engineer other stuff

pre trip, brake test... etc

slack adjusters

1”-2” and equal both sides

cut in minimum

85psi

cut out maximum

130psi

static test

no more than 2 psi drop in 60 seconds

applied brake test

no more than 3 psi drop in 60 seconds

low air alarm

audible and visual alarm 55 to 75 psi

spring brake test

20 to 45 psi

high idle recovery

@ 1200rpm, fill from 85 to 100psi in less than 45 seconds

tug test

park brake on in drive at 1000rpm

brake test

at <5mph, no hands, apply brake and verbalize any abnormal movements.

Kestrel and weather reading

Kestrel

Advantages:

Reduces user error

Real time data

Trend tracking

Heat index and wind chill

Disadvantages:

Can be damaged heat dust and water

Require batteries

May require calibration

Weather spinning:

-Hang thermometer outside of pack to adjust to temp

-measure wind speed and direction with wind gauge and compass

-saturate wet bulb wick

-face wind and spin for one minute. Note wet bulb temp. Spin for another 50 time and note again. Note temp ant lowest point until it no longer changes. Record wet bulb temp.

-read and record dry bulb

-cross reference tables for relative humidity and dew point. Check elevation ranges for correct table. Record.

Report findings

Fire weather recordings include:

Date

Location

Elevation

aspect

Time

Dry bulb

Wet bulb

Relative humidity

Wind speed

Wind direction

Water tender shuttle calc

Flow rate (gpm) = 0.9 x tank size(TS) / trip time

Brake lag

Air brakes delay from brake pedal application to drum brakes activation.

0.4-0.5 seconds

At 60 mph that’s ~40 ft of travel