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 ALL  ú ú 01 Page 2 ú Jul 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 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 come on when an undesirable pressure difference exists between the feel computer output pressures. A stall warning shaker is fitted to the control columns.
 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 a honeycomb structure consisting of leading and trailing edge spars, ribs, and a graphite/epoxy skin. A rectangular cutout is provided toward 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 first and 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 compositon and are used to minimize airflow between the upper and lower surfaces of the elevator.
 3.  Elevator Tabs (Fig. 1)_____________
 A.  The elevator tabs are of honeycomb construction with a graphite/epoxy skin. No balancing is required for the tab.
 B.  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.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 4.  Elevator Balance Panels and Seals (Fig. 2)
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 A.  The elevator balance panels 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. Each balance panel is located in a separate bay between the ribs within the stabilizer.
 B.  During flight, movement of the elevator in either direction from faired, causes a pressure differential between upper and lower balance bays. This pressure acts upon the balance panels to assist elevator movement.
 C.  Access to the balance panels is through the balance bay access panels on the underside of the stabilizer. Balance weights are attached to the aft surface of each balance panel.
 D.  Seals are situated around the periphery of the balance panels and idler hinge panels and across the lower surfaces of the hinges. The seals are a dacron and silicone rubber composition and are used to minimize air flow from one side of the balance panel bay to the other.

ELEVATOR
PANEL
SEAL
Elevator Balance Panel Schematic Figure 2
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