TM 55-1680-320-23&P
Change 8 2-9
2-7.
OPERATIONAL PERFORMANCE CHECK (cont)
2-7
a. Connect power source to helicopter. Close rescue hoist CONT and POWER circuit breakers on pilot over-
head console.
NOTE
Blue POWER ON light should be on and blower fan shall be operating.
b. Using pilot boom control switch, rotate the boom in, then out. Observe the 205 degree swing for proper
operation.
NOTE
When rescue hoist is installed on left side of aircraft, pilot boom switch operates in reverse.
c. Using pilot boom control switch, rotate the boom in, then out. Observe the 205 degree swing for proper
operation.
CAUTION
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 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 an improvised drum of
at least 9” diameter.
NOTE
Observe that the amber CAUTION light 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. The operator of the pilot hoist control switch must limit cable travel operation to within the first 10 feet and
stop. The hoist control pendant operator will immediately resume operation until cable hook is reeled out.
NOTE
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 activated) and resume operation when
arm is released.
NOTE
Observe that the amber CAUTION light comes on when the cable hook is within 10 feet of the boom head.
Ensure cable speed decelerates (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. The operator of the pilot hoist control switch must limit cable travel operation to within 10 feet of all out (250
feet) and stop. The hoist control pendant operator will immediately resume operation until the cable hook is
reeled in.
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