MTR HOT
OFF
G
F
H
T
DN
B
T
AFT SCHLT
CABLE CUT SWITCH
HOIST SPEED SEARCH.
SEARCH LIGHT CONTROL LIGHT
ARM SQUIB ON/NORMALSWITCH
C
I
OFF
ON/NVG
TEST TEST
PENDANT CABLE
CUT
PENDANT CONTROL
CREW CONTROL PANEL
AB0621
SA
Figure 4-17. Rescue Hoist System
CONTROL/ FUNCTION
INDICATOR
FULL OUT light Illuminates when the hoist cable is
in the full out position.
MTR HOT light Indicates that the hoist motor is hot.
The hoist will operate at a reduced
rate to permit cool down.
UP-OFF-DN Hoist speed and direction are
thumbwheel controlled via the amount and
direction of thumbwheel de.ection.
The thumbwheel is spring loaded to
the center OFF position.
SCHLT switch Controls the direction of the search
light.
FWD Pressing switch to the FWD
position moves hoist searchlight
forward.
AFT Pressing switch to the AFT
position moves hoist searchlight
rearward.
LEFT Pressing switch to the LEFT
position moves hoist searchlight to
the left.
RIGHT Pressing switch to the RIGHT
position moves hoist searchlight to
the right.
CABLE-FEET Indicates the amount of cable that
length indicator has been reeled out.
4.9.4 Hoist Operation. The rescue hoist system may be operated from controls located in the cabin or in the cock-pit. The pilot can override the crewmember’s controls. The HOIST POWER switch in cockpit must be in the ON position in order to operate the rescue hoist. Operation of the rescue hoist system is controlled through the rescue hoist control panel in either of two ways:
NOTE
All controls have automatic slow speed prior to the automatic stop at the cable extremes.
Power will be removed from environmental control system (ECS) when HOIST POWER switch is placed ON. Do not oper-ate the rescue hoist while operating the ECS.
Power will be removed from environmental control system (ECS) when APU is source of helicopter power and backup pump is op-erating.
Rescue hoist operational daily checks prior to use and after use require that the backup pump be off to facilitate use with APU power.
1.
The primary method is from the cabin by means of the crewmember’s pendant, which can con-trol the hoist in either direction at any speed up to 350 fpm, depending on the thumbwheel po-sition, it is spring-loaded to the OFF position.
2.
The secondary method is from the cockpit by means of the PILOT OVERRIDE switch which controls the hoist in either direction at a .xed speed. The pilot’s controls have priority over the crewmember’s pendant.
4.9.5 Hoist Cable Shear System.
Cable cut will not work from any station unless hoist power is on, and crew ARM -TEST switch is placed to ARM. There is no pilot override function for the ARM -TEST switch.
The rescue hoist shear capability is active on the ground.
The rescue hoist shear relay can be energized either from the cabin rescue hoist panel CABLE CUT switch or the CABLE CUT switch from the cockpit. Activating either switch .res an explosive cartridge that shears the hoist cable. If the lower console HOIST POWER switch is at OFF, neither CABLE CUT switches are operative. Power is provided from the dc essential bus through a circuit breaker marked HOIST CABLE SHEAR.
4.9.6 Rescue Hoist Operational Check.
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