Original Flight Hardware: Environmental Control System (ECS) (Sub-Panel)

The Environmental Control System (ECS) sub-panel is part of the large pneumatics panel located on the upper flight engineer station of the Lockheed L-1011. The panel is the measurement brains of the ECS. Here is a description of the various elements. Please note that today I don't have a Plack Flow Indicator (top left instrument).

Lets walk through the panel elements top left to bottom right:

• PACK FLOW INDICATOR ... indicators air output rate of selected pack (selected by the switch to the right of the pack flow indicator.
• PACK SELECT SWITCH ... selects the individual pack for flow and temperature indication.
• ECS TEMPERATURE INDICATOR ... indicates the temperature for position selected by pack selector switch (to the left) and ECS temperature selector switch (to the right).
• ECS TEMPERATURE SELECTOR SWITCH ... the temperature of each position is indicated on the ECS temperature indicator for the selected pack.
• COOL AIR OVERBOARD SWITCH ... controls overboard cooling air valves form galley and avionics compartments. IN - CLOSE is extinguished; opens galley overboard valve and arms both avionics compartment valves to open if flow is restricted. Both avionics valves open on the ground. OUT - CLOSE is illuminated and all three valves close.
• ECS MONITOR AVIONICS AIRFLOW INDICATORS ... OVBD is illuminated when respective cooling air overboard valve is open. LO FLO is illuminated when air in ventilation duct is too warm or flow is restricted (fans are operating).
• CARGO HEAT SWITCHES ... IN - recirculating fan motor is controlled by temperature sensing switch. COLD is illuminated when temperature is below minimum limit. When temperature exceeds maximum limit, HOT is illuminated and fan is turned off. OUT - recirculating fan is turned off and HOT is extinguished. COLD is illuminated if temperature is below minimum limit.
• CABIN AIR TEMPERATURE INDICATOR ... temperature of zone or duct for the position selected on cabin zone temperature selector (to the right) is indicated.
• CABIN ZONE TEMPERATURE SELECTOR ... temperature for selected zone or duct position is shown on cabin temperature indicator.
• ZONE/DUCT TEMPERATURE SELECTOR SWITCH ... IN - DUCT is illuminated. Temperature of selected zone discharge duct air is shown on cabin air temperature indicator. OUT - ZONE is illuminated. Temperature of selected zone is shown on cabin temperature indicator.