Emergency Action Plan - Urban Air Pro Zone Operation & Maintenance Manual

All keepers (R-keys, hairpins, lynch pins, etc.) must be inspected for wear. If a keeper is bent out of
shape or "sprung", it must be replaced. Hairpins are expendable parts. After repeated use, they
become worn and "sprung" as shown.
NEVER ATTEMPT TO BEND A HAIRPIN BACK INTO SHAPE. REPLACE IT WITH A NEW PART.
The correct use of a hairpin is shown. Incorrectly used hairpins are more likely to fail, and will distort
after only a few uses. Remember that the key to a safe and successful operation is to have well trained
and well supervised employees.

8. Emergency Action Plan

B
B
A
Acceptable hairpins
Dimension A equals dimension B in a relaxed
position
A
Unacceptable hairpins
Dimension A is greater than dimension Bin a
relaxed position