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a warm-oil bleed restrictor, which is connected to the high-pressure system of the aircraft. This gives a constant calibrated flow of fluid through the RAT pump when the RAT is not in use.
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a solenoid-operated spool valve which connects the high-pressure system of the aircraft to the low-pressure system of the RAT for ground test. At the same time it connects the high-pressure system of the RAT to the low-pressure system of the aircraft.
-
a pressure switch which is used only during the ground test of the RAT with the ground test kit. The switch controls the correct change from ground test mode to flight mode.
**ON A/C ALL
G. RAT Control Panel
**ON A/C 001-049, 051-061, 101-105, 201-203,
(Ref. Fig. 011)
R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
(Ref. Fig. 011A)
R 1EFF : ALL 1 29-22-00Page 30 1 1 Config-1 Aug 01/05 1 1 1CES 1
RAT Ground Check Module
Figure 010
R 1EFF : 001-049, 051-061, 101-105, 201-203, 1 29-22-00Page 31 1 1 Config-1 May 01/05 1 1 1CES 1
RAT Control Panel
Figure 011
R 1EFF : 001-049, 051-061, 101-105, 201-203, 1 29-22-00Page 32 1 1 Config-1 Aug 01/05 1 1 1CES 1
RAT Control Panel
Figure 011A
R 1EFF : 062-099, 106-149, 151-199, 204-299, 1 29-22-00Page 33 1301-399, 401-499, 1Config-1 Aug 01/05 1 1 1CES 1
**ON A/C 001-049, 051-061, 101-105, 201-203,
The RAT control panel is installed on the Blue system ground service panel in the left rear belly fairing. It has the controls on it to retract the RAT after extension.
Included in the RAT control panel are:
-an ARM switch which supplies electrical power to the STOW selector switch. The ARM switch has a guard which sets the switch to the OFF position when it is lowered.
-
a STOW selector switch which is a 3-way center-off switch.
When the switch is moved to the right (STOW) position, power is supplied to the STOW valve solenoid of the RAT ground retraction module. The left position of the switch is not used. The switch automatically goes back to the center position when it is released.
-
a warning light which comes on (red) to indicate that the RAT ground retraction module is in the "retract" condition.
-
a TEST button to test the warning light.
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a GROUND CHECK connector which is the connection for the RAT ground test equipment.
The RAT control panel has a hinged cover. A quick-release fastener fastens the cover. It is not possible to close the cover when the guard of the ARM switch is in the ON position. The cover has a transparent window so that the warning light can be seen when the cover is closed.
R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
The RAT control panel is a switch box for the retraction of the RAT on the ground.
The RAT control panel has:
-an ON/OFF switch to switch off 28 V DC,
-
a STOW/RESET switch,
-
a residual pressure warning light,
-
a RAT stow indicator light,
-an interlock warning light,
-
a lamp test switch,
-
a ground connector.
The RAT control panel has a protective cover. The cover is spring-loaded to the open position and is safetied with a quick-release fastener in the
R 1EFF : ALL 1 29-22-00Page 34 1 1 Config-1 Aug 01/05 1 1 1CES 1 closed position. A small window in the protective cover makes the warning light visible when the cover is closed.
The STOW/RESET switch operates the retraction of the RAT. The STOW/RESET switch is spring-loaded and thus moves to the center position when released.
The ON/OFF switch which switches off the 28 V DC is a toggle switch with a safety guard. It is only possible to close the protective cover when the switch and the safety guard are in the OFF position.
A pushbutton switch is installed to test the warning/ indicator lights.
**ON A/C ALL
H. Electrical and Hydraulic Override Pushbutton Switches (24XE, 2805GE)
The elec ovrd (24XE) and hyd ovrd (2805GE) pushbutton switches are installed in the flight compartment. The hyd ovrd pushbutton switch is on the HYD section of the overhead panel 40VU. The elec ovrd pushbutton switch is on the EMER PWR section of the overhead panel 21VU. Both pushbutton switches make it possible for the flight crew to extend the RAT from the flight compartment. Both pushbutton switches have guards to stop accidental operation.
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