>
		
		<actuator name="/systems/fuel/pumps/apu-psi">
			<input>/systems/fuel/pumps/apu-psi-cmd</input>
			<rate_limit sense="incr">5</rate_limit>
			<rate_limit sense="decr">10</rate_limit>
		</actuator>
		
		<pure_gain name="/systems/fuel/pumps/wing-pump-left-1-psi-cmd">
			<input>/systems/fuel/pumps/wing-pump-left-1-operate</input>
			<gain>25.3</gain> <!-- 9600 lb/h (guess) -->
		</pure_gain>
		
		<actuator name="/systems/fuel/pumps/wing-pump-left-1-psi">
			<input>/systems/fuel/pumps/wing-pump-left-1-psi-cmd</input>
			<rate_limit sense="incr">5</rate_limit>
			<rate_limit sense="decr">10</rate_limit>
		</actuator>
		
		<pure_gain name="/systems/fuel/pumps/wing-pump-left-2-psi-cmd">
			<input>/systems/fuel/pumps/wing-pump-left-2-operate</input>
			<gain>25.3</gain> <!-- 9600 lb/h (guess) -->
		</pure_gain>
		
		<actuator name="/systems/fuel/pumps/wing-pump-left-2-psi">
			<input>/systems/fuel/pumps/wing-pump-left-2-psi-cmd</input>
			<rate_limit sense="incr">5</rate_limit>
			<rate_limit sense="decr">10</rate_limit>
		</actuator>
		
		<pure_gain name="/systems/fuel/pumps/center-pump-1-psi-cmd">
			<input>/systems/fuel/pumps/center-pump-1-operate</input>
			<gain>30</gain> <!-- 11000 lb/h -->
		</pure_gain>
		
		<actuator name="/systems/fuel/pumps/center-pump-1-psi">
			<input>/systems/fuel/pumps/center-pump-1-psi-cmd</input>
			<rate_limit sense="incr">5</rate_limit>
			<rate_limit sense="decr">10</rate_limit>
		</actuator>
		
		<pure_gain name="/systems/fuel/pumps/center-pump-2-psi-cmd">
			<input>/systems/fuel/pumps/center-pump-2-operate</input>
			<gain>30</gain> <!-- 11000 lb/h -->
		</pure_gain>
		
		<actuator name="/systems/fuel/pumps/center-pump-2-psi">
			<input>/systems/fuel/pumps/center-pump-2-psi-cmd</input>
			<rate_limit sense="incr">5</rate_limit>
			<rate_limit sense="decr">10</rate_limit>
		</actuator>
		
		<pure_gain name="/systems/fuel/pumps/wing-pump-right-1-psi-cmd">
			<input>/systems/fuel/pumps/wing-pump-right-1-operate</input>
			<gain>25.3</gain> <!-- 9600 lb/h (guess) -->
		</pure_gain>
		
		<actuator name="/systems/fuel/pumps/wing-pump-right-1-psi">
			<input>/systems/fuel/pumps/wing-pump-right-1-psi-cmd</input>
			<rate_limit sense="incr">5</rate_limit>
			<rate_limit sense="decr">10</rate_limit>
		</actuator>
		
		<pure_gain name="/systems/fuel/pumps/wing-pump-right-2-psi-cmd">
			<input>/systems/fuel/pumps/wing-pump-right-2-operate</input>
			<gain>25.3</gain> <!-- 9600 lb/h (guess) -->
		</pure_gain>
		
		<actuator name="/systems/fuel/pumps/wing-pump-right-2-psi">
			<input>/systems/fuel/pumps/wing-pump-right-2-psi-cmd</input>
			<rate_limit sense="incr">5</rate_limit>
			<rate_limit sense="decr">10</rate_limit>
		</actuator>
	</channel>
	
	<channel name="Flow Rates" execrate="2">
	
		<summer name="/systems/fuel/fuel-used-1">
			<input>/systems/fuel/offset-left</input>
			<input>propulsion/engine[0]/fuel-used-lbs</input>
		</summer>
		
		<summer name="/systems/fuel/fuel-used-2">
			<input>/systems/fuel/offset-right</input>
			<input>propulsion/engine[1]/fuel-used-lbs</input>
		</summer>
		
		<switch name="/systems/fuel/feed-left-inner">
			<default value="0"/>
			<test logic="OR" value="1">
				/systems/fuel/pumps/wing-pump-left-1-operate eq 1
				/systems/fuel/pumps/wing-pump-left-2-operate eq 1
			</test>
			<test logic="AND" value="0"> <!-- crossfeeding overrides gravity feed -->
				/systems/fuel/valves/crossfeed-valve eq 1
				<test logic="OR">
					/systems/fuel/pumps/wing-pump-right-1-operate eq 1
					/systems/fuel/pumps/wing-pump-right-2-operate eq 1
				</test>
			</test>
			<test logic="AND" value="1"> <!-- Suction/Gravity feed if G is not to far below 1 -->
				/accelerations/pilot-gdamped ge 0.5
			</test>
		</switch>
		
		<switch name="/systems/fuel/feed-right-inner">
			<default value="0"/>
			<test logic="OR" value="1">
				/systems/fuel/pumps/wing-pump-right-1-operate eq 1
				/systems/fuel/pumps/wing-pump-right-2-operate eq 1
			</test>
			<test logic="AND" value="0"> <!-- crossfeeding overrides gravity feed -->
				/systems/fuel/valves/crossfeed-valve eq 1
				<test logic="OR">
					/systems/fuel/pumps/wing-pump-left-1-operate eq 1
					/systems/fuel/pumps/wing-pump-left-2-operate eq 1
				</test>
			</test>
			<test logic="AND" value="1"> <!-- Suction/Gravity feed if G is not to far below 1 -->
				/accelerations/pilot-gdamped ge 0.5
			</test>
		</switch>
		
		<switch name="/systems/fuel/feed-center-1">
			<default value="0"/>
			<test logic="OR" value="1">
				/systems/fuel/pumps/center-pump-1-operate eq 1
			</test>
		</switch>
		
		<switch name="/systems/fuel/feed-center-2">
			<default value="0"/>
			<test logic="OR" value="1">
				/systems/fuel/pumps/center-pump-2-operate eq 1
			</test>
		</switch>
		
		<switch name="/systems/fuel/apu-feed-pump">
			<default value="0"/>
			<test logic="AND" value="1">
				/systems/fuel/pumps/apu-operate eq 1
				/systems/fuel/valves/apu-lp-valve eq 1
			</test>
		</switch>
		
		<!-- Refuel system -->
		<switch name="/systems/fuel/internal/left-outer-wing-tank-refuel">
			<default value="0"/>
			<test logic="AND" value="16.615">
				/systems/fuel/refuel/refuelling eq 1
				/systems/fuel/refuel/left-valve eq 1
				/systems/fuel/refuel/center-valve eq 0
			</test>
			<test logic="AND" value="11.076">
				/systems/fuel/refuel/refuelling eq 1
				/systems/fuel/refuel/left-valve eq 1
				/systems/fuel/refuel/center-valve eq 1
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/left-inner-wing-tank-refuel">
			<default value="0"/>
			<test logic="AND" value="/systems/fuel/internal/left-outer-wing-tank-refuel">
				/systems/fuel/refuel/refuelling eq 1
				propulsion/tank[0]/pct-full ge 99.9
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/center-tank-refuel">
			<default value="0"/>
			<test logic="AND" value="33.230">
				/systems/fuel/refuel/refuelling eq 1
				/systems/fuel/refuel/right-valve eq 0
				/systems/fuel/refuel/center-valve eq 1
			</test>
			<test logic="AND" value="16.615">
				/systems/fuel/refuel/refuelling eq 1
				<test logic="OR">
					<test logic="AND">
						/systems/fuel/refuel/left-valve eq 1
						/systems/fuel/refuel/right-valve eq 0
					</test>
					<test logic="AND">
						/systems/fuel/refuel/left-valve eq 0
						/systems/fuel/refuel/right-valve eq 1
					</test>
				</test>
				/systems/fuel/refuel/center-valve eq 1
			</test>
			<test logic="AND" value="11.076">
				/systems/fuel/refuel/refuelling eq 1
				/systems/fuel/refuel/left-valve eq 1
				/systems/fuel/refuel/right-valve eq 1
				/systems/fuel/refuel/center-valve eq 1
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/right-outer-wing-tank-refuel">
			<default value="0"/>
			<test logic="AND" value="16.615">
				/systems/fuel/refuel/refuelling eq 1
				/systems/fuel/refuel/right-valve eq 1
				/systems/fuel/refuel/center-valve eq 0
			</test>
			<test logic="AND" value="11.076">
				/systems/fuel/refuel/refuelling eq 1
				/systems/fuel/refuel/right-valve eq 1
				/systems/fuel/refuel/center-valve eq 1
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/right-inner-wing-tank-refuel">
			<default value="0"/>
			<test logic="AND" value="/systems/fuel/internal/right-outer-wing-tank-refuel">
				/systems/fuel/refuel/refuelling eq 1
				propulsion/tank[4]/pct-full ge 99.9
			</test>
		</switch>
		
		<!-- Feed system -->
		
		<switch name="/systems/fuel/internal/apu-source"> <!-- this only when all pumps off -->
			<default value="0"/> <!-- no fuel -->
			<test logic="AND" value="2"> <!-- center preferentially, higher psi -->
				/systems/fuel/apu-feed-pump eq 1
				/consumables/fuel/tank[2]/level-gal_us gt /consumables/fuel/tank[2]/unusable-gal_us 
			</test>
			<test logic="AND" value="1"> <!-- left -->
				/systems/fuel/apu-feed-pump eq 1
				/consumables/fuel/tank[1]/level-gal_us gt /consumables/fuel/tank[1]/unusable-gal_us 
			</test>
			<test logic="AND" value="3"> <!-- right -->
				/systems/fuel/apu-feed-pump eq 1
				/systems/fuel/valves/crossfeed-valve eq 1
				/consumables/fuel/tank[3]/level-gal_us gt /consumables/fuel/tank[3]/unusable-gal_us 
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/left-wing-tank-eng-1">
			<default value="0"/>
			<test logic="AND" value="9">
				<test logic="OR">
					/systems/fuel/quantity/center-low eq 1
					/systems/fuel/feed-center-1 eq 0
				</test>
				/systems/fuel/feed-left-inner eq 1
				/consumables/fuel/tank[1]/level-gal_us gt /consumables/fuel/tank[1]/unusable-gal_us 
				propulsion/tank[5]/contents-lbs lt 9
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/center-tank-eng-1">
			<default value="0"/>
			<test logic="AND" value="9">
				<test logic="OR">
					/systems/fuel/feed-center-1 eq 1
					<test logic="AND">
						/systems/fuel/feed-center-2 eq 1
						/systems/fuel/valves/crossfeed-valve eq 1
					</test>
				</test>
				/consumables/fuel/tank[2]/level-gal_us gt /consumables/fuel/tank[2]/unusable-gal_us 
				propulsion/tank[5]/contents-lbs lt 9
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/right-wing-tank-eng-1">
			<default value="0"/>
			<test logic="AND" value="9">
				<test logic="OR">
					/systems/fuel/quantity/center-low eq 1
					/systems/fuel/feed-center-2 eq 0
				</test>
				/systems/fuel/feed-right-inner eq 1
				/systems/fuel/valves/crossfeed-valve eq 1
				/consumables/fuel/tank[1]/level-gal_us le /consumables/fuel/tank[3]/unusable-gal_us 
				/consumables/fuel/tank[3]/level-gal_us gt /consumables/fuel/tank[3]/unusable-gal_us 
				propulsion/tank[5]/contents-lbs lt 9
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/left-wing-tank-eng-2">
			<default value="0"/>
			<test logic="AND" value="9">
				<test logic="OR">
					/systems/fuel/quantity/center-low eq 1
					/systems/fuel/feed-center-1 eq 0
				</test>
				/systems/fuel/feed-left-inner eq 1
				/systems/fuel/valves/crossfeed-valve eq 1
				/consumables/fuel/tank[1]/level-gal_us gt /consumables/fuel/tank[1]/unusable-gal_us 
				/consumables/fuel/tank[3]/level-gal_us le /consumables/fuel/tank[3]/unusable-gal_us 
				propulsion/tank[6]/contents-lbs lt 9
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/center-tank-eng-2">
			<default value="0"/>
			<test logic="AND" value="9">
				<test logic="OR">
					/systems/fuel/feed-center-2 eq 1
					<test logic="AND">
						/systems/fuel/feed-center-1 eq 1
						/systems/fuel/valves/crossfeed-valve eq 1
					</test>
				</test>
				/consumables/fuel/tank[2]/level-gal_us gt /consumables/fuel/tank[2]/unusable-gal_us 
				propulsion/tank[6]/contents-lbs lt 9
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/right-wing-tank-eng-2">
			<default value="0"/>
			<test logic="AND" value="9">
				<test logic="OR">
					/systems/fuel/quantity/center-low eq 1
					/systems/fuel/feed-center-2 eq 0
				</test>
				/systems/fuel/feed-right-inner eq 1
				/consumables/fuel/tank[3]/level-gal_us gt /consumables/fuel/tank[3]/unusable-gal_us 
				propulsion/tank[6]/contents-lbs lt 9
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/left-wing-tank-apu">
			<default value="0"/>
			<test logic="AND" value="9">
				<test logic="OR">
					/systems/fuel/quantity/center-low eq 1
					/systems/fuel/feed-center-1 eq 0
				</test>
				<test logic="OR">
					/systems/fuel/pumps/wing-pump-left-1-operate eq 1
					/systems/fuel/pumps/wing-pump-left-2-operate eq 1
					/systems/fuel/internal/apu-source eq 1
				</test>
				/consumables/fuel/tank[1]/level-gal_us gt /consumables/fuel/tank[1]/unusable-gal_us 
				propulsion/tank[7]/contents-lbs lt 9
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/center-tank-apu">
			<default value="0"/>
			<test logic="AND" value="9">
				<test logic="OR">
					/systems/fuel/feed-center-1 eq 1
					<test logic="AND">
						/systems/fuel/feed-center-2 eq 1
						/systems/fuel/valves/crossfeed-valve eq 1
					</test>
					/systems/fuel/internal/apu-source eq 2
				</test>
				/consumables/fuel/tank[2]/level-gal_us gt /consumables/fuel/tank[2]/unusable-gal_us 
				propulsion/tank[7]/contents-lbs lt 9
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/right-wing-tank-apu">
			<default value="0"/>
			<test logic="AND" value="9">
				<test logic="OR">
					/systems/fuel/quantity/center-low eq 1
					/systems/fuel/feed-center-1 eq 0
				</test>
				<test logic="OR">
					/systems/fuel/pumps/wing-pump-right-1-operate eq 1
					/systems/fuel/pumps/wing-pump-right-2-operate eq 1
					/systems/fuel/internal/apu-source eq 3
				</test>
				/systems/fuel/valves/crossfeed-valve eq 1
				/consumables/fuel/tank[3]/level-gal_us gt /consumables/fuel/tank[3]/unusable-gal_us 
				propulsion/tank[7]/contents-lbs lt 9
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/left-wing-outer-to-inner-tank">
			<default value="0"/>
			<test logic="AND" value="/systems/fuel/internal/left-outer-wing-tank-refuel">
				/systems/fuel/valves/outer-inner-transfer-valve-1 eq 1
				/accelerations/pilot-gdamped ge 0.5
				/consumables/fuel/tank[0]/level-gal_us gt /consumables/fuel/tank[0]/unusable-gal_us 
				/consumables/fuel/tank[1]/level-norm lt 0.9999
				/systems/fuel/refuel/refuelling eq 1
			</test>
			<test logic="AND" value="9">
				/systems/fuel/valves/outer-inner-transfer-valve-1 eq 1
				/accelerations/pilot-gdamped ge 0.5
				/consumables/fuel/tank[0]/level-gal_us gt /consumables/fuel/tank[0]/unusable-gal_us 
				/consumables/fuel/tank[1]/level-norm lt 0.9999
			</test>
		</switch>
		
		<switch name="/systems/fuel/internal/right-wing-outer-to-inner-tank">
			<default value="0"/>
			<test logic="AND" value="/systems/fuel/internal/right-outer-wing-tank-refuel">
				/systems/fuel/valves/outer-inner-transfer-valve-2 eq 1
				/accelerations/pilot-gdamped ge 0.5
				/consumables/fuel/tank[4]/level-gal_us gt /consumables/fuel/tank[0]/unusable-gal_us 
				/consumables/fuel/tank[3]/level-norm lt 0.9999
				/systems/fuel/refuel/refuelling eq 1
			</test>
			<test logic="AND" value="9">
				/systems/fuel/valves/outer-inner-transfer-valve-2 eq 1
				/accelerations/pilot-gdamped ge 0.5
				/consumables/fuel/tank[4]/level-gal_us gt /consumables/fuel/tank[4]/unusable-gal_us
				/consumables/fuel/tank[3]/level-norm lt 0.9999
			</test>
		</switch>
	</channel>
	
	<channel name="Final Flow Rates">
		<summer name="/systems/fuel/internal/left-outer-flow-rate">
			<input>/systems/fuel/internal/left-outer-wing-tank-refuel</input>
			<input>-/systems/fuel/internal/left-wing-outer-to-inner-tank</input>
			<output>propulsion/tank[0]/external-flow-rate-pps</output>
		</summer>
		
		<summer name="/systems/fuel/internal/left-inner-flow-rate">
			<input>/systems/fuel/internal/left-wing-outer-to-inner-tank</input>
			<input>/systems/fuel/internal/left-inner-wing-tank-refuel</input>
			<input>-/systems/fuel/internal/left-wing-tank-eng-1</input>
			<input>-/systems/fuel/internal/left-wing-tank-eng-2</input>
			<input>-/systems/fuel/internal/left-wing-tank-apu</input>
			<output>propulsion/tank[1]/external-flow-rate-pps</output>
		</summer>
		
		<summer name="/systems/fuel/internal/center-flow-rate">
			<input>/systems/fuel/internal/center-tank-refuel</input>
			<input>-/systems/fuel/internal/center-tank-eng-1</input>
			<input>-/systems/fuel/internal/center-tank-eng-2</input>
			<input>-/systems/fuel/internal/center-tank-apu</input>
			<output>propulsion/tank[2]/external-flow-rate-pps</output>
		</summer>
		
		<summer name="/systems/fuel/internal/right-inner-flow-rate">
			<input>/systems/fuel/internal/right-wing-outer-to-inner-tank</input>
			<input>/systems/fuel/internal/right-inner-wing-tank-refuel</input>
			<input>-/systems/fuel/internal/right-wing-tank-eng-1</input>
			<input>-/systems/fuel/internal/right-wing-tank-eng-2</input>
			<input>-/systems/fuel/internal/right-wing-tank-apu</input>
			<output>propulsion/tank[3]/external-flow-rate-pps</output>
		</summer>
		
		<summer name="/systems/fuel/internal/right-outer-flow-rate">
			<input>/systems/fuel/internal/right-outer-wing-tank-refuel</input>
			<input>-/systems/fuel/internal/right-wing-outer-to-inner-tank</input>
			<output>propulsion/tank[4]/external-flow-rate-pps</output>
		</summer>
		
		<summer name="/systems/fuel/internal/eng-1-flow-rate">
			<input>/systems/fuel/internal/left-wing-tank-eng-1</input>
			<input>/systems/fuel/internal/right-wing-tank-eng-1</input>
			<input>/systems/fuel/internal/center-tank-eng-1</input>
			<output>propulsion/tank[5]/external-flow-rate-pps</output>
		</summer>
		
		<summer name="/systems/fuel/internal/eng-2-flow-rate">
			<input>/systems/fuel/internal/left-wing-tank-eng-2</input>
			<input>/systems/fuel/internal/right-wing-tank-eng-2</input>
			<input>/systems/fuel/internal/center-tank-eng-2</input>
			<output>propulsion/tank[6]/external-flow-rate-pps</output>
		</summer>
		
		<summer name="/systems/fuel/internal/apu-flow-rate">
			<input>/systems/fuel/internal/left-wing-tank-apu</input>
			<input>/systems/fuel/internal/center-tank-apu</input>
			<input>/systems/fuel/internal/right-wing-tank-apu</input>
			<output>propulsion/tank[7]/external-flow-rate-pps</output>
		</summer>
	</channel>
	
	<channel name="Warnings" execrate="8">
		
		<summer name="/systems/fuel/quantity/left-wing-kg">
			<input>/consumables/fuel/tank[0]/level-kg</input>
			<input>/consumables/fuel/tank[1]/level-kg</input>
		</summer>
		
		<summer name="/systems/fuel/quantity/right-wing-kg">
			<input>/consumables/fuel/tank[3]/level-kg</input>
			<input>/consumables/fuel/tank[4]/level-kg</input>
		</summer>
		
		<switch name="/systems/fuel/mode-fault">
			<default value="0"/>
			<test logic="AND" value="1">
				<test logic="OR">
					/systems/fuel/quantity/left-wing-kg lt 5000
					/systems/fuel/quantity/right-wing-kg lt 5000
				</test>
				/consumables/fuel/tank[2]/level-kg ge 250
			</test>
		</switch>
		
	</channel>

</system>