- a hydraulic valve The minimum hydraulic pressure for which the latch releases is 45 to 65 bars (640 to 925 psi).
(2) Operation
(Ref. Fig. 009, 010)
(a) Door unlocking sequence (deployment) (Ref. Fig. 011) Under high pressure action, the latch actuator actuates the lever. At the end of the latch actuator stroke, the piston ports hydraulic fluid through a hole which enables the following latch actuator high pressure supply. The lever is then in a position which does not interfere with the hook rotative movement. As soon as the door leaves the stowed position, because of the door actuator force and aerodynamic loads, the hook is held by the two levers in the unlocked position and releases the olive shaped button.
(b) Door locking sequence (stowage) (Ref. Fig. 012) At the end of deployment the latch hydraulic actuator is connected to return. The latch actuator ports fluid out under spring action. Fluid output of the next latch is made possible by a hole in the chamber of the valve.
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Door Latch
Figure 008
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Door Latch
Figure 009
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Door Latch - Hydraulic Schematic
Figure 010
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Thrust Reverser Door Latch - Deploy Sequences
Figure 011
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Thrust Reverser Door Latch - Stow an Lock Sequences
Figure 012
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E E The door hook olive shaped button makes contact with the hook which makes it rotate untill the lever moved by spring action achieves its locked position. As long as the door actuators are under pressure the door remains on its latch inner stop (door over stowing of 2 mm maxi (0.08 in. maxi). As soon as the door actuators are connected to return, the doors move to the flush position under seal action and aerodynamic loads. The olive-shaped button is then displaced to the upper part of the latch hook which has taken up the play. There is a manual unlocking pin which permits the unlocking sequence without hydraulic pressure.
(3) Removal/installation The latch is secured by four bolts on the thrust reverser forward frame.
(4) Adjustment The adjustment of the flush position of the door is made by sliding the latch fitting.
D. Hydraulic Actuator - Blocker Door
(Ref. Fig. 013)
(1) General There are four hydraulic actuators, mounted on the forward frame by a ball joint assembly support. They constitute a differential double-acting unit. They are supplied by the HCU. These hydraulic actuators have four different functions :
- to deploy doors
- to stow doors
- to ensure a secondary lock in stowed position by a system of claws
- to ensure that doors rotation speed slows down at the end of the
deploy phase. The actuators comprise a manual unlocking system for maintenance.
(2) Description/operation
(Ref. Fig. 014)
(a) Deploy sequence The actuator is initially in position of direct flow, locked. On the deploy command the hydraulic pressure is supplied to the rod side of the actuator (chamber B). The hoses are located on the head of the actuator, then the pressure is supplied (to chamber B) by the means of a central hose and an interior chamber which communicate with the chamber B through port (T).
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Door Actuator System
Figure 013
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Blocker Door Actuator Deploying
Figure 014
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E E After the unlocked sequence of the door latches, the head actuator chamber (A) is supplied by the HCU. The pressures in chambers (A) and (B) are equal but the difference of surfaces between the piston, the head side and the rod side enables the movement of the piston and thus opening of the door. The actuator limits the speed of the deployment. Load required to deploy is about 684 daN (15.38 lbf) with a pressure of 206 bar (2987 psi). The actuators have a stroke of 260 mm (10.24 in.).
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