LANDING GEAR SUPPORT BEAMS - DESCRIPTION AND OPERATION
1. General
A. The landing gear support beams are two-piece I-section forgings bonded and bolted together, and connected at their outboard ends to the left and right wing rear spars and at their inboard ends to the left and right sides of the fuselage. (See figure 1.)
2. Landing Gear Support Beam Structure
A. Each beam is connected to the side of the fuselage by a short swinging link whose upper end is hinged from fuselage fittings at body stations 695 and 706, and whose lower end is hinged to the beam slightly outboard of its inboard end. Each landing gear support beam is connected at its outboard end to the aft face of the wing rear spar, by a single pin in a heavy forged fitting. These connections at each end of the beams allow them to transmit landing loads into the wing and fuselage. The forward end of the inboard flap inboard track is attached to a fitting on the inboard end of the beam. Several ribs supporting the inboard spoiler are attached to the aft face of the beam. Slightly inboard of its midpoint the beam incorporates a bearing for the aft end of the main landing gear trunnion.
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LANDING GEAR SUPPORT BEAMS - REMOVAL/INSTALLATION
1. General
A. The landing gear support beams are connected to the wing rear spars at the outboard ends and to the fuselage by means of swing links at the inboard ends. To remove the support beam, the complete landing gear, the swing link, the flap transmission, spoiler actuator and supports, flap drive and miscellaneous electrical and hydraulic clamps must be removed.
2. Equipment and Materials
A. Deleted
B. Primer - BMS 10-11, Type 1 (Ref 20-30-41)
C. Grease - MIL-G-23827 (Ref 20-30-21)
D. Corrosion Preventive Compound - Petrolatum, Hot Application, MIL-C-11796, Class B (Ref 20-30-21)
3. Prepare for Landing Gear Support Beam Removal
A. Defuel airplane wing tanks (Ref Chapter 28, Fuel).
B. Extend flaps to gain access to aft side of landing gear support beam.
C. Remove main landing gear on the side where beam removal is to be accomplished (Ref Chapter 32, Landing Gear ).
D. Remove main gear wing door (Ref Chapter 32, Landing Gear).
E. Remove inboard flap track fairing (Ref Chapter 27, Flaps).
F. Open ground spoilers for further access.
4. Remove Landing Gear Support Beam
A. Remove eyebolt connecting stabilizer beam to stabilizer beam attach fitting on support beam. Move stabilizer beam down and out of way (Detail A, Fig. 401).
B. Remove stabilizer beam attach fitting from support beam by unbolting. Note position of shims for reinstallation.
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Landing Gear Support Beam Installation 501
57-15-0 Figure 401 (Sheet 1) Feb 15/73
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501 Landing Gear Support Beam Installation
Feb 15/73 Figure 401 (Sheet 2) 57-15-0
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C. Remove bolts which secure walking beam hanger fitting assembly to support beam and remove fitting. Note location and thickness of shims for reinstallation on beam. (See detail B, sheet 2, figure 401.)
D. Disconnect spoiler braces and remove lower wing skin section which is attached to beam aft of landing gear wheel well.
E. Disconnect and remove hydraulic tubing as necessary for access to swing link.
F. Disconnect both ground spoiler actuators and bracing, one from aft side of support beam and other from rear spar for clearance. Refer to Chapter 27, Speed Brake Control System.
G. Disconnect hydraulic tubing and electrical wiring attached to support beam as necessary. Note location for reassembly.
H. Disconnect flap transmission. Refer to Chapter 27, Flaps.
I. Disconnect flap angle gearbox from aft side of support beam, and remove the inboard section of flap torque tube. Refer to Chapter 27, Flaps.
J. Support landing gear support beam.
K. Unbolt and remove swing link sections between fuselage structure and inboard end of support beam. Record location and definition of shims and washers used on assembly of swing link. Save all shims and washers. (See figure 402.)
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