ELEVATOR SPAR BOX - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. General.

A. Elevator Spar Box.

The elevator spar box is the primary structural component of the elevator. All other components are attached to it.

** ON A/C NOT FOR ALL

2. Description

Elevator Structure

A. Elevator Components.

The structure of the elevator has a front spar, an upper and a lower skin panel and four ribs. All components are made of laminations of Carbon Fiber Reinforced Plastic (CFRP).

B. Skin Panels.

The skin panels are attached to the front spar and to the ribs. Hi-Lok fasteners attach them to the front spar and to the ribs. Honeycomb cores make them stronger. Screws connect the aft joint of the skin panels. Rivets attach a light-alloy profile to the trailing edge to make the trailing edge stronger. The light-alloy profile is sealed.

C. Elevator Fittings.

There are six hinge fittings and two actuator fittings attached to the front spar. Six nose ribs make the leading edge stronger. Hi-Lok fasteners attach the fittings and the ribs.

D. Hoisting Points.

The elevator structure has three hoisting points. Hi-Lok fasteners attach them. Two hoisting points are installed to the front spar and to the upper skin panel. The third point is installed on rib 5 and to the upper skin panel.

E. Water Drainage.

To prevent water accumulation, two drain holes have been made in the lower skin at Rib 1.

[Rev.10 from 2021] 2026.04.01 02:05:28 UTC