CARGO FIRE PANEL

Question 1

EXTINGUISHER TEST Lights

Answer 1

Illuminated (Green):

• Cargo Fire TEST switch is pushed and squib continuity is NORMAL (between panel and squibs)
• when TEST switch is pushed a low circuit signal is sent through the FWD and AFT squibs

Question 2

CARGO FIRE TEST Switch

Answer 2

PUSH: and hold

• tests circuits for both FWD and AFT cargo fire detector loops
• sends a test signal to the loops and verifies continuity of the squibs
• fire bell will sound
• MC lights DO NOT illuminate for the test

FAULT:

• if there is a squib fault the associated green light will not come on

TEST INDICATIONS:

• Bell
• FIRE WARN lts illuminate
• EXT FWD and AFT green lights come on
• FWD and AFT red switch lights come on
• amber DISCH light comes on
• [DETECTOR FAULT] amber light will NOT come on if its a good test

Question 3

DET SELECT Switches

Answer 3

• 3 positions: A - NORM - B
• 2 switches: FWD and AFT

NORM:

• loops A & B are active (dual loop design similar to OVHT/FIRE loops)
• to active smoke must be detected by A detector in loop A AND loop B (any detector in both loops - they do not have to be a pair) before alarm sounds

A / B:

• associated loop is active
• if any detector in the associated loop detects smoke an alarm will occur

Notes.

• if one detector fails in a loop it will automatically change to single loop system
  
  • in single loop mode: alarm will set off if only ONE detector senses smoke

Question 4

CARGO FIRE ARM Switches & Lights

Answer 4

Switches.

• PUSH -
  
  • FWD ARMED: extinguisher ARMED for FWD cargo compartment (white ARMED light)
  • AFT ARMED: extinguisher ARMED for AFT cargo compartment (white ARMED light)
  • cannot see the word ARMED unless you push the switch

Warning Lights.

• Illuminated (red): FWD / AFT
  
  • at least ONE detector in EACH LOOP detects smoke (if in NORM)
  • if down to a single loop - at least one detector on the remaining loop detects smoke (A or B)
  • Master FIRE WARN lights and Bell sounds
  • when you push the FWD / AFT switch you are arming the squib - then you push DISCH to fire the bottle

Indications of a Cargo Fire.

• Fire Bell
• both FIRE WARN lights
• FWD/AFT cargo fire warning light(s) illuminate

Question 5

DISCH Light and Switch

Answer 5

Light.

• Illuminated (amber): bottle has discharged
• NOT press to test (only tested by the Master Dim and Test Switch)
• may take up to 30 seconds to illuminate
• Halon 1301 pressurized with nitrogen

Switch.

• PUSH: if system is armed the bottle will discharge
• it is a HRD system (high rate discharge) to get the fire OUT
• only 1 bottle for both cargo bays
• provide fire suppression for 60 minutes (flt time) plus 15 min (fire suppression for missed appr or unloading etc)
• 2 nozzles in the ceiling of fwd cargo bay and 3 in the aft ceiling

Question 6

DETECTOR FAULT Light

Answer 6

• Illuminated (Amber):
  
  • one or more of the selected loops in EITHER cargo compartment has failed