cooling pings from the sheet metal contracting

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Hi. It is a line from the TV show named 'The Strain'.

A: Have you done heat readings?
B: Surface of the plane's too cold. Blocks it all like a screen. We got Delsar Mics attached to the surface of the plane, picked up mostly silence.
A: Mostly?
B: Well, cooling pings from the sheet metal contracting.

I can't understand the line underlined.
Can you explain what the meaning is?

Thank you.
  • Florentia52

    Modwoman in the attic
    English - United States
    When metal cools, it contracts (shrinks slightly) and makes pinging noises. The microphones are picking up mostly silence, but also some pinging noises caused by the contracting of the sheet metal as it cools.
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