Corrosion Of Cables; Cable Maintenance; Cable Fittings; Pulleys/Pulley Wear Patterns - Piper PA-44-180 SEMINOLE Maintenance Manual

CORROSION
Carefully examine any cable for corrosion that has a broken wire in a section not in contact with wear pro-
ducing airframe components such as pulleys, fairleads, etc. It may be necessary to remove and bend the cable
to properly inspect it for internal strand corrosion as this condition is usually not evident on the outer surface
of the cable. Replace cable segments if internal strand rust or corrosion is found.
Areas especially conducive to cable corrosion are battery compartments, lavatories, wheel wells, etc.,
where concentrations of corrosive fumes, vapors, and liquids can accumulate.
Check all exposed sections of cable for corrosion after a clean-
ing and/or metal-brightening operation has been accomplished
in that area.

CABLE MAINTENANCE

Frequent inspections and preservation measures such as rust prevention treatments for bare cable areas will
help to extend cable service life. Where cables pass through fairleads, pressure seals, or over pulleys, remove
accumulated heavy coatings of corrosion prevention compound. Provide corrosion protection for these cable
sections by lubricating with a light coat of graphite grease or general purpose, low-temperature oil.
A V O I D U S E O F V A P O R D E G R E A S I N G , S T E A M
C LE A NIN G, M E T H Y L E T H Y L K E TONE (MEK) OR
OTHER SOLV E N T S T O R E M O V E C O R R O S I O N -
P R E V E N TATIVE COMPOUNDS, AS THESE METHODS
WILL ALSO REMOVE CABLE INTERNAL LUBRICANT.

CABLE FITTINGS

Check swaged terminal reference marks for an indication of cable slippage within fitting. Inspect fitting
assembly for distortion and/or broken strands at the terminal. Assure that all bearings and swivel fittings (bolted
or pinned) pivot freely to prevent binding and subsequent failure. Check turnbuckles for proper thread exposure
and broken or missing safety wires/clips.
PULLEYS
Inspect pulleys for roughness, sharp edges, and presence of foreign material embedded in the grooves.
Examine pulley bearings to assure proper lubrication, smooth rotation, freedom from flat spots, dirt, and paint
spray. Periodically rotate pulleys, which turn through a small arc, to provide a new bearing surface for the
cable. Maintain pulley alignment to prevent the cable from riding on flanges and chafing against guards, cov-
ers, or adjacent structure. Check all pulley brackets and guards for damage, alignment, and security.
PULLEY WEAR PATTERNS
Various cable system malfunctions may be detected by analyzing pulley conditions. These include such
discrepancies as too much tension, misalignment, pulley bearing problems, and size mismatches between
cables and pulleys. Examples of these conditions are shown in Figure 27-5.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
– NOTE –
– CAUTION –
1K7
27-00-00
Page 27-5
Added: June 20, 1995