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There are five compression wear plates mounted on fittings on the left and right lower bifurcation of the inner walls. The lower bifurcation compression wear plates are adjustable with shims.
The left latch beam has six tension latches for the thrust reverser. The right latch beam has five latch hook bolts. The three latch access doors are attached to the left latch beam. The latch beam aft of the lower bifurcation fire seals for the drain mast is covered with thermal insulation blankets.
The latch wearplates and shims are mounted to the side of the tension latches and are adjusted when the strut or the thrust reverser is replaced.
The tracks for the translating sleeve are machined into the hinge beam and the latch beam. Track liners are installed in the tracks. There is a main track and an auxiliary track on each beam. The main track engages the main track sliders on the inner wall of the translating sleeve and carries the weight of the translating sleeve. The auxiliary track engages the auxiliary track sliders on the outer wall of the translating sleeve.
On the lower latch beam, around the latch housings, there are six shear pins on the left thrust reverser and six shear pin bushings on the right thrust reverser. The shear pins fit into the bushings when the thrust reverser is closed and latched. The purpose of the shear pins and bushings is to align the bottom of the thrust reversers together. If a shear pin or bushing is missing, there would be an increase in loads and wear on the remaining shear pins and bushings. The forward shear pin and bushing and the aft shear pin and bushing cannot be missing. Any missing shear pin or bushings must be replaced.
Bulb-type fire seals are mounted in metal retainer tracks on the length of the upper bifurcation and aft cowl, the inner wall of the fan duct cowl to the v-blade seal, and the lower bifurcation to the latch beam. When the thrust reverser is closed and latched, the bulb type fire seals are compressed against the metal seal depressors on the strut, the engine upper fancase and the structure around the lower engine drain mast. These seals help to contain an under cowl fire. Some of the fire seals act also act as aerodynamic seals which close off air gaps that can cause an operational economic penalty.
The torque box outer v-blade fits into the v-groove in the engine fan case. There are v-blade seals aft of the outer v-blade. The inner wall v-blade fits into the v-groove in the engine core. There are v-blade seals aft of the inner wall v-blade.
EFFECTIVITY BEJ ALL 78-31-00
Page 12
D633W101-BEJ May 05/2003
THRUST REVERSER SYSTEM -COMPONENTS
There are aerodynamic seals which close off air gaps that can cause an operational economic penalty. There are miscellaneous seals and bumpers that provide a cushion for the thrust reverser halves when they come together when the thrust reverser is closed and latched.
The thermal insulation blankets are installed on brackets and click-bond studs that are installed on the inner surface of the inner wall. Thermal insulation blankets are mounted on the inside surface of the fan duct cowl and upper and lower bifurcation. These blankets are a thermal insulation and fire barrier which is necessary to keep the thrust reverser structurally serviceable and can decrease the damage and repair costs from a duct burst or fire. The thermal insulation prevents heat damage to the composite inner wall of the fan duct cowl from fire and heat radiated from the engine during engine operation.
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