Safety
In Fight Against Contamination, NATA Issues DEF Decals
The decals are intended to clearly label DEF storage containers to reduce the possibility of mistaking DEF with other liquids.

The National Air Transportation Association (NATA) is distributing free diesel exhaust fluid (DEF) decals as the association continues to highlight the need for proper training and handling of the substance that has been involved in jet-A contamination incidents and led to in-flight emergencies. The decals are intended to clearly label DEF storage containers to reduce the possibility of mistaking DEF for other liquids such as fuel-system icing inhibitors.