A chain is unserviceable when the elongation is:
- 20 %
- 0.2 %
- 2%
Axial movement check for bearings can be:
- Rotate through 90 degrees very fast
- Tapping with a light soft hammer and cooper drift
- Lightly pulling and pushing
Aircraft construction will provide adequate protection against lightning if:
- The total resistance with adequate bonding is more that 5 ohms
- The skin is made with a copper insert
- All the skin area has less than 0.05 ohms resistance