The system covered in this specification is intended for use on aircraft to warn or indicate one of the following through a master visual signal and an illuminated word message:

a. Warning indication. Indicates the existence of a hazardous condition requiring immediate corrective action.

b. Caution indication. Indicates to operator that an impending dangerous condition exists that requires attention but not necessarily immediate action.

c. Advisory indication. Indicates safe or normal configuration, condition of performance, operation of essential equipment, or attracts attention and imparts information for routine action purposes.