Fire Apparatus Driver/Operator Chapter 8 + 9

Inspection Process

• The first step in the inspection process is to conduct a visual examination of the apparatus for any visible issues.
• Apparatus should be parked on a level surface to ensure accurate inspections and safety during the process.

Tire Specifications

• Turning axles require a minimum tread depth of 4/32 inches for proper traction and safety.
• Drive axle tires must have a minimum tread depth of 2/32 inches.

Mechanic Responsibilities

• A mechanic should service the steering wheel if there are signs of play or unusual noises.
• Fluid levels to check periodically by an FD mechanic include engine oil, coolant, transmission fluid, and brake fluid.

Engine and Fluid Checks

• Drivers should conduct inspections before each shift to ensure all systems are functioning properly.
• The engine oil level should be checked when the engine is cold for an accurate reading.
• Diesel Exhaust Fluid (DEF) is composed of 67.5% deionized water and 32.5% urea.

Control and Brake Systems

• Exterior functional control switches operate various components such as lights and sirens.
• The parking brake must hold the apparatus on a grade of 20% as per NFPA 1901 requirements.
• If the brakes do not hold as required, the apparatus should be taken out of service until repairs are made.

Air Brake System

• The minimum pressure required for the air brake system to build up is 90 PSI.
• An audible alarm should sound if the pressure drops below 60 PSI during the air brake system test.
• Parking brakes should engage at a minimum pressure of 40 PSI according to air brake system standards.

Safety and Operational Protocols

• Overriding a safety system should only be done in emergency situations where specific protocols have been followed.
• The required stopping distance for vehicles moving at 20 mph is 25 feet according to National Federal Motor Carrier regulations.
• A 360 inspection should be performed before moving the apparatus to ensure all safety measures are in place.

Engine and Electrical Systems

• The operational power to the chassis is delivered by the vehicle's electrical system, often involving multiple batteries.
• If the engine does not start within 30 seconds, efforts should be ceased to avoid potential damage.
• The most fundamental task of a driver is ensuring the safety of the apparatus and its crew.

System Check and Alarm Parameters

• A system check sequence is a predetermined order of checks that ensures all components are functioning correctly.
• Normal operating pressure for air brake systems is typically around 100-120 PSI.
• In a 12 V system, an alarm sounds if the voltage drops below 11.0 volts for more than 120 seconds; for a 24 V system, the threshold is 22.0 volts.

Station Protocols and Engine Operation

• A speed limit of 5 mph is generally recommended when pulling out of the station to ensure safety.
• The engine should be allowed to warm up for 5-10 minutes when possible before operating.
• Fuel levels should not fall below a quarter tank to prevent operational issues.