Section 2
MMEL Air Conditioning
REPAIR INTERVAL NUMBER INSTALLED
NUMBER REQUIRED FOR DISPATCH
ITEM REMARKS OR EXCEPTIONS
21-27 Electrical/Electronic
Equipment Cooling
Blowers
1) Non-EFIS (-100/-200/
-300/-400/-500)
C 2 1 Except for ER operations, one may be
inoperative.
2) EFIS
(-300/-400/-500)
a) Supply Fans C 2 1 Except for ER operations, one may be
inoperative.
b) Exhaust Fans C 2 1 Except for ER operations, one may be
inoperative.
3) CDS
(-600/-700/-800/-900)
B 4 3 (M) One fan may be inoperative provided:
a) All remaining fans are verified to operate
normally, and
b) Both low flow detectors are verified
operate normally.
and if you lose the fans during flight :
OPERATIONS NOTE
-100/-200/-300/-400/-500:
Verify that the operative fan is selected and the EQUIP COOLING OFF light is extinguished.
For EFIS equipped airplanes, if the EQUIP COOLING OFF light illuminates during flight (both supply fans or
both exhaust fans inoperative), continued flight beyond 90 minutes can result in loss of essential avionics.
-600/-700/-800/-900:
If the EQUIP COOLING SUPPLY OFF light illuminates during flight (both supply fans inoperative),
continued flight beyond 30 minutes can result in loss of the Captain’s Display Units and the lower center
Display Unit. If the EQUIP COOLING EXHAUST OFF light illuminates during flight (both exhaust fans
inoperative), continued flight beyond 30 minutes can result in loss of the First Officer’s Display Units and the
upper center Display Unit.
so ,you can change Displays using the selectors to the available ones.