What you will study
Understand the detector and find its connections
Follow the engine sensing tube to the pneumatic responder and its separate integrity/alarm contacts. Locate the UN007 nose detector, UC006–UC010 cabin detectors and their own power circuits. Read detector LED states in the named inspection rather than treating every green or red light as the same condition.
Distinguish detection checks from warning-command measurements
Compare the rotary TEST switch response with separate aerosol checks at each installed cabin detector. The qualified warning-voltage example identifies the disconnected PD034/PE034 harness and keeps the held and released voltage criteria separate from live cartridge terminals.
Verify what ENG FIRE actually changes
Separate the ENG FIRE command, BOTTLE ARMED discharge control, cockpit FUEL SHUT OFF message and VD004/VE004 actuator movement. Task-specific examples compare physical valve OPEN/CLOSED/OPEN motion with separate generator, airflow and engine-rundown observations.
Preserve the extinguisher path and close the task
Locate the engine bottle, pressure indication, aft and forward nozzles and their named union connections. Keep bottle low-pressure response, agent charge and life-cycle requirements distinct. Interpret portable-extinguisher location, placard and weight records, then retain protection, mounting, reconnection and restoration checks.
Learning outcomes
- Identify the engine, nose and cabin detector installed for the stated configuration.
- Explain detector integrity, alarm and task-specific LED indications.
- Compare each qualified warning-voltage phase with its own requirement.
- Distinguish a cockpit shutdown indication from observed actuator movement.
- Locate the nozzle connections and preserve the required restoration and supplier checks.
Aircraft and course applicability
Identified Model 408 engine fire detection, nose/cabin smoke detection, engine extinguishing and portable-extinguisher installations. Study references use the supplied Chapter 26 export with its December 1, 2025 effective-page list, selected Chapter 6/24 tasks and the dates of each test. Passenger, freight, optional equipment and individual task preparation are kept explicit. Complete current airframe, wiring and supplier instructions govern physical maintenance.
WWAOG provides independent training. Online completion records knowledge and simulation achievement; it does not replace observed practical qualification, employer authorization or applicable licensing. Use current aircraft-effective maintenance instructions for physical work.
