Issue
Hazard description
TRUCKS EQUIPPED WITH PRE-121 KELSEY HAYES ANTI-LOCK BRAKE CONTROL SYSTEM. BRAKE CONTROL COMPUTER MODULE SYSTEMS MANUFACTURED PRIOR TO MARCH 1, 1975 MAY MALFUNCTION WHEN THE MODULES ARE SUBJECTED TO RADIO REQUENCY INTERFERENCE ABOVE 20 MEGAHERTZ AT POWER LEVELS IN IXCESS OF 30 WATTS FROM ON BOARD TWO-WAY RADIOS DURING SIMULTANEOUS BRAKING AND RADIO TRANSMISSION.
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