TM 55-1680-320-23 & P
3-7. OPERATIONAL PERFORMANCE CHECK (cont)
Connect power source to helicopter.
Blue POWER ON light should be on
Close rescue hoist CONT and POWER circuit breakers on pilot overhead
and blower fan shall be operating.
Using control pendant BOOM IN/OUT switch, rotate the swinging boom out, then in. Observe the 205 degree
swing for proper operation.
When rescue hoist is installed on left side of aircraft, pilot boom switch operates in reverse.
Using pilot boom control switch, rotate the boom in, then out. Observe the 205 degree swing for proper operation.
During the following procedures, reel cable out from the boom head in line with the boom axis. Use care
not to pull cable taut against the cable guide or roller, as kinking of the cable can result. Avoid damaging
cable on rough surfaces, such as the ground.
Cable from the hoist should be fed onto cable spool (or
suitable sustitute drum of at least 9 diameter).
Observe that the amber CAUTION tight extinguishes when 10 feet of cable is unreeled. Ensure cable speed
decelerates (to approximately 67 feet per minute) when cable is within 10 feet of all out (250 feet).
d. Position the control panel HIGH/LOW SPEED switch to HIGH.
e. Using pilot hoist control switch, lower cable hook until all cable is reeled out.
During the cable reeling in procedure, push up on actuator arm to ensure proper operation of the up-limit
switch. Hoist shall stop running when arm is raised (up-limit switch actuated) and resume operation when
arm is released.
Observe that the amber CAUTION light comes on when the cable hook is within 10 feet of the boom head.
Ensure cable speed decelerate (to approximately 67 feet per minute). The cable speed shall decelerate to
approximately 12 feet per minute when the hook is within 18 inches of the boom head.
f. Using pilot hoist control switch, raise cable hook until all cable is reeled in. Depress actuator arm several times
during operation to ensure proper response.
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