DOC AIRBUS | AMM A320FHYDRAULIC FLUID TEMPERATURE INDICATING - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The temperature indicating system monitors the temperature of the hydraulic fluid in the three hydraulic systems. If the fluid temperature is too high, the indicating system data is used to generate warnings in the flight compartment.
** ON A/C NOT FOR ALL The temperature indicating system monitors the temperature of the hydraulic fluid in the three hydraulic systems. If the fluid temperature is too high, the indicating system data is used to generate warnings in the flight compartment.
2. Component Location
** ON A/C NOT FOR ALL 
Component Location| FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C ALL | |||||
| 1381GR | TEMP TRANSM SWITCH | 147 | 29-33-11 | ||
| 2381GR | TEMP TRANSM SWITCH | 197FB | 197 | 29-33-11 | |
| ** ON A/C NOT FOR ALL | |||||
| 3381GR | TEMP TRANSM SWITCH | 196BB | 196 | 29-33-11 | |
| ** ON A/C NOT FOR ALL | |||||
| 3381GR | TEMP TRANSM SWITCH | 196 | 29-33-11 | ||
3. System Description
The indicating system sends fluid temperature data to the electronic centralized aircraft monitor (ECAM). Discrete signals also make the FAULT light on the overhead panel come on.
The temperature of the hydraulic fluid is monitored at the outlet of the low pressure (LP) filter of each system. The LP filter is the last component in each system before the fluid returns to the reservoir of that system. A temperature transmitter is installed on the head of each system LP filter.
Each temperature transmitter sends analog signals to each system data acquisition concentrator (SDAC) (for ECAM) and a discrete signal to the SDAC and overhead panel (for FAULT light).
** ON A/C NOT FOR ALL The indicating system sends fluid temperature data to the electronic centralized aircraft monitor (ECAM). Discrete signals also make the FAULT light on the overhead panel come on.
The temperature of the hydraulic fluid is monitored at the outlet of the low pressure (LP) filter of each system. The LP filter is the last component in each system before the fluid returns to the reservoir of that system. A temperature transmitter is installed on the head of each system LP filter.
Each temperature transmitter sends analog signals to each system data acquisition concentrator (SDAC) (for ECAM) and a discrete signal to the SDAC and overhead panel (for FAULT light).
A. Temperature Transmitters (1381GR/2381GR/3381GR) FIN: 1381-GR FIN: 2381-GR FIN: 3381-GR
The three temperature transmitters are all the same and are interchangeable. Each temperature transmitter has three sensors together in one unit. The body of the temperature transmitter has an electrical connector and a bonding stud attached to it. The sensors are of two types:
The temperature switch is set to operate at 95 +-2.2 deg.C or -+2.2 deg.C (203.00 +-3.96 deg.F or -+3.96 deg.F) and to reset if the fluid temperature is equal to or less than 88.4 deg.C (191.12 deg.F).
The temperature transducers measure fluid temperatures between minus 55 deg.C (131.00 deg.F) and plus 120 deg.C (248.00 deg.F) with an accuracy of plus 2.2 deg.C (35.96 deg.F) and minus 2.2 deg.C (35.96 deg.F)
Each temperature transmitter has three sensors together in one unit. The body of the temperature transmitter has an electrical connector and a bonding stud attached to it. The sensors are of two types:
The temperature switch is set to operate at:
The temperature transducers measure fluid temperatures between:
The three temperature transmitters are all the same and are interchangeable. Each temperature transmitter has three sensors together in one unit. The body of the temperature transmitter has an electrical connector and a bonding stud attached to it. The sensors are of two types:
- a temperature switch which sends the discrete signal to the overhead panel and ECAM (through the SDAC)
- two temperature transducers which provide the analog signals for the two ECAM displays (via the SDAC).
The temperature switch is set to operate at 95 +-2.2 deg.C or -+2.2 deg.C (203.00 +-3.96 deg.F or -+3.96 deg.F) and to reset if the fluid temperature is equal to or less than 88.4 deg.C (191.12 deg.F).
The temperature transducers measure fluid temperatures between minus 55 deg.C (131.00 deg.F) and plus 120 deg.C (248.00 deg.F) with an accuracy of plus 2.2 deg.C (35.96 deg.F) and minus 2.2 deg.C (35.96 deg.F)
NOTE: Temperature transducers are used so that it will be possible (as an option) to show actual fluid temperature on the ECAM display as well as the warning which is shown at present.
Each temperature transmitter has three sensors together in one unit. The body of the temperature transmitter has an electrical connector and a bonding stud attached to it. The sensors are of two types:
- a temperature switch which sends the discrete signal to the overhead panel and ECAM (through the SDAC)
- two temperature transducers which provide the analog signals for the two ECAM displays (via the SDAC).
The temperature switch is set to operate at:
- 100 +-2.2 deg.C or -+2.2 deg.C (212.00 +-3.96 deg.F or -+3.96 deg.F) for 1381GR and 3381GR and to reset if the fluid temperature is equal to or less than 93.4 deg.C (200.12 deg.F)
- 95 +-2.2 deg.C or -+2.2 deg.C (203.00 +-3.96 deg.F or -+3.96 deg.F) for 2381GR and to reset if the fluid temperature is equal to or less than 88.4 deg.C (191.12 deg.F).
The temperature transducers measure fluid temperatures between:
- -55 deg.C (-67.00 deg.F) and +120 deg.C (248.00 deg.F) for 2381GR
- -51 deg.C (-59.80 deg.F) and +204 deg.C (399.20 deg.F) for 1381GR and 3381GR
with an accuracy of plus 2.2 deg.C (35.96 deg.F) and minus 2.2 deg.C (35.96 deg.F).
NOTE: Temperature transducers are used so that it will be possible (as an option) to show actual fluid temperature on the ECAM display as well as the warning which is shown at present.
5. Operation
The temperature transmitters monitor the temperature of the hydraulic fluid in the return line. When the temperature of the fluid gets to 92.8 deg.C (199.04 deg.F), the temperature transducers send an analog signal and the "OVHT" legend on the system display of the ECAM comes on in amber. When the temperature of the fluid goes higher than 95 +-2 deg.C or -+2 deg.C (203.00 +-3.60 deg.F or -+3.60 deg.F), the temperature switch in the transmitter closes. A discrete signal then goes to the overhead panel and through the SDAC to the Flight Warning Computer (FWC).
The warnings that follow then occur:
When the temperature of the fluid goes higher than:
The temperature transmitters monitor the temperature of the hydraulic fluid in the return line. When the temperature of the fluid gets to 92.8 deg.C (199.04 deg.F), the temperature transducers send an analog signal and the "OVHT" legend on the system display of the ECAM comes on in amber. When the temperature of the fluid goes higher than 95 +-2 deg.C or -+2 deg.C (203.00 +-3.60 deg.F or -+3.60 deg.F), the temperature switch in the transmitter closes. A discrete signal then goes to the overhead panel and through the SDAC to the Flight Warning Computer (FWC).
The warnings that follow then occur:
- The single-chime audio warning operates
- The MASTER CAUT lights on the glareshield come on
- The applicable FAULT light(s) come(s) on the overhead panel
- The applicable warnings are shown on the system and engine/warning displays of the ECAM.
When the temperature of the fluid goes higher than:
- 100 +-2.2 deg.C or -+2.2 deg.C (212.00 +-3.96 deg.F or -+3.96 deg.F) for 1381GR and 3381GR
- 95 +-2.2 deg.C or -+2.2 deg.C (203.00 +-3.96 deg.F or -+3.96 deg.F) for 2381GR
the temperature switch in the transmitter closes. A discrete signal then goes to the overhead panel and through the SDAC to the Flight Warning Computer (FWC).
The warnings that follow then occur: - The single-chime audio warning operates
- The MASTER CAUT lights on the glareshield come on
- The applicable FAULT light(s) come(s) on the overhead panel
- The applicable warnings are shown on the system and engine/warning displays of the ECAM.