(2)
Remove the warning notice(s).
(3)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
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NLG Proximity Sensors
Figure 605/TASK 32-31-73-991-015- 12 (SHEET 1)
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NLG Proximity Sensors
Figure 605/TASK 32-31-73-991-015- 22 (SHEET 2)
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FREE FALL EXTENSION - DESCRIPTION AND OPERATION
_______________________________________________
1. General_______
A mechanical free-fall system extends the L/G if the normal extension and
retraction system (Ref. 32-31-00) is not servicable.
The free-fall system releases the door and L/G uplocks. A mechanically operated valve isolates the hydraulic supply. Other mechanically operated valves let fluid move in the hydraulic components of the normal extension and retraction system. This prevents cavitation and hydraulic locks.
The L/G doors are opened by the L/G weight and aerodynamic force. Gravity extends the L/G, which is held and locked in the extended position. When the L/G is extended by the free-fall system, the L/G doors stay open. When the control handle of the free-fall system is reset, the Green hydraulic system is pressurized. The L/G control lever can then be set to the DOWN position to close the L/G doors and set the L/G.
2. Component Location__________________
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN I FUNCTIONAL DESIGNATION I PANELIZONEIACCESS I ATA I I I I DOOR I REF. -------------------------------------------------------------------------------HANDLE ASSY-FREE FALL CONTROL 211/ 32-33-11
212
2515GM CUT-OUT VALVE - L/G FREE FALL 147 32-33-12
2516GM VENT VALVE-MAIN L/G 148 32-33-15
2532GM VENT VALVE-NOSE L/G 124 32-33-14
3. System Description__________________
(Ref. Fig. 001, 002)
The free-fall extension-handle is at the rear of the cockpit center pedestal. A system of rods, cables and bellcranks connect the free-fall extension-handle to:
-
the L/G door uplocks
-
the L/G uplocks
-
the vent valves and a cut-out valve.
When the free-fall extension-handle is turned it operates the L/G components in the sequence that follows:
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Free-Fall Extension
Figure 001 (SHEET 1)
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Free-Fall Extension
Figure 001 (SHEET 2)
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Free-fall Extension - Schematic
Figure 002
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-
the cut-out valve closes to isolate the pressure supply and connect it to return
-
the vent valves operate to bypass the normal L/G extension system
-
the L/G and the L/G door uplocks release.
Shear devices protect the L/G system if either the L/G door or release mechanism jam when the free-fall system is operated.
The free-fall extension system has:
-a mechanical system in the MLG and NLG bays
-
hydraulic components which have an interface with the Green hydraulic system.
A.
Mechanical System
(1) MLG
In the RH MLG bay, the mechanical linkage connects to:
-
the cut-out valve (2515GM)
-
the MLG uplock (2510GM)
-
the MLG door uplock (2520GM).
In the LH MLG bay, the mechanical linkage connects to:
-
the MLG vent valve (2516GM)
-
the MLG uplock (2509GM)
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