Definition
A pattern of two rapid white flashes emitted in quick succession by an airport's rotating beacon, used in addition to the alternating green-and-white flashes to identify a lighted military airport. The dual peaked flashes distinguish military fields from civil land airports, which display a single white flash alternating with green.
Plain English
A beacon signal where two quick white flashes appear close together, instead of one. When you see this pattern alternating with green, the airport is a military one, not a civilian airport.
Context Anchor
Seen in discussions of airplane exterior lighting, especially anti-collision or strobe lights used to help make an aircraft more visible.
Derivation
"Dual peaked" comes from the shape of the light intensity over time: two distinct peaks of brightness occur close together, rather than one smooth flash. The phrase describes what the eye actually sees -- a quick double pulse of white light.
Why Pilots Care
Confirms the aircraft meets regulatory lighting requirements so it remains visible to other traffic and ground observers, directly supporting safe separation.
Analogy
It is like a camera flash that goes “blink-blink,” then waits a moment before doing it again.
Grounding Statement
The rapid double flash stands out against steady lights or stars, making the airplane easier to locate quickly at night.
Intuition Check
Do not read “peaked” as meaning a mountain-like shape you must see. In this lighting context, it means the light reaches full brightness twice very quickly.
Example Sentence 1
On the night cross-country, the student spotted the dual peaked white flashes alternating with green and correctly identified the field as a military airport.
Example Sentence 2
The tower controller reported the arriving airplane's dual peaked white flashes were clearly visible from three miles out.