How do you define Warning, Caution, Advisory, Memo Message

3 type of Messages :-

i) Alert (further divide to 3 level of message, Warning, Caution & Advisory)
ii) Memo
iii) Status




Warning (Level A Message)

a) indicate an operational/airplane system condition which requires immediate corrective/compensatory action

b) red in colour

c) Master Warning Light illuminate

d) Aural Warning

e) cannot be cancel

f) appear from top to bottom



Caution (Level B Message)

a) indicate an operational/airplane system condition which requires immediate crew awareness and some prompt compensatory action

b) amber in colour

c) Master Caution Light illuminate

d) Aural Warning

e) can be cancel

f) appear from top to bottom


Advisory (Level C Message)
>Advisory (Level C Message)
">" meaning you cannot find required action in pilot Quick Reference Handbook

a) indicate an operational or airplane system condition that requires crew awareness for possible future compensatory action

b) indented, amber in colour

c) can be cancel

d) appear from bottom to top



Memo

a) crew reminder of the current state of certain selected normal condition

b) white in colour

c) most recent message appear on top first (displayed on available line, below last advisory message)

d) cannot be cancel



Status (Level S message)

a) to determine the dispatchability of the aircraft

b) white in colour

c) display at Aux EICAS

d) can be cancel (on CMC Present Leg Fault, not EICAS Synoptic Page CANC button)


from Human Resources, courtesy of Alvin
(info fully extracted from ATA 31 and MEL)