................................................................... |More than 100 watts | 200 ft (61 M) | 200 ft (61 M) | ................................................................... |25 to 100 watts | 50 ft (15 M) | 50 ft (15 M) | ................................................................... |Less than 25 watts *[3] | 10 ft (3 M) | 50 ft (15 M) | ................................................................... |Radiating ground approach| 300 ft (91 M) | 300 ft (91 M) | |control or pattern | | | |surveillance radar | | | ................................................................... |Open flame, heat sources,| 50 ft (15 M) | 50 ft (15 M) | |lighted smoking material,| | | |and any other potential | | | |ignition sources | | | 2.........................…...................…...................1
*[1] EIRP is Effective Isotropic Radiated Power in watts
*[2] This separation distance does not apply to airplane
installed radio transmitters. Any limits on operations for
the airplane VHF, SATCOM, HF, weather radar, etc., are listed
in the airplane operations manuals. *[3] This category includes mobile phones, pagers, two-way radios, etc. There are low power (explosion proof) radios that are approved for use in Class I division 1 hazardous locations that can be used safely in the vicinity of open, not purged, fuel cells and other areas containing fuel vapors.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 912-309
(2) Fuel in the beam of operational high-powered radar which can produce a peak power density that exceeds 5 watts per square centimeter is hazardous. Electromagnetic energy of this intensity can ignite fuel vapors and cause a fire.
S 912-504
WARNING: DURING OPEN FUEL TANK OPERATIONS, THE ENTIRE AREA AROUND THE
_______ AIRPLANE AND ANY ADJACENT AREAS THAT COULD COLLECT FUEL VAPORS ARE CLASSIFIED AS CLASS I DIVISION 1 HAZARDOUS LOCATIONS. THE HAZARDOUS LOCATION CLASSIFICATION APPLIES TO AIRPLANES BEFORE AND AFTER A FUEL TANK IS PURGED.
THE CLASS I DIVISION 1 HAZARDOUS LOCATION EXTENDS FROM THE GROUND UP TO 18 INCHES ABOVE THE GROUND. ONLY USE ELECTRICAL EQUIPMENT WHICH IS APPROVED FOR THE APPLICABLE HAZARDOUS LOCATION.
(3)
Electrical equipment which is energized or operated within 50 feet (15 meters) horizontally and 18 inches (460 millimeters) or less above the ground of an open fuel tank, must be rated explosion-proof for Class I, Division 1 hazardous locations. This includes energized plugs and receptacles. For radio and radar equipment (transmitting equipment) see Table 201 for separation distance requirements.
S 912-311
(4)
Figure 201 shows the different classification of hazardous locations around airplanes with open fuel tanks.
S 912-312
(5)
Only use approved explosion-proof flashlight that operate correctly in the fuel tanks.
NOTE: The use of explosion-proof lights in or near an open fuel
____ tank is allowed only by approved persons. The air in the fuel tank must be 10 percent or less of the lower explosive limit (LEL).
S 912-313
(6)
Only use explosion-proof flood extension lights and power cords which are approved to supply external light.
S 912-314
(7)
Do not connect or disconnect electrical equipment from energized outlets (within 100 feet [30 meters] of an open fuel tank) unless the equipment is fitted with explosion-proof plugs.
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