Piper Aircraft Corporation Cherokee 140 PA-28-140, Service Manual

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(f) Cable Fittings.
1 100 Hour Standard Inspection.
Check swaged terminal reference marks for any indication of cable slippage within
fitting. Inspect fitting assembly for distortion and/or broken strands at the terminal.
Check 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.
Pay particular attention to corrosion and “pitting” on cable terminals, turnbuckles
and cable fittings. Any corrosion or pitting found requires replacement of the
corroded fitting and/or cable.
2 100 Hour Special Inspection.
For airplanes 15 years old or older, using a 10X magnifier, visually inspect the entire
surface of each cable terminal, turnbuckle, or other cable fitting for corrosion or
cracking. Inspect under safety wire or clips wrapped around the cable or fitting. Any
evidence of corrosion or cracking, however minute, is cause for replacement. A
logbook entry documenting the replacement of a cable terminal, turnbuckle, or other
cable fitting relieves the inspection requirement for that fitting only, until such time
as that fitting has been in service for 15 years.
(g) 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 align-
ment to prevent the cable from riding on flanges and chafing against guards, covers, or
adjacent structure. Check all pulley brackets and guards for damage, alignment, and
security.
(h) 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 3-17.
(18) EXHAUST SYSTEM INSPECTION. (Refer to Figure 3-18 thru 3-19.)
WARNING: A VERY THOROUGH INSPECTION OF THE ENTIRE EXHAUST SYSTEM,
INCLUDING EXHAUST HEATER SHROUD ASSEMBLY, MUFFLER AND
MUFFLER BAFFLES, STACKS AND ALL EXHAUST CONNECTIONS AND
WELDS MUST BE ACCOMPLISHED AT EACH 100 HOUR INSPECTION.
The possibility of exhaust system failure increases with use. It is recommended that the system
be checked more carefully as the number of hours increase, therefore inspection at the 700
hour period, that the exhaust system has been in use would be more critical than ones in the
100 hour period. The system should also be checked carefully before winter operation when
the cabin heat will be in use.
NOTE: Piper recommends that all PA-28 airplanes be fitted with a new muffler at or near the
1000 hour period of which the muffler has been used.
PIPER CHEROKEE SERVICE MANUAL
III - INSPECTION 01/31/08
3K6