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In the next picture what are the items circled in red?

747 undercarriage Photographed by Adrian Pingstone in August 2002 and released to the public domain.

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The forward ones are a ram air inlet (NACA duct) for the Environmental conditioning System (ECS) and what looks like an antenna. The aft one is an exit louver for the ECS.

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  • $\begingroup$ @Federico You're right. I didn't see that :). Looks like an antenna. $\endgroup$ – aeroalias Mar 30 '16 at 9:12
  • $\begingroup$ I don't think it's an antenna, I think it's a drain, similar to here. $\endgroup$ – fooot Mar 30 '16 at 15:21
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The forward inlets are air inlets for the air conditioning and pressurisation. I am not sure of the after ringed area.

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