Pump Ops Chap 19 Flashcards
(29 cards)
How far should an aerial device remain from power lines of unknown voltage?
At least 50 feet (15 m)
What minimum distance must be maintained from power lines ≤350kV?
10 feet (3 m) or ideally 20 feet (6 m)
What angle should the aerial ladder be operated at when using the 75-80-80 guideline?
75° elevation
What is the recommended aerial ladder extension under the 75-80-80 guideline?
80% of full extension
What is the target nozzle pressure in the 75-80-80 guideline?
80 psi (560 kPa)
What wind speed requires caution due to trees moving and walking difficulty?
32–38 mph (51–61 km/h)
What is the maximum allowable ice thickness on an aerial device per NFPA® 1901?
1/4 inch (6 mm)
How much does 1 cubic inch of ice weigh?
0.03 lb (0.01 kg)
When operating on icy surfaces, how should the aerial device be aligned?
In line with the apparatus chassis
What distance must an aerial device avoid operating near fire streams or overspray?
Avoid positioning where streams may strike or overspray on the device
When operating on high winds, what wind speed range can deform aerials?
Winds over 39 mph (62 km/h)
What minimum distance should be maintained from the structure when placing an aerial?
Enough to finish by lowering, not extending
When are spray-curtain nozzles required to be operated?
In high-heat exposure conditions
What amount of dynamic load can shock loading involve?
Wind, vibration, falling debris, or sudden motion
When must all personnel be removed before extending or retracting an aerial ladder?
Always — due to pinch/crush hazard
What percentage of extension is ideal for stable elevated water stream operations?
80% of ladder’s extension
When operating below grade, what must be checked before deployment?
Manufacturer approval and load chart limitations
What is the load adjustment recommendation in icy or cold weather?
Decrease total weight to compensate for added ice load
What guideline applies to shock loading in cold weather?
Avoid extending/retracting iced ladders — risk of damage
What is the risk of placing a firefighter at the tip during fire stream application?
May be struck by the stream or cause aerial damage
What should be the first step before raising any aerial device?
Stabilize the apparatus
How long should the operator pause before changing aerial motions to prevent hydraulic spike?
Use single motion or slowly release second function
What hazard can occur if fall protection tethers are incorrectly anchored?
Circulation cutoff leading to death during a fall
Why must waterway valves be opened or closed slowly?
To prevent shock loading or water hammer
