i. The framework of formers and stringers attached to the main truss-type aircraft fuselage. It is not a load-bearing member but gives shape to the fuselage.
ii. A secondary structure built above the main fuselage or another part of the aircraft. It is used normally while testing the engine before mating the rear fuselage with the front fuselage.
iii. The above-deck structure on an aircraft.

Aviation dictionary. 2014.

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