DOC AIRBUS | AMM A320FENGINE AIR INTAKE ICE PROTECTION - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The ice protection system of the engine air intakes is normally selected only in icing conditions.
Ice protection heats the intake cowls with air bled from the engine compressor.
The function of the ice protection of the engine air intakes is to supply bleed air to heat the inlet lip during icing encounters. This maintains the inlet duct of the engine free of harmful accumulation of ice.
The installation consists of ducting, coupling, seals, a shutoff valve, mechanical supports and a swirl nozzle.
The air bled from the fifth stage of the high compressor is the heat source.
A solenoid-operated shutoff valve (which is designed to be spring loaded in the closed position in case of failure) provides the on-off control. The swirl nozzle distributes the air within the leading edge of the intake cowl. The spent air exhausts via a flush duct in the aft cavity of the intake cowl.
** ON A/C NOT FOR ALL The ice protection system of the engine air intakes is normally selected only in icing conditions.
Ice protection heats the intake cowls with air bled from the engine compressor.
The function of the ice protection of the engine air intakes is to supply bleed air to heat the inlet lip during icing encounters. This maintains the inlet duct of the engine free of harmful accumulation of ice.
The installation consists of ducting, coupling, seals, a shutoff valve, mechanical supports and a swirl nozzle.
The air bled from the fifth stage of the high compressor is the heat source.
A solenoid-operated shutoff valve (which is designed to be spring loaded in the closed position in case of failure) provides the on-off control. The swirl nozzle distributes the air within the leading edge of the intake cowl. The spent air exhausts via a flush duct in the aft cavity of the intake cowl.
2. Component Location
Ice Protection of the Engine Air Intakes - Indications on Upper ECAM Display Unit ** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL Ice Protection of the Engine Air Intakes - Indications on Upper ECAM Display Unit ** ON A/C NOT FOR ALL | FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||||
| 2DN1 | P/BSW-ANTI ICE/ENG 1 | 25VU | 210 | 30-21-00 | |
| 2DN2 | P/BSW-ANTI ICE/ENG 2 | 25VU | 210 | 30-21-00 | |
| 4000DN | VALVE-ENG AIR INTAKE ANTI ICE | 410 | 30-21-51 | ||
** ON A/C NOT FOR ALL
4. Power Supply
Ice Protection of the Engine Air Intakes ** ON A/C NOT FOR ALL
Ice Protection of the Engine Air Intakes ** ON A/C NOT FOR ALL
The supply and protection of the components is as follows:
** ON A/C NOT FOR ALL Ice Protection of the Engine Air Intakes ** ON A/C NOT FOR ALL Ice Protection of the Engine Air Intakes ** ON A/C NOT FOR ALL | ------------------------------------------------------------------------------- |
| !COMPONENT/FUNCTION ! CIRCUIT BREAKER ! BUSBAR ! |
| !--------------------------------!-----------------------------!--------------! |
| !ANTI ICE/ENG 1 pushbutton ! ! ! |
| !switch ! ! ! |
| !FAULT legend ! ! ! |
| !ON legend ! 1DN1 ! 101PP ! |
| !ENG 1 air intake ! ! ! |
| !anti ice valve ! ! ! |
| !--------------------------------!-----------------------------!--------------! |
| !ANTI ICE/ENG 2 pushbutton ! ! ! |
| !switch ! ! ! |
| !FAULT legend ! ! ! |
| !ON legend ! 1DN2 ! 202PP ! |
| !ENG 2 air intake ! ! ! |
| !anti ice valve ! ! ! |
| ------------------------------------------------------------------------------- |
5. Interface
A. Interface with the Engine Interface Unit (EIU)
- The information (ANTI ICE pushbutton switch configuration) is sent to the EIU which transmits it to the FADEC by an ARINC 429 bus (label 032 bit 22). The FADEC uses this bit to select the continuous ignition.
- Oil low press and ground information is used to avoid an unwanted anti ice fault on ground, engine not running (anti ice valve closed).
B. Interface with the Zone Controller
The configuration of the ANTI ICE pushbutton switch or position of the anti ice valve are used for computation of the air bleed status.
The configuration of the ANTI ICE pushbutton switch or position of the anti ice valve is used for computation of the air bleed status.
The configuration of the ANTI ICE pushbutton switch or position of the anti ice valve are used for computation of the air bleed status.
The configuration of the ANTI ICE pushbutton switch or position of the anti ice valve is used for computation of the air bleed status.
C. Interface with the System Data Acquisition Concentrator (SDAC)
A warning message is generated on the ECAM system in case of disagreement between anti ice valve control and position.
A warning message is generated on the ECAM system in case of disagreement between anti ice valve control and position.
A warning message is generated on the ECAM system in case of disagreement between anti ice valve control and position.
A warning message is generated on the ECAM system in case of disagreement between anti ice valve control and position.
6. Component Description
[4000DN]
The anti ice valve is a butterfly shutoff valve of the on/off type. The valve is spring-loaded to the closed position in the absence of motive pressure. A solenoid controls closure of the valve. The valve is fully open in the event of electrical signal loss and with sufficient motive pressure. The air bled from the ninth stage provides the motive pressure to the valve. The valve operates when the motive pressure is greater than 10 psi.
Upon energization of the solenoid, the valve closes.
The solenoid plunger retracts and causes:
De-energization of the solenoid opens the valve. The solenoid plunger extends under the action of the plunger spring. This drives the pilot ball against the motive pressure seat of the pilot and vents chamber A to ambient.
The motive pressure in chamber B acts on the piston to:
Insertion of the locking pin through the locking hole on the valve body into the mating hole in the piston locks the valve. A ball detent mechanism in the end of the locking pin retains the pin in the hole corresponding to the desired valve position.
A visual position indicator shows the position of the valve.
Two hermetically sealed switches actuated by a cam give the electrical position indication.
The cam is splined to the shaft of the actuator. The switches are capable of operation in a high temperature environment. The switches are configured to give a disagreement indication signal if the valve is not in the commanded position.
[4000DN]
The anti ice valve is a butterfly shutoff valve of the on/off type. The valve is spring-loaded to the closed position in the absence of motive pressure. A solenoid controls closure of the valve. The valve is fully open in the event of electrical signal loss and with sufficient motive pressure. The air bled from the ninth stage provides the motive pressure to the valve. The valve operates when the motive pressure is greater than 10 psi.
Upon energization of the solenoid, the valve closes.
The solenoid plunger retracts and causes:
De-energization of the solenoid opens the valve. The solenoid plunger extends under the action of the plunger spring. This drives the pilot ball against the motive pressure seat of the pilot and vents chamber A to ambient.
The motive pressure in chamber B acts on the piston to:
Insertion of the locking pin through the locking hole on the valve body into the mating hole in the piston locks the valve. A ball detent mechanism in the end of the locking pin retains the pin in the hole corresponding to the desired valve position.
A visual position indicator shows the position of the valve.
Two hermetically sealed switches actuated by a cam give the electrical position indication.
The cam is splined to the shaft of the actuator. The switches are capable of operation in a high temperature environment. The switches are configured to give a disagreement indication signal if the valve is not in the commanded position.
** ON A/C NOT FOR ALL [4000DN]
The anti ice valve is a butterfly shutoff valve of the on/off type. The valve is spring-loaded to the closed position in the absence of motive pressure. A solenoid controls closure of the valve. The valve is fully open in the event of electrical signal loss and with sufficient motive pressure. The air bled from the ninth stage provides the motive pressure to the valve. The valve operates when the motive pressure is greater than 10 psi.
Upon energization of the solenoid, the valve closes.
The solenoid plunger retracts and causes:
- the motive pressure to push the pilot ball against the pilot vent seat,
- the motive pressure to flow to chamber A.
De-energization of the solenoid opens the valve. The solenoid plunger extends under the action of the plunger spring. This drives the pilot ball against the motive pressure seat of the pilot and vents chamber A to ambient.
The motive pressure in chamber B acts on the piston to:
- overcome the spring,
- drive the valve to the fully open position.
Insertion of the locking pin through the locking hole on the valve body into the mating hole in the piston locks the valve. A ball detent mechanism in the end of the locking pin retains the pin in the hole corresponding to the desired valve position.
A visual position indicator shows the position of the valve.
Two hermetically sealed switches actuated by a cam give the electrical position indication.
The cam is splined to the shaft of the actuator. The switches are capable of operation in a high temperature environment. The switches are configured to give a disagreement indication signal if the valve is not in the commanded position.
[4000DN]
The anti ice valve is a butterfly shutoff valve of the on/off type. The valve is spring-loaded to the closed position in the absence of motive pressure. A solenoid controls closure of the valve. The valve is fully open in the event of electrical signal loss and with sufficient motive pressure. The air bled from the ninth stage provides the motive pressure to the valve. The valve operates when the motive pressure is greater than 10 psi.
Upon energization of the solenoid, the valve closes.
The solenoid plunger retracts and causes:
- the motive pressure to push the pilot ball against the pilot vent seat,
- the motive pressure to flow to chamber A.
De-energization of the solenoid opens the valve. The solenoid plunger extends under the action of the plunger spring. This drives the pilot ball against the motive pressure seat of the pilot and vents chamber A to ambient.
The motive pressure in chamber B acts on the piston to:
- overcome the spring,
- drive the valve to the fully open position.
Insertion of the locking pin through the locking hole on the valve body into the mating hole in the piston locks the valve. A ball detent mechanism in the end of the locking pin retains the pin in the hole corresponding to the desired valve position.
A visual position indicator shows the position of the valve.
Two hermetically sealed switches actuated by a cam give the electrical position indication.
The cam is splined to the shaft of the actuator. The switches are capable of operation in a high temperature environment. The switches are configured to give a disagreement indication signal if the valve is not in the commanded position.
7. Operation/Control and Indicating
A. General
The air bled from the fifth stage of the compressor passes through four duct sections and a line-mounted valve of the on-off type. At the forward bulkhead of the intake cowl, the anti ice system interfaces with the swirl nozzle in the intake lip. The spent air then enters the cavity of the intake cowl aft of the forward bulkhead: the air passes through holes in the inner cap of the bulkhead between the skin inner barrel and the bulkhead.
Finally, the air exhausts overboard through the flush duct in the outer barrel.
The airflow pressure is controlled by an anti ice valve which is of the butterfly type and electrically operated. The safety position of the valve is full open.
Q = airflow (kg/s).
When the anti ice valve is open, the information is fed to the zone controller. The latter determines the configuration of the engine bleed air to control the FADEC: this decreases the N1 limit relative to the ambient conditions, the engine operating conditions and the load of the anti ice bleed.
The air bled from the fifth stage of the compressor flows through four duct sections and a line-mounted, on-off type valve. At the forward bulkhead of the intake cowl, the anti-ice system has an interface with the swirl nozzle in the intake lip. The air used then goes into the cavity of the intake cowl aft of the forward bulkhead. The air goes through the holes in the inner cap of the bulkhead between the skin inner barrel and the bulkhead.
At the end the air is released overboard through the flush duct in the outer barrel.
A butterfly-type anti-ice valve that operates electrically, controls the airflow pressure. The safety position of the valve is the fully open position.
The air bled from the fifth stage of the compressor passes through four duct sections and a line-mounted valve of the on-off type. At the forward bulkhead of the intake cowl, the anti ice system interfaces with the swirl nozzle in the intake lip. The spent air then enters the cavity of the intake cowl aft of the forward bulkhead: the air passes through holes in the inner cap of the bulkhead between the skin inner barrel and the bulkhead.
Finally, the air exhausts overboard through the flush duct in the outer barrel.
The airflow pressure is controlled by an anti ice valve which is of the butterfly type and electrically operated. The safety position of the valve is full open.
Q = airflow (kg/s).
When the anti ice valve is open, the information is fed to the zone controller. The latter determines the configuration of the engine bleed air to control the FADEC: this decreases the N1 limit relative to the ambient conditions, the engine operating conditions and the load of the anti ice bleed.
The air bled from the fifth stage of the compressor flows through four duct sections and a line-mounted, on-off type valve. At the forward bulkhead of the intake cowl, the anti-ice system has an interface with the swirl nozzle in the intake lip. The air used then goes into the cavity of the intake cowl aft of the forward bulkhead. The air goes through the holes in the inner cap of the bulkhead between the skin inner barrel and the bulkhead.
At the end the air is released overboard through the flush duct in the outer barrel.
A butterfly-type anti-ice valve that operates electrically, controls the airflow pressure. The safety position of the valve is the fully open position.
B. Control and Indicating
Ice Protection of the Engine Air Intakes - Indications on Upper ECAM Display Unit ** ON A/C NOT FOR ALL
The control and indicating components are located on the overhead panel, on the ANTI ICE section of panel 25VU. Two pushbutton switches designated ENG 1 and ENG 2 are available, each associated with one engine.
Each pushbutton switch includes two luminous legends:
Ice Protection of the Engine Air Intakes - Indications on Upper ECAM Display Unit ** ON A/C NOT FOR ALL Each pushbutton switch includes two luminous legends:
- ON: blue,
- FAULT: amber.
(1) When you release the pushbutton switch, the ON legend is off and the system is not selected on.
(2) When you push the pushbutton switch, the ON legend is on and the system is selected on.
(3) Illumination of the FAULT legend indicates:
(a) With the ON legend off, the following failure:
- the anti ice valve is not fully closed.
It is necessary to push the ENG 1(2) pushbutton switch to extinguish the FAULT legend (the ON legend comes on).
(b) If the ON legend is on, the following failure:
- the anti ice valve is not fully open.
It is necessary to release the ENG 1(2) pushbutton switch to extinguish the FAULT legend (the ON legend goes off).
If failure of the anti ice valve is detected on the ground, it is possible to lock the valve butterfly in either the open or closed position for the next flight.
(4) The ENG ANTI ICE ON indication is displayed in green on the MEMO page on the lower part of the upper ECAM display unit if at least one of the two ice protection systems of the engine air intakes is selected on.
(5) Central warnings
Illumination of the FAULT legend of the ENG 1(2) pushbutton switch is accompanied by activation of the ECAM system:
Illumination of the FAULT legend of the ENG 1(2) pushbutton switch is accompanied by activation of the ECAM system:
- activation of the single chime,
- flashing of the amber MASTER CAUT light,
- warning display on the lower part of the upper ECAM display unit.
C. Anti-ice Valve Overpressure Indicator
(1) The Anti-ice Valve can be fitted with an Overpressure Indicator
(a) The anti-ice valve mechanical overpressure indicator has a release pressure that is set by the pressure reducer piston. When the pressure is between 120 psi (8.27 bar) and 180 psi (12.41 bar) the indicator will move to the extended position (pop out).
(b) When the overpressure indicator on the anti-ice valve is in the extended position there is a problem with the regulator in the valve or there is a problem with the overpressure indicator.
(c) The regulator in the valve is used to reduce the pressure inside the valve. When the pressure is reduced it extends the life of the seals of the actuator piston.
(d) Failure of the regulator to reduce the actuator pressure will shorten the life of the piston seals. If the seals are not good and the piston does not operate correctly it can possibly cause the valve to move to the closed position. If the valve moves to the closed position the air will not flow through the valve or the anti-ice system.