S 912-228
WARNING:_______FOLLOW THE SUBSEQUENT RADIO AND RADAR LIMITS. FAILURE TO FOLLOW THE SUBSEQUENT RADIO AND RADAR LIMITS CAN CAUSE A FIRE OR EXPLOSION. A FIRE OR EXPLOSION CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND CAN CAUSE DAMAGE TO EQUIPMENT.
(1) No radio or radar equipment should operate nearer to an open fuel tank than the distances specified in Table 201.
~................................................................. | TABLE 201 | ................................................................... | | SEPARATION DISTANCE (FEET) | | ......................................... | | MAINTENANCE | MAINTENANCE | | | WITH OPEN | WITH OPEN | | POWER (EIRP *[1]) | FUEL TANKS | FUEL TANKS | | OF EQUIPMENT | | | | TRANSMITTING | PURGED | NOT PURGED | | RADAR OR RADIO *[2] | |(or during purging)| ................................................................... |More than 100 watts | 200 | 200 | ................................................................... |25 to 100 watts | 50 | 50 | ................................................................... |Less than 25 watts *[3] | 10 | 50 | ................................................................... |Radiating ground approach| 300 | 300 | |control or pattern | | | |surveillance radar | | | ................................................................... |Open flame, heat sources,| 50 | 50 | |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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MAINTENANCE MANUAL
S 912-229
(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 912-349
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.
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