Unit 5 - NWCG

Unit 5 - NWCG

Unit 5 Bench Testing, Maintenance, and Troubleshooting Unit Objectives Identify three primary steps in bench testing a helitorch. Identify six considerations in maintaining helitorch and mixing systems.

Given a typical problem encountered during helitorch operations; troubleshoot potential solutions. Helitorch Bench Testing Prior to helitorch operations, a bench test will be conducted. Helitorch Bench Testing Helitorch should be empty.

40-B:C fire extinguisher available. Ensure switches are off and propane bottle is installed. Connect 24 volt power source to helitorch with the 9 pin adapter. With the pump switch off, turn on the igniter switch, check for spark and if applicable, propane ignition. With the ignition switch off, turn on the pump switch, check pump to ensure it is moving gel and/or air.

Do not run pump dry for more than a few seconds. Ensure polarity is correct. Turn switches off and unhook power source. Remove 9 pin adapter. Check suspension cables, wire ties, bolts, nuts, connectors, and drum tie down straps for tightness and serviceability. Helitorch Maintenance Disassemble torch tip and clean. Check electrical cable. Service & repair dry break coupler. Check motor brushes periodically (Simplex). Keep components clean & free of moisture. Reference helitorch inspection checklist (IAIG APP B). Flush system with diesel or Jet A for storage. Do not store helitorch with gel remaining in plumbing.

Remove propane bottle and install empty cylinder. Store in a sheltered, clean, dry area. Apply service tag after maintenance performed with name, date and any needed repairs. Batch Mixing System Simplex batch mixer FireCon batch mixer General Mixing System Maintenance Batch mixers that meet MC306 or DOT 406 design specs must comply with DOT regulations.

Annual visual inspection by DOT certified inspector. Hydrostatic pressure test every 5 years by a DOT certified inspector. Maintain trailer brakes, wheel bearings, electrical system, engine oil, air filter, spark arrestor, and general integrity of the unit.

Batch Mixer Maintenance Keep 2 male plugs in place when not in use. Store hoses out of sunlight. Use fuel stabilizer in gasoline tanks of pump when stored for more than 2 weeks. Where 2 dry break attaches to tank, coat with

gasoline pipe dope. Before storing, wash inside of tank and hoses with clean diesel. Leave 3-5 gallons of diesel in tank to keep parts lubricated while storing. Disarm emergency release controls on DOT 406 or 306 tanks before storing or transporting.

Turn off all valves prior to mobilization or storing the batch mixer. Mix Transfer Maintenanc e Store hoses out of sunlight. Keep 2 male plugs in place when not using.

Use fuel stabilizer in gasoline tanks of transfer pump when stored for more than 2 weeks. Where sight glasses, 2 camlock , dry break parts attach to barrel/ drum coat threads with gasoline type pipe dope. Before storing flush barrel/drums with clean diesel or clean barrel

by removing drum lid and wiping barrel clean. Leave a small amount of clean diesel in hoses and barrels before storing. Drum Maintenace Keep drum purged of gelled fuel.

Paint as needed to prevent rust. Store in clean, dry environment. Keep dry break valve clean of dirt & debris. Keep Clay & Bailey,

site glasses and camlocks free of gel residue. Associated Hardware Troubleshooting - If gel makes contact with venting marble un-equalized pressure may occur, causing the motor to drag and pop circuit breaker of helicopter. Associated Hardware Troubleshooting -

2 female cam-lock with Clay & Bailey inserted for more clearance Vapor Hose Maintenance Store hoses in dry location away from sunlight. Keep 2 cam-lock on hose while being stored. Perform continuity test.

Replace brittle/cracked hoses. Clean all vapor recovery hoses of any gel residue. Mixing Agents Keep all gelling agents in a cool non-freezable dry storage area. Ensure MSDS requirements are met.

Helitorch Troubleshooting Problem: circuit breakers on helicopter stay tripped open Solution may include the following: Check polarity of plug between helicopter and torch

Check for electrical shorts in wiring Check motor for short Check Clay & Bailey Helitorch Troubleshooting TipBefore testing helitorch with the helicopter, disconnect pear-link from the aircraft cargo hook. Failure

to follow this procedure can result in damage to the helicopter wiring if polarity is incorrect. Problem: No spark from igniter Solution may include the following: Check igniter switch

Check electrical connection from helicopter Check vibrator (Simplex & Spec 2000) Check coil & coil wiring (Simplex & Spec 2000) Check wire connection on igniter rod (Spec 2000)

Problem: Propane does not light (Simplex, Isoliar, and Barrel torches) Solution may include the following:

Check propane quantity and pressure gauge Check that solenoid valve is opening Check for plugged propane torch orifice Replace propane bottle Ensure propane torch tip slit is in line with the ignition rod Problem: No gel being pumped

Solution may be one of the following: Check pump switch Make sure valves are open Check pump for obstructions Check hose for obstructions Check thickness of gelCheck motor and drive belt (Simplex). Pump pulley turning in correct direction (Simplex).

Helicopter or 9 pin plug on the helitorch is wired backwards, polarity is wrong (Check the helitorch first). No Ignition? Unit Objectives Identify three primary steps in bench testing a helitorch. Identify six considerations in maintaining helitorch and mixing systems.

Given a typical problem encountered during helitorch operations, troubleshoot potential solutions.

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