Definition
An ATC instruction directing the pilot to begin a climb without delay, taking precedence over normal climb planning or pilot discretion. The word 'immediately' is used by controllers when prompt compliance is required to avoid a hazard, typically terrain conflict, traffic conflict, or airspace separation.
Plain English
Start climbing right now — don't wait, don't finish what you were doing first. ATC needs altitude between you and something else fast.
Context Anchor
Seen in instrument procedure instructions, missed approach guidance, and training scenarios where prompt upward flight is needed for safety.
Derivation
Immediately' comes from the Latin 'immediatus,' meaning 'without anything in between.' In ATC phraseology it carries that exact force — no intermediate steps, no delay, no acknowledgment-then-act. The climb begins as the instruction is received.
Why Pilots Care
Failure to comply can result in terrain conflict or loss of separation during time-critical phases of flight.
Intuition Check
Do not read “immediately” as “pull back sharply.” It means begin the climb without delay, while still flying the aircraft smoothly and under control.
Example Sentence 1
Tower called, 'November Three Four Alpha, climb immediately, maintain four thousand,' and the pilot pitched up and added power without hesitation.
Example Sentence 2
ATC told the aircraft to climb immediately to 4000 feet to avoid traffic below.