Equipment Cooling

Question 1

EQUIPMENT COOLING OFF light

Answer 1

• illuminated if:
• low airflow detected in the respective fan duct due to fan failure
• failure of internal sensor BITE on power up
• the sensor or filter is dirty, or
• overboard exhaust valve fails (exhaust OFF light only)
  opens with less than 2.5PSID cabin pressure (or on the ground)

Question 2

EQUIPMENT COOLING switch

Answer 2

-	two fan sets: supply and exhaust
NORMAL 
-	normal cooling fan activated 
ALTERNATE 
-	alternate cooling fan activated