Standard Practice - Type Particulat
TTP
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B1-L1
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ATA20
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Cessna
172
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B2-L1
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Chapter 20 describes standard maintenance practices
and safety precautions applicable to all aspects of the airframe and related
systems.
1. Material and Tool Cautions describes general cautions
and warnings applicable to maintenance on or around the airplane.
2. Torque Data
provides tables, formulas, requirements and torque limits for various type fasteners.
3. Safetying describes the proper methods and use of
safety wire/lockwire, cotter pins and lock clip installations.
4. Solvents describes characteristics of solvents which
are commonly used during
maintenance, cleaning and inspection of various
airframe and related components.
PTP
Cessna
172
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B1
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LOC
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SGH
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B2
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LOC
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SGH
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Torque Data To ensure security of installation and prevent over
stressing of components during installation, the torque values outlined in MM should be used during
installation and repair of components.
Torque value tables, in Ch.20,
are standard torque values for the nut and bolt combinations shown. If a
component requires special torque values, those values will be listed in the maintenance practices section.
Free Running Torque Value. is the torque value
required to rotate a nut on a threaded shaft, without tightening. Free running
torque value does not represent the torque values listed in the tables of this
section. Torque values listed in the tables represent the torque values above free
running torque.
Breakaway torque value is the value of torque required to start a nut rotating
on a thread shaft, and does not represent free running torque value. It should
be noted that on some installations the breakaway torque value cannot be
measured.
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