SIGMA projetor - Manual (Page 30)

DAILY INSPECTION INSTRUCTIONS
3.8
2 Control Conduit Inspection:
a. Inspect the control conduit where it is swaged onto the fittings that mount on the control crank.
There should be no evidence of cracks or breaks in the PVC sheath. Also, look for bulges in that
area that result from repeated flexing.
b. Visually inspect the entire length of both control conduits looking for dents, cuts and thermally
damaged areas. During this inspection, the radiographer should use his hands to feel for inward
dents. Cuts and melted areas found on the control conduits should be sealed with PVC tape to
prevent against the ingress of water.
c. Inspect the control conduits where they are swaged to the swage fittings that are mounted to the
connecting plug assembly. There should be no evidence of cracks, breaks or bulges in the PVC
sheath.
d. Remove the protective cover from the connecting plug assembly. Inspect the connecting plug
assembly to verify the movable jaws are not excessively loose and the connecting collar pins are
not excessively loose or bent. Check the control sheath swage fittings to verify they are not loose
where they are joined to the connecting plug assembly.
3 Control Cable Inspection:
a. Inspect the control cable connector as it protrudes out of the connecting plug assembly. The
control cable connector should not be bent or at an angle exceeding 15 degrees relative to the
control cable centerline. If a control cable connector is repeatedly bent at an angle greater than
15 degrees, damage to the control cable may be introduced by straightening the bend. Inspect
the control cable (male) connector to verify that the stem and ball of the connector are not bent or
cracked. Using hand pressure, attempt to twist the control cable connector from the control
cable. If the control cable connector can be twisted using hand pressure or appears bent or
cracked, remove from service and label as defective.
b. Pull approximately 12 in (30.5 cm) of control cable out of the connecting plug assembly and
inspect for the following anomalies directly behind the connector:
• Cuts, breaks, nicks or fraying of the spiral windings of the control cable.
• Areas with kinks or permanent bends.
• Rust (a red oxide) on the inner core of the control cable.
• Uniformity of the spacing between the outer spiral windings. Also check for flattened areas
and wear.
• Bend the connector section of control cable back towards itself and release the cable to test
for flexibility or ‘spring’ of the control cable. A cable that has been subjected to the flexibility
test and remains in the bent position after the test provides an indication of internal corrosion
and must be removed from service.
• Verify that a light coating of mil-spec grease is present on the control cable. The light coating
of grease is necessary to prevent the penetration of water and chemicals that can oxidize and
permanently damage the control cable.
c. Check for freedom of movement of the control cable within the remote controls by moving the
control crank handle back and forth approximately one-quarter turn. During this test, take care to
avoid cranking the control cable onto the ground exposing it to dirt and sand. If any resistance is
felt during this check, re-inspect the control conduits for dents or depressions. If dents are not
present on the remote control conduits, the control cable may be rusted stiff somewhere within
the control conduits. Do not use remote controls that do not function properly or exhibit defects
described above.