G10922
Elevator Control System Component Location 500
27-31-0 Figure 1 Aug 15/68
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
H. A flight controls hydraulic low pressure warning system provides an indication of elevator, aileron and rudder low pressure. Common warning lights are displayed on the forward overhead control panel and on the lightshield. A feel pressure differential amber light is provided on the forward overhead control panel. The light will illuminate when an undesirable pressure difference exists between the feel computer output pressures. A stall warning shaker is fitted to the captain's control column.
I. Additional reliability is provided by duplication of certain mechanical and hydraulic components within the elevator and tab control system.
2. Elevator
A. Each elevator is an aluminum alloy frame structure consisting of leading and trailing edge spars, ribs, and a fiberglass skin or of graphite/epoxy construction with upper and lower skins of graphite/epoxy tape and Nomex honeycomb core. A rectangular cutout is provided towards the inboard portion of the elevator trailing edge for installation of the tab. A balance horn is incorporated forward of the hinge line at the outboard tip of each elevator for the purpose of installing balance weights.
B. Each elevator is attached to the stabilizer by means of six hinge fittings, the second hinge from inboard serving as a thrust hinge. The leading edge of each elevator extends forward between the hinge fittings and connects to the three balance panels. The two elevators are physically linked together through the output torque tube.
C. The elevator and elevator tab are independently balanced. The elevator is statically balanced as a component. The elevator tab is balanced into the elevator by adding or removing tab adjust weights on the elevator nose. The number of weights required is a function of the weight of the elevator tab.
D. Seals are situated along each elevator inboard rib, between the elevator and tail cone. The seals are a dacron and silicone rubber composition, and are used to minimize airflow between the upper and lower surfaces of the elevator.
3. Elevator Tabs
A. The elevator tabs are of fiberglass honeycomb or of graphite/epoxy construction (Fig. 1). Each tab has an aluminum alloy (fiberglass on early tabs) leading edge spar which provides the mounting for the four hinge fittings and the tab mast. No balancing is required for the tabs.
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Jun 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-31-0 Page 3
B. During manual reversion mode the tab lock actuators are depressurized and the tabs travel in a balance direction to assist elevator movement. During power mode the actuators extend to change the geometry of the tab lock linkages. This places the tabs in a faired position relative to the elevator for any elevator position. (See figure 6.)
C. The elevator tab may be replaced without rebalancing the elevator. Each tab is furnished with adjust weights that bolt to the elevator nose. The required number of tab adjust weights is stamped on a data plate attached to each elevator tab. The number of weights required is a function of the weight of the elevator tab.
4. Elevator Balance Panels and Seals
A. The elevator balance panels (figure 2) assist elevator movement by utilizing aerodynamic forces created when the elevators are displaced from neutral. The three balance panels are attached by means of hinges to the leading edge of each elevator. An idler hinge panel interconnects the forward edge of each balance panel to structure within the stabilizer and provides the necessary articulation of the panel. The panels are fabricated from clad aluminum sheet. Each balance panel is located in a separate bay between the ribs within the stabilizer.
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