. SERVICE LETTER MOS 51 737-SL-02-024 REV. A LITHIUM BATTERY FIRE FIGHTING RECOMMENDATIONS. SERVICE LETTER 28-APR-20I4 MOS 51 737-SL-03-004 AVIOD USE OF DRY CHEMICAL FIRE EXTINGUISHERS ON AIRPLANES. SERVICE LETTER MOS 16-AUG-2005 St 737-SL-03-004 REV. A AVOID USE OF DRY CHEMICAL FIRE EXTIN