Apparatus L-7 Rearmount aerial ladder Flashcards
The 100′ Aerial Ladder operates by utilizing two double acting hydraulic lift cylinders which provide smooth, precise elevation from ____ degrees above horizontal.
1.2
0-80 degrees above horizontal.
How many feet do the stabilizers extend on each side of the aerial ladder?
1.6
5’ 2” each side
The power for operating the ground stabilizers, aerial ladder hoisting, extension and
rotation is derived from the apparatus engine through a transmission mounted Power
Take Off (PTO). Activation of the PTO sends power from the what to what?
2.1
Activation of the PTO sends power from the transmission to the hydraulic system instead of the apparatus drive train.
Stabilizer Controls - Hydraulically “H” frame stabilizers are located behind the rear wheels. The controls for these stabilizers are located at the back of the apparatus in the Stabilizer Control Compartment, one control handle for each stabilizer. The stabilizers each require a clearance of 5′ 2″ for full horizontal extension. The extension of the stabilizers are a 1 or 2 FF operation?
3.1
The operator can view the stabilizer in motion permitting a one firefighter operation.
The Interlock Diverter Valve (IDV) performs two functions. The IDV directs the flow of hydraulic fluid to power either the stabilizers or the aerial ladder. The stabilizers must have a positive pre-load before the aerial can become operational. When the ground stabilizers are loaded vertically, the aerial interlock valve opens and allows movement of the aerial ladder. When the ladder is moved from the cradle, it closes the stabilizer interlock valve and prevents movement of the stabilizers. This valve will not permit operation of the aerial ladder unless what are properly set?
3.2.3
This valve will not permit operation of the aerial ladder unless the ground stabilizers are properly set. It will also not permit nesting of the ground stabilizers unless the aerial is properly bedded.
Move the STABILIZER CONTROL HANDLE toward the OUT/DOWN position until the stabilizer is fully extended horizontally and beginning to lower to the ground. A stabilizer that is not fully extended horizontally is considered?
3.3
Short-Jacked
Before operating the Aerial Ladder Controls, what must be done at the stabilizers?
3.3
Manual Safety Pins must be placed in the highest hole possible in the stabilizers. This will prevent collapse of the stabilizers in the event of a hydraulic fluid leak.
When the ground is not level and the apparatus is leaning, start with the stabilizer on which side of the apparatus?
3.3
When the ground is not level and the apparatus is leaning, start with the stabilizer on the lowest side first (the direction the apparatus is leaning). The low side stabilizer shall be fully extended horizontally and lowered to its maximum. The high side stabilizer shall then be extended as necessary and then lowered to a point that levels the apparatus. Utilize the Inclinometer mounted at the rear of the apparatus to aid in leveling the apparatus.If the inboard stabilizer (working side) is also the high side, it must be fully extended horizontally and then lowered the distance necessary to level the apparatus for a safe operation.
When extending the aerial we must always make sure RUNG ALIGNMENT INDICATOR light is ON before permitting personnel to climb ladder.
True of false
4.3
False
If possible make sure RUNG ALIGNMENT INDICATOR light is ON before permitting personnel to climb ladder.
Extension Footage numbers are located on the base section vertical struts and the corresponding bright colored vertical strut of the second section. When the colored strut is lined up with a footage number, the ladder is what?
4.4
The ladder is extended to that respective length.
Refer to the Inclinometer, located on the inside of the Aerial Base section, to determine the hoisted degrees of the ladder above horizontal. When we match the inclinometer and the extension footage numbers what do we get?
4.5
Always match the Inclinometer and Extension Footage numbers for proper load capacity.
General Knowledge
AERIAL EMERGENCY HYDRAULIC SYSTEM
5.1
The aerial ladder has an emergency hydraulic system. This system is to be used when the normal PTO fails or the engine shuts down, and the aerial ladder or jacks need to be used. Components of the system consist of an electrical auxiliary hydraulic pump and four emergency switches.
If the aerial or jacks can’t be moved because of a loss of hydraulic fluid, the emergency hydraulic system will still work?
True of False
5.1.1
If the aerial or jacks can’t be moved because of a loss of hydraulic fluid this emergency system may not work. However, an attempt should still be made to activate the system. The reason for the failure must be addressed before the emergency system can function.
The steps required to use the emergency system MUST be followed in a precise order. When using the emergency system, a __ ____ approach shall be taken in order for the electrical pump and batteries not to fail.
Fill in the Blanks
5.1.2
When using the emergency system, a NO RUSH approach shall be taken in order for the electrical pump and batteries not to fail. All functions will operate at a reduced rate of speed when the emergency system is activated.
The electrical pump and batteries need to do what between operations?
5.1.3
The electrical pump and batteries need a cool-down period between operations (retract ladder, cool-down period, rotate ladder, cool-down period and so on). Sometimes a cool-down period may be needed during a partially completed operation, depending on the operating conditions.
