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Old 03-28-2008, 01:16 AM   #13 (permalink)
CoptrDoctr
 

Join Date: Jan 2008
Default Hardware Installation Tips

When learning to be an aircraft mechanic I was taught some basic hardware istallation rules to follow whenever practical.

1. If the hardware (bolt/screw) is installed perpendiculary, the head (top/face) should be facing up so gravity will help keep it in place (Blade 400 main rotor blade screws).

2. If the hardware is installed horizontally and oriented with the direction of flight ( along the aircraft centerline), the head should be installed facing forward so the air pressure from the slipstream will help keep it in place.

3. Any hardware installed horizontally and its orientation is not in the direction of flight, the head position is irrelevent since no forces will act upon it to help keep it in place.

4. If the hardware is installed in a rotating part and oriented in the axis of rotation, the head shoud be installed in the direction of rotation so centrifugal force will help keep it in place (Blade 400 mast screws).

5. Any hardware installed on a rotating part and its orientation is not in the axis of rotation the head position is irrelevent since no forces will act upon it to help keep it in place.

Proper torqing and safteying (Loctite application) of hardware makes the likelyhood of hardware separation extremely rare, but these are still sound practices that apply equally to model and full size aircraft.
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