The waste water is moved to the drain masts through gravity on the ground and differential pressure in flight.
B. Each drain mast assembly has:
-an aluminum alloy housing (aerodynamic shape),
-a drain tube with integrated electrical heating-elements,
-
an PTC temperature sensor (measures the ambient temperature),
-
an over temperature switch (prevents damage to heating element),
-A flange for installation of the drain mast is part of the top of the fairing. Two ice protection control units 5DU and 15DU control the 115 V AC 400Hz single Phase to the related heater of the drain masts. The drain mast heating element operates from -55 deg C (-65 deg F) to +75 deg C (+160 deg F). The overtemperature switch installed in the drain mast will stop the power supply if the temperature increases above +120 deg C (+250 deg F).
R The waste water drain-lines to the drain masts have heater assemblies
R which are installed on the drain lines with bonding tape. The drain lines are installed on supports and tightened with clamps and covered with insulation.
R C. Ice-protection control unit 3DW and related sensor 40DU control the drain R line heaters 41DU and 42DU to the drain mast. These components keep the R temperature of the drain tube between +6 deg C (+43 deg F) to +10 deg C R (+50 deg F).
D. Each heater has:
-a self limiting element,
-two power supply conections,
-an inner insulation,
-a copper shield (ground bonding connection),
-an outer protection sheath.
E. Each sensor has:
-
a ceramic and epoxit housing,
-
a sensing chip (contains a thermister),
-two connection pins, The value of the thermister depends on the set temperature of the waste water lines.
**ON A/C 151-199,
A. The waste water is discarded through the drain lines to the fwd heated drain mast 4DU and the rear heated drain mast 14DU to atmosphere, which are installed on the lower fuselage shell. The waste water is moved to the drain masts through gravity on the ground and differential pressure in flight.
B. Each drain mast assembly has:
-an aluminum alloy housing (aerodynamic shape),
-a drain tube with integrated electrical heating-elements,
-
an PTC temperature sensor (measures the ambient temperature),
-
an overtemperature switch (prevents damage to heating element),
-A flange for installation of the drain mast is part of the top of the fairing.
C. Two ice protection control units 5DU and 15DU regulate the 115 V AC 400Hz single phase to the related heater of the drain mast. The drain mast heating element operates from -55 deg C (-65 deg F) to +75 deg C (+160 deg F). The overtemperature switch installed in the drain mast will stop the power supply if the temperature increases above +120 deg C (+250 deg F). The waste water drain lines to the drain masts have heater assemblies which are installed on the drain lines with bonding tape.
R The drain lines are installed on supports and tightened with clamps and
R covered with insulation.
R Ice protection control unit 3DW and related sensor 141DU control the
R drain line heaters 142DU, 48DU and 49DU to the FWD drain mast, keeping
R the temperature of the drain tube between +6 deg C (+43 deg F) to +10 deg
R C (+50 deg F).
R D. Each heater has:
R - a self limiting element,
R - two power supply conections,
R - an inner insulation,
R - a copper shield (ground bonding connection),
R - an outer protection sheath.
R E. Each sensor has:
R - a ceramic and epoxit housing,
R - a sensing chip (contains a thermister),
R - two connection pins,
R The value of the thermister depends on the set temperature of the waste
R water lines.
R
R **ON A/C 201-210,
R A. The waste water is discarded through the drain lines to the fwd heated
R drain mast 4DU and the rear heated drain mast 14DU to atmosphere, which
R are installed on the lower fuselage shell.
R The waste water is moved to the drain masts through gravity on the ground
R and differential pressure in flight.
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本文链接地址：A320飞机维护手册 AMM ICE AND RAIN PROTECTION 防冰和排雨2(49)
