737 MAX Flight Crew Operations Manual
Fire Protection -
System Description
MN-FLT-OH-201
8.20.7
Cargo Fire-Suppression System Schematic
Lavatory Fire Protection
Lavatory fire protection consists of these systems:
• lavatory smoke detection
• lavatory fire extinguishing (heat activated).
Lavatory Smoke Detection
The lavatory smoke detection system monitors for the presence of smoke. When
smoke is detected:
• an aural warning sounds
• the red status indicator light on the lavatory smoke detector panel
illuminates.
• there is no flight deck indication. The alarm is manually silenced at the
activated detector, and the system will reset automatically when no
smoke has been detected for 30 seconds.
Lavatory Fire Extinguisher System
A fire extinguisher system is located beneath the sink area in each lavatory. When
a fire is detected:
• fire extinguisher operation is automatic
• flight deck has no indication of extinguisher discharge.
Fire and Overheat System Tests
The fire and overheat detection systems can be tested by pushing and holding the
FAULT/INOP and OVHT/FIRE TEST switch. Extinguisher continuity can be
tested by pushing and holding the EXT TEST switch. All test indications clear
when switches are released.
DUAL LOOP AREA
SMOKE DETECTORS
FWD CARGO COMPARTMENT
AFT CARGO COMPARTMENT
DISCHARGE TUBING/NOZZLES
FIRE
BOTTLES
March 1, 2021
