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Here is the whole Rule for reference: But I will unpack everything in the next few pages:
T.8.1 Critical Fasteners
A fastener (bolt, screw, pin, etc) used in a location specified in the applicable rule
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T.8.2 Critical Fastener Requirements
T.8.2.1 Any Critical Fastener must meet, at minimum, one of the following:
SAE Grade 5 -
Metric Grade 8.8 -
AN/MS Specifications
Equivalent to or better than above, as approved by a Rules Question or at Technical Inspection
T.8.2.2 All threaded Critical Fasteners must be one of the following:
Hex head
Hexagonal recessed drive (Socket Head Cap Screws or Allen screws/bolts)
T.8.2.3 All Critical Fasteners must be secured from unintentional loosening with Positive Locking Mechanisms see T.8.3
T.8.2.4 A minimum of two full threads must project from any lock nut.
T.8.2.5 Some Critical Fastener applications have additional requirements that are provided in the applicable section.
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T.8.3 Positive Locking Mechanisms
T.8.3.1 Positive Locking Mechanisms are defined as those which:
Technical Inspectors / team members can see that the device/system is in place (visible).
Do not rely on the clamping force to apply the locking or anti vibration feature.
Meaning If the fastener begins to loosen, the locking device still prevents the fastener coming completely loose
T.8.3.2 Examples of acceptable Positive Locking Mechanisms include, but are not limited to:
Correctly installed safety wiring
Cotter pins
Nylon lock nuts (where temperature does not exceed 80°C)
Prevailing torque lock nuts
Lock washers, bolts with nylon patches and thread locking compounds (Loctite®), DO NOT meet the positive locking requirement.
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T.8.4 Requirements for All Fasteners
Adjustable tie rod ends must be constrained with a jam nut to prevent loosening.
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