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An aircraft's tail compartment where air conditioning equipment, bleed air ducting, hydraulic reservoirs and filters, the APU, and other equipment are usually located. Named so because they're universally cramped, with parts placed in often devilish locations by engineers seemingly solely to screw over the A&P working on it. You will often find yourself working blind or being a contortionist because absolutely everything is in the way. In addition, they're hotter than hell when outside the hangar in the summer, especially when the APU was just run.
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