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Aerial Ignition Home > Plastic Sphere Dispenser > Equipment > PREMO MK III Operational Manual > Operational Manual

Operational Manual

A metal container (about two gallon size) is necessary to catch and remove primed spheres from the vicinity of the aircraft. Do not conduct this test near refueling area or where other combustibles can be ignited.

Deposit several spheres into the dispenser hopper and place the metal container under the dispenser exit chute.

To start the Dispenser:

  1. Lift feed control handles. (refer to page 16, A.)

  2. Turn on hopper-feed switch. Ensure free movement of spheres in feeder chutes an and that chutes are filled.

  3. Pull out on the manual assist wheel and rotate until one sphere drops into the slipper block. This procedure is a feel, as well as a visual process. The feed chute assembly has slots so that the operator can see the spheres as they process down into the slipper blocks. As the operator turns the assist wheel, a pressure will be felt. The pressure is caused by the sphere riding against the injector needle. Any further rotation will inject the sphere and cause a possible fire in the dispenser. The assist wheel may not always snap back because the drive slot and the assist wheel may not be aligned. Allow it to remain out. When the electric drive is turned on they will align themselves and start processing spheres.

  4. Turn on drive (slow speed), ensure free movement of sipper blocks and a steady progression of spheres down the feed chute.

  5. Turn on glycol pump (spheres will now be primed), run a few spheres through the dispenser. Then stop the dispenser as follows:

    1. Close feed chute by lowering control handles.

    2. Turn off hopper feed.

    3. After all spheres have cleared the dispenser, turn off the glycol pump and main drive.

    4. Remove the metal container away from the aircraft.

    5. Timing of ignition should begin when the spheres clear the dispenser exit chute.

    6. All spheres should ignite in about 20 seconds (Grade "C" spheres and anti-freeze). Any apparent discrepancy must be corrected by following bench test procedure to adjust anti-freeze amount. (Ex. 13)

    7. Check the system for leaks.

    8. Test the on-board fire extinguisher by pushing the red water button on the control panel.

    9. Check intercom communication and aircraft to ground communications.

    10. To correct any malfunction, see trouble shooting section.

Note: Problems are minimized if starting instructions are strictly followed.

Caution: The preflight test must have ensured the following:

  1. installation as instructed with restraints in place

  2. mechanical operation satisfactory

  3. extinguishing system filled and operational

  4. additional one gallon of water available

  5. glycol reservoir filled and tightly capped

  6. sharp knife readily available

  7. approximate 20 second ignition delay achieved

  8. in aircraft and aircraft to ground communications operable

  9. pilot and operator wear Nomex or other fire resistant clothing, flight helmets and goggles

  10. operator must be well trained and qualified

  11. pilot has been briefed and agrees that all is in order

2-c Bench Test Procedure

Operator should wear gloves and goggles with breathing mask during this test. Review applicable portion of operation check list prior to beginning bench test.

Mount the dispenser securely on a suitable table or bench approximately 30 inches high.

Fill dispenser with ethylene glycol and water.

Connect the power cord to proper power supply—one 24 volt battery or tow 12 volt batteries connected in series. Special receptacle required.

Adjust injector control valves by loosening locknuts and rotating valve screw. (New dispensers are pre-set) Test should be conducted prior to adjustment of needles (Ex. 13)

Photo of an injector control valve being adjusted.


Photo of a hand holding a ping-pong ball.



Place metal bucket under exit chute (about five gallon size). Ignition will occur during this test.

  1. Ensure that glycol tank is filled and its cap is securely fastened. Refer to the section on priming the pump.

  2. From within hopper, drop several EMPTY spheres into desired feed chute.

  3. Lift feed control handles.

  4. Pull out manual assist and rotate until one sphere drops into slipper block.

  5. Turn on drive and glycol pump allowing a few EMPTY spheres to be filled with glycol. Note that if the glycol system has air trapped within it, the first several spheres may not produce an accurate reading until the air is fully bled from the glycol system. Refer to the section on bleeding the air.

  6. Catch spheres as they exit the Dispenser and take reading. Spheres should be approximately 1/8 full with anti-freeze for proper ignition. (Ex. 14)

  7. Turn off drive and glycol pump. Repeat procedure if required after adjusting valve. Calibrate remaining chutes.

After adjustments have been made, repeat above procedure using spheres charged with Potassium Permanganate and allow them to fall into the metal container that has been placed under the exit chute. A stop watch should be used to time the delay of the spheres from injection to ignition. Ignition delay should be approximately 20 seconds. Increase amount of glycol by turning valve to left (counter clock-wise) until desired delay is obtained. Continue with adjustment for all (4) chutes. About ¾ cc of anti-freeze will give approximately 20 seconds delay with grade "C" spheres.

2-d Hangfire Test Procedure

  1. Ensure that the emergency water tank is filled and its cap is securely fastened. Refer to the section on priming the pump. Run a few spheres charged with Potassium Permanganate through the Dispenser. Turn off main drive, glycol pump and hopper feed while injected spheres are still within the slipper blocks. Do not remove hopper. A fire will (should) occur in the slipper blocks.

  2. Activate the built-in emergency water supply. A one gallon canteen of water must be available for this test should the emergency water supply fail to extinguish the fire.

  3. Rotate manual assist wheel to clear machine. If machine will not clear, remove hopper and remove particles of unburned plastic from slipper blocks with screw driver.

  4. Turn on dispenser and observe to ensure machine is clean and working properly. Additional cleaning may be necessary.

  5. Replace hopper and make short re-test.

NOTE: Intentional fouling of machine should be accomplished with sphere in slipper block to test emergency fire extinguisher and operators ability to remove broken spheres. Cleaning and storage of dispenser should follow bench test.

2-e Cleaning and Storage

Clean with water, CRC 656 or 666 and degreaser or equivalent. Lubricate moving parts with "Triflon" or "Never-Seize" or equivalent. WD-40 is not recommended. Dry machine before storage in shipping crate. Store with glycol tank full of anti-freeze. Store with water tank empty.

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