737-300 400 500 AMM 飞机维护手册 EXHAUST(19)

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 B.  The cascades are covered by the sleeves when the thrust reverser is stowed. During thrust reverser operation, the sleeves translate aft, exposing the cascades. The fan exhaust air is blocked by the blocker doors, and sent throught the cascades to provide reverse thrust.
 C.  The cascades are arranged to direct airflow away from the aircraft structure or engine air inlet during thrust reverser operation. The cascade installation arrangements are different for the right and left engines. When replacing cascades, it is important to ensure that the correct arrangement is being installed. Improper arrangement could cause reduced life for structural elements exposed to exhaust air.
 D.  Access to the cascades is by translating the thrust reverser sleeves.
STOWED POSITION
STOWED, THE TR PROVIDES A SMOOTH AIRFLOW FOR FAN TO PRODUCE THRUST AND AN EXTERNAL
EXTENDED POSITION
AERODYNAMIC NACELLE SHAPE
DEPLOYED, THE TR REDIRECTS THE AIRFLOW BLOCKER DOOR LINK FROM THE FAN TO PRODUCE REVERSE THRUST

Thrust Reverser Assembly
Figure 2

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
AUXILIARY SLIDER
TRACK/SLIDER FAIRING
SLIDER
SEE  A  SEE  B  FWD 
ACOUSTIC PANEL 
SLIDER 
BLOCKER DOOR (5 PLACES) 

A

FWD
B
Thrust Reverser Translating Sleeve Figure 3
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
6.  Actuators (Fig. 1)
_________
 A.  Six hydraulic actuators, spaced at intervals around the reverser case, provide the means of actuating the translating cowl to the reverse thrust position. Four actuators are identical; two are lock actuators, providing positive locking when the system is stowed. There are two common actuators and one lock actuator on each C-duct; the lock actuator occupying the upper position.
 B.  The actuators are similar in cylinder construction, the differences being in the end housing of the lock actuator, which incorporate lock mechanisms. All actuators are hydraulically and mechanically interconnected to provide synchronized operation of the translating cowl.
 C.  The actuator front mounting is provided by a gimbal ring attached to the end housing and secured to a bracket on the reverser case torque box. The gimbal ring provides flexibilty in actuator alignment. The rear connection is the actuator rod end, incorporating a spherical bearing, connected to a mounting bracket on the translating cowl aft frame.
 D.  Each actuator comprises a piston, incorporating a nut with an acme screw thread, and a piston rod accommodating an acme threaded screw shaft. A worm gear and shaft assembly transmits rotary movement of the piston rod to drive the synchronizing flexible drive shafts.
UPPER

CASCADE SUPPORT RING
Figure 4

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
E.  The end housing of the non-locking actuators houses a piston stop to limit the retract stroke of the piston. The end housing of the lock actuator is a double assembly incorporating a lock valve housing. The piston stop differs from that of the non-locking actuator in that it is internally splined to locate a locking sleeve, thus preventing rotation while allowing linear movement. Serrations on the end of the sleeve mate with similar serrations on the actuator lock in the locked position.
　
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