B767 Cargo Heat 6b663n
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Smartcockpit.com
BOEING 767 SYSTEMS REVIEW
Page 1
CARGO HEAT 1. GENERAL ¡ The cargo compartment is divided into 3 compartments : - Forward - Aft controlled from the cockpit. - Bulk ¡ 2 sources of heat to heat the cargo compartments : - warm cabin air flows through the side walls to the lower compartment before being recirculated or dumped overboard. - hot bleed air under the cargo compartment floor (from the engines, APU or Ground pneumatic source)
2. NORMAL OPERATION ¡ 2 valves are located in each cargo compartment heat supply line : - 1 is a shutoff valve - 1 is a heat control valve. ¡ When the Cargo heat switch is ON, the shutoff valve is commanded open and the heat control valve opens at about 7°C and allows bleed air to flow under the associated cargo compartment floor. When the cargo compartment is sufficiently heated the heat control valve closes, stopping the bleed air flow.
3. BULK CARGO HEAT / VENTILATION ¡ Selection of NORM or VENT is based on the required heat for the bulk cargo compartment ¡ NORM position : the heat valve allows bleed air to flow into the bulk cargo compartment to keep the temperature > 7°C. ¡ VENT position : - It operates the heat control valve in the same way but keeps the compartment temperature > 18°C. - To provide air within the compartment, VENT position also turns on a compartment ventilation fan that draws cabin discharge air into the bulk cargo compartment. If an overheat occurs, the Ventilation fan runs with the selector in either the NORM or VENT position. 4.
FAULTS ON
OVHT
- ON : provides power for heat valves to cycle open and closed for automatic temperature control. - OVHT (amber) : Cargo compartment temperature > standard control range & shutoff valve signaled closed.
Copyright Smartcockpit.com Ludovic ANDRE / version 00
Smartcockpit.com
BOEING 767 SYSTEMS REVIEW
CARGO HEAT
Copyright Smartcockpit.com Ludovic ANDRE / version 00
Page 2
Smartcockpit.com
BOEING 767 SYSTEMS REVIEW
CARGO FIRE DETECTION
Copyright Smartcockpit.com Ludovic ANDRE / version 00
Page 3
BOEING 767 SYSTEMS REVIEW
Page 1
CARGO HEAT 1. GENERAL ¡ The cargo compartment is divided into 3 compartments : - Forward - Aft controlled from the cockpit. - Bulk ¡ 2 sources of heat to heat the cargo compartments : - warm cabin air flows through the side walls to the lower compartment before being recirculated or dumped overboard. - hot bleed air under the cargo compartment floor (from the engines, APU or Ground pneumatic source)
2. NORMAL OPERATION ¡ 2 valves are located in each cargo compartment heat supply line : - 1 is a shutoff valve - 1 is a heat control valve. ¡ When the Cargo heat switch is ON, the shutoff valve is commanded open and the heat control valve opens at about 7°C and allows bleed air to flow under the associated cargo compartment floor. When the cargo compartment is sufficiently heated the heat control valve closes, stopping the bleed air flow.
3. BULK CARGO HEAT / VENTILATION ¡ Selection of NORM or VENT is based on the required heat for the bulk cargo compartment ¡ NORM position : the heat valve allows bleed air to flow into the bulk cargo compartment to keep the temperature > 7°C. ¡ VENT position : - It operates the heat control valve in the same way but keeps the compartment temperature > 18°C. - To provide air within the compartment, VENT position also turns on a compartment ventilation fan that draws cabin discharge air into the bulk cargo compartment. If an overheat occurs, the Ventilation fan runs with the selector in either the NORM or VENT position. 4.
FAULTS ON
OVHT
- ON : provides power for heat valves to cycle open and closed for automatic temperature control. - OVHT (amber) : Cargo compartment temperature > standard control range & shutoff valve signaled closed.
Copyright Smartcockpit.com Ludovic ANDRE / version 00
Smartcockpit.com
BOEING 767 SYSTEMS REVIEW
CARGO HEAT
Copyright Smartcockpit.com Ludovic ANDRE / version 00
Page 2
Smartcockpit.com
BOEING 767 SYSTEMS REVIEW
CARGO FIRE DETECTION
Copyright Smartcockpit.com Ludovic ANDRE / version 00
Page 3
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