HOT WEATHER OPERATION

Question 1

Initial considerations to keep cabin cold:

Answer 1

*PACKS ON, COOLING air supplied if OAT 40C protect electrical and electronic equipment.
*Cooling air outside source available, plug in immediately after engine shutdown, only removed before start.
*Door, windows, cargo doors, closed much as possible.
*Elec components turned off in FD
*Open Pax gasper outlets, close window shades.

Question 2

Actions dont reduce cabin temps?

Answer 2

Passenger Cabin TEMP - auto cool
Pack Switches - HIGH

Question 3

After engine start, considerations to cool cabin?

Answer 3

Pneumatic pressure from engine bleed air system not sufficient for cooling during extended grounds ops - Use APU bleed air instead to supply packs. Follow supplementary proc for this.

Question 4

Explain HOT WX Proc after start and prior TO?

Answer 4

ENG BLEED 1 OFF
ENG BLEED 2 OFF
ISOLATION VALVE OPEN
APU BLEED ON
Packs HIGH
TEMP Selectors - Auto COOL
..
Before TO
Packs AUTO
ENG BLEED 2 OFF
APU BLEED OFF
ENG BLEED 1 ON
ISOLATION VALVE AUTO
TEMP selectors as needed
..

Question 5

Considerations to help with brake temps?

Answer 5

*Brake temp buildup series short sectors - energy accumulative
*Extend LG early
*In flight cooling time - Brake cooling schedule PI QRH
FLight planning - high temps inflict performance penalties.
alternate TO proc - No engine bleed TO, Improved climb.