1. The PORTABLE RUNWAY CLOSURE MARKER (RCM) must be designed to form a lighted X which contains twenty-one (21) 90 watt par 38, 10 degree weather proof outdoor standard base clear Halogen spot bulbs with one (1) bulb located in the center and five (5) bulbs located in each of the four (4) legs. All X panel bulbs, light sockets, wiring and connections must be enclosed in a weather resistant housing.

  2. The lighted X formed when opened and operating will be 20' 6" (6.248m) each continuous leg and 14' 6" (4.420m) on the peripheral.

  3. The (RCM) must collapse for transport and storage so that all parts are inside the trailer frame dimensions to prevent damage.

  4. Illumination of the (RCM) will be workable in a continuous or flashing mode. This must be controlled by a SOLID STATE FLASHER. MECHANICAL FLASHERS ARE NOT ACCEPTABLE.

5. A photo cell must be used to reduce the voltage to 75 volts for nighttime operations.

6. Flash interval time will be:

• Bright mode - Approximately 2.5 seconds on and 2.5 seconds off.

• Dim mode - Approximately 2.5 seconds on and 2.5 seconds off.

7. A radio interference filter will be installed with a operation frequency of 50 Hz.

8. The (RCM) must have at least two (2) lights (mounted at the backside of the upper portion of the top of the legs of the X) on the backside of the X to indicate power is being supplied to the (RCM) and to indicate that more than one (1) bulb has become inoperative.

9. The (RCM) must be designed so it can be used while still attached to the tow vehicle or have the means to stand alone.

10. The (RCM) must be able to withstand winds of 40 MPH (64.37 KPH) while in operational mode. THIS MUST BE DOCUMENTED.

11. The runway closure marker must be discernible from a distance of 3 to 5 miles (4.828 to 8.047 km) VFR daytime and a minimum of 6 miles (9.656 km) VFR nighttime. These distances must be determined from an aircraft using a Loran receiver. Documents substantiating these field tests by an independent third party must accompany specifications.

12. Set up time for the (RCM) must be capable of being accomplished by one person in two (2) minutes or less. This means the (RCM) can be raised and operating within this time frame.

13. The (RCM) must have the fuel capacity to run at FULL LOAD for a minimum of 120 hours without refueling.

14. The (RCM) must have the capability of being hard wired for the convenience of operating without the use of a generator for prime power.

15. All electrical components must be UL listed.