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Mid-Mount Ascendant Aerial Tower / 1-19
SAFETY
1-10.4 Aerial Operation around Structures
1-10.4a Approaching Structures
Your aerial is designed to handle loads in only the downward direction. It will be damaged if it is loaded by resting
the tip on a structure and then depressing the aerial, or by using it to span a structure like a bridge. It will also be
damaged if it is rotated into a structure.
During rescue operations, always aim the tip of your device above the victim and the structure and slowly lower
toward the target. Stop the device four to six inches above the target. Personnel weight on the device will then cause
the device to settle onto or just above the structure without risking a reverse-loading condition.
1-10.4b Operating above Structures
There are times when you may wish to extend your aerial device over the top of a structure. Do not do this if there
is a risk of a flashover or sudden roof ventilation. You should never position the device over high heat or open flame
as exposure to high temperatures will weaken structural members, melt wires and hoses, and present a hazard to
personnel on the device.
If your aerial device is exposed to flames or excessive heat, remove it from service and have it inspected and
repaired.
1-10.5 Operating within Safe Level Limits
Figure 1-12: Level Indicator at 5 Degrees
1585
Your aerial device must be within a few degrees of being level for safe operation. Safe values are provided for grade
angle (front to back) and slope angle (side to side). Always observe the apparatus angle indicators before operating
your aerial to ensure that you are within safe limits. Read the level indicators by looking straight-on at them. The
center of the ball indicates the correct reading.
If you set up your apparatus with a grade (front to back), but you are still within the safe limits, then you should
operate your aerial off the front or back of the apparatus. If you set up your apparatus with a slope (side to side lean),
but you are still within the safe limits, then you should operate your aerial directly off the side. These methods will
keep the ladder from having a tilt to it while personnel are climbing, and it will keep the rungs parallel to the ground.
If you set up your apparatus on a slope you must be certain that the ground will hold the apparatus stationary and
keep it from slipping down the hill. With the tires raised, the only surfaces holding the apparatus on the slope will be
the stabilizers. Any of the following conditions may be cause for concern:
•
Mud
• Loose gravel
• Loose dirt
• Snow or ice
• Trash
• Fallen leaves
• Any other surface that does not provide good friction
Level Reading of 5°