Post on 13-Jan-2016
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Extinguishing Agent Application:The Good, the Bad and the Ugly
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Objectives• To discuss the proper
application and angle of extinguishing agents in a fuel spill or post crash aircraft incident.
• The passengers on the aircraft that are involved in a fire deserve the best chance for survival and it starts with us and how we apply our extinguishing agents.
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Background• Much of this presentation is an effort on our part in
the MWAA Safety and Training Division to show our personnel how to better apply extinguishing agents with the mass application appliances we possess.
• Much of this is now derived from the differences in generation of mass application appliances– traditional turrets vs. low attack nozzles.
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Background
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History• Many of us were taught in
order to effectively apply extinguishing agent on a post crash fire we had to use the roof turret on high flow to darken down the fire.
• This of course made sense because we wanted to knock down the fire quickly so passengers could escape to safety.
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History• What we are trying to fix:
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History• What we are trying to fix:
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Application Techniques• IFSTA 5th Edition refers to four different application
techniques:– Roll-on method– Bank-down method– Rainfall method– Base of the fire method
• All of these in some form or fashion have their place in ARFF world– we just need to pick the method which is appropriate to use and when.
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Priorities
• Our biggest priorities when considering how and where to apply agent are:– Evacuation path– Cooling the fuselage to allow the best chance for
passengers who have not evacuated or if an evacuation was not ordered
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Priorities• If an evacuation is underway, the ARFF Units must position
in a fashion where the best tactical advantage can be made while accomplishing both priorities– establishing or protecting the evacuation path and cooling the fuselage.
• Also taken into account is weather and wind- understanding where our turrets can reach and where the pattern will be dispersed is vital.– Occasionally, we do not have a choice if the evacuation is
underway when we arrive.
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Application• The success or failure of our mission is largely
dependent on how we apply the extinguishing agent but also our agent management.
• Having turrets quickly apply the agent for knock down/cool down gives the victims the best chance for survival– but we also want to have some agent left over in the event of re-ignition.
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Application• Initial application of agent suggests that
applying in a rain drop method allowed for the agent to fall down onto the burning product and suppress the fire.– This attack method wastes agent by allowing it to
burn up in the thermal column and has no direct benefit to the fire attack– it should only be used for protection of crews and evacuees.
– Roughly 25% of the agent is burned up in the thermal column.
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Application• The turret operator and driver (if you have two) need
to size up the situation and consider a zero degree (base of the fire method) application to darken down the fire.
• Zero degree application needs to be taken into account when:– Protecting fleeing passengers- not to knock them down
which causes more problems– Pushing the fire and/or fuel to other parts of the scene– Potential problems for our rescue personnel or dueling
streams from other ARFF apparatus.
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Application• Through our training, we have been taught that mass
application from the roof turret is the most effective way to extinguish a fuel or aircraft fire– this is still true but other advancements allow us to be flexible.
• Bumper turrets on the T-3000’s allow us to apply an almost master-stream quantity of agent to the fire with a far more precision and a higher success rate. – Also allows for increased visibility and conserves our agent
supply.
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Application• T-3000 Turrets
– Bumper Turret– Roof Turret
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Application• Low attack nozzles give us the ability to apply
a 1200/600 GPM to the fire, again with better visibility and better application rates (low attack versus high attack) and patterns.
• HRET allows for the ability to provide an elevated waterway or low angle attack through 1000/500 GPM with improved visibility and more direct attack.– Understanding the differences between the
LAN/HRET versus the traditional turrets.
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Application• Striker Turrets
– Low Attack Turret– Roof Turret
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Application• HRET Turret
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Application• Agent management is vitally important– if we waste
it we may not have it when it really counts.• Driver/Operators and Officers need to be able to
apply agent appropriately and effectively but also mindful of agent management.
• Agent should be applied in short bursts to gauge the effectiveness of the application.– This is where weather and wind come into play but can’t
always be helped.– Hydrochem application
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Application
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Research• AFRL/FAA at Tyndall AFB
– Research conducted by the AFRL and FAA shows a dramatic reduction in extinguishment time and improvement in conservation of agent by using a low attack appliance.
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Training
Structure BaysLiving Quarters
ARFF Bays
ARFF Unit Agent Delivery Course
START/FINISH
1
2
Barrel Roll1. Bumper Turret
4
Cones in a Row While Modulating and
negotiating through a debris field
1. Bumper Turret3
Elevated Target1. Bumper Turret-- Dispersed Pattern
75
Distance Target with agent management
considerations1. Appropriate Use of
Turret
6 Serpentine ForwardNo Flow of Agent
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• Questions?