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It's the infrared sensor for the Enhanced Flight Vision System (EFVS). From FedEx Newsroom June 23, 2008: FedEx Express is the first major commercial carrier in the airline industry to receive a Supplemental Type Certificate from the FAA for the advanced system, authorizing its installation in the company’s fleet of Boeing MD-10 freighters. The company’s ...


That is the port-side ventral airbrake, as can be seen in this diagram:


The 'lump' holds a ground surveillance (mapping) radar. IL-76 has two radars: the usual meteo radar in the nose and the ground surveillance radar (primarily for navigation). In addition to that, like all contemporary Soviet long(er)-range transports (esp. military ones), it has a dedicated navigator position with the glassed 'verandah' for better view of the ...


The lump acts primarily as an extension to the cockpit, as it is known that soviet military planes require more pilots to operate them. The lump is used as a bay to get the navigator a view of the ground. See (related): Quora: Why-does-the-Ilyshin-Il-76-have-glass-under-the-nose Despite being equipped with all possible navigational equipment, there was ...


This appears to be an Outside Air Temperature probe.


NOTE: Revised in response to poster comment: The engine is a Lycoming O-320 D2G, part of the series that replaced the disastrous H2AD engine which that '77 172 originally came with, in 1981 (the H2AD was '77 to '80). The H2AD engines (I have to think some joker at Lycoming put the AD designation in as a gag — it had a number of ADs against it), among other ...

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