Flight Deck Window Heat Operation
Option – Window # 3 not heated.
The FWD WINDOW HEAT switches control heat to window No. 1. The SIDE WINDOW HEAT
switches control heat to window number 2, 4, and 5. Temperature controllers maintain
window numbers 1 and 2 at the correct temperature to ensure maximum strength of the
windows in the event of bird impact. Power to window numbers 1 and 2 is automatically
removed if an overheat condition is detected. A thermal switch located on window 5 opens
and closes to maintain the correct temperature of window numbers 4 and 5.
Option – Window # 3 heated
The FWD WINDOW HEAT switches control heat to window number 1. The SIDE WINDOW
HEAT switches control heat to window numbers 2, 3, 4 and 5. Temperature controllers
maintain windows numbers 1 and 2 at the correct temperature to ensure maximum strength
of the windows in the event of bird impact. Power to window numbers 1 and 2 is
automatically removed if an overheat condition is detected. Thermal switches, located on
window numbers 3 and 5, open and close to maintain the correct temperature of window
numbers 3, 4, and 5.
