W DOC AIRBUS | AMM A320F

ENGINE CONTROLLING COMPONENTS - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL
1. General
F Control Components
The engine controlling components contains the sub-systems that follows:
  • Fuel Metering Unit (FMU)
  • Split Control Unit (SCU)/Servo Valve Assembly (SVA)
  • T12 Sensor
  • T25 Sensor
  • T3 Sensor,
  • Fuel Temperature Transducer
  • Fuel Manifold Pressure Transducer
  • Rating Plug
  • Electronic Engine Control (EEC)
  • Permanent Magnet Alternator (PMA)
  • Functional interfaces
  • FADEC system.
** ON A/C NOT FOR ALL
2. System Description
A. Fuel Metering Unit (FMU)
F Fuel Metering Unit
The FMU converts the EEC channel in control electrical signals to hydraulic flows through an internal Electro-hydraulic Servo Valve (EHSV). The FMU contains an EEC controlled sub-system to give Thrust Control Malfunction Accommodation (TCMA).
The FMU is installed to the fan frame.
B. Split Control Unit (SCU)/Servo Valve Assembly (SVA)
F Split Control Unit
The SCU/SVA has two main functions:
  • To convert the EEC electrical signals to hydraulic flows
  • To give PMV feedback to both EECs.
The SCU/SVA is installed to the core case.
C. T12 Sensor
F T12 Sensor
The T12 sensor measures the total air temperature at the engine inlet.
The T12 sensor is installed in the flow path. It is installed on the air inlet duct, at 12 degree aft looking forward position, below a specific access door.
D. T25 Sensor
F T25 Sensor
The T25 sensor measures the total gas temperature at the inlet of the High Pressure Compressor (HPC).
The T25 sensor is installed in the primary flow path. It is installed on the fan hub, between 3 and 4 o' clock aft looking forward position.
E. T3 Sensor
F T3 Sensor
The main function of the T3 sensor is to give the temperature of the compressor discharge airflow to both EECs.
The T3 sensor is located on the Combustor Diffuser Nozzle (CDN) case.
F. Fuel Temperature Transducer
F Fuel Temperature Transducer
The main function of the fuel temperature transducer is to give fuel temperature signal information to both the EECs. The engine fuel temperature transducer is a dual channel Resistive Temperature Device (RTD). One output signal is routed to the EEC channel A and the second output signal to the EEC channel B.
The engine fuel temperature transducer is installed in a dry well fitting, which is part to the fuel line.
G. Fuel Manifold Pressure Transducer
F Fuel Manifold Pressure Transducer
The main function of the fuel manifold pressure transducer is to sense the pilot enriched manifold pressure at the exit of the SCU/SVA.
The fuel manifold pressure transducer is installed on the SCU/SVA and located on the engine.
H. Permanent Magnet Alternator (PMA)
F Permanent Magnet Alternator
The main function of the PMA is to give electrical power to each EEC.
The PMA stator is installed on the Accessory Gearbox (AGB).
I. Pressure Sub-System (PSS) Box and Sensor
F PSS Box and Sensor
The PSS has two main functions:
  • To perform signal conversions of the pressure system inputs and communicate with each EEC.
  • To provide Cross-Channel Data Link (CCDL) backup.
The PSS box and sensor is soft-mounted using vibration isolators on mounting brackets located on the fan case.
J. Rating Plug
F Rating Plug
The main function of the rating plug is to give the engine rating, thrust bump and N1 trim levels.
The rating plug is located on the PSS box.
K. Electronic Engine Control (EEC)
F Electronic Engine Control
The EEC has two main functions:
  • To process system input information and perform calculations and comparisons to stored memory information.
  • To adjust the fuel and air system to produce the thrust requested and engine airflow needed for cooling.
The EECs are soft-mounted using vibration isolators on mounting brackets located on the fan case. There are two identical EECs on each engine.
** ON A/C NOT FOR ALL
3. Reports Description
(Ref. AMM 31-37-73)
The reports that follow have a report description, report type, data usage and A/C frequency available. For the EEC reports mentioned below, 600 series reports are for engine 1 and 700 series reports are for engine 2.
NOTE: These engine reports can only be decoded by the engine manufacturer (CFM International). In order to obtain further information on the engine reports, please contact the CFM International.
The reports are available as follow:
  • 601 and 701, Supplemental Trend
  • 602 and 702, Post Flight Summary
  • 603 and 703, Bearing
  • 604 and 704, Fleeting Event
  • 605 and 705, Present Leg Fault
  • 606 and 706, Dispatch.
A. Supplemental Trend, 601 and 701
-------------------------------------------------------------------------------
| Report description | Report type | Data usage | A/C frequency |
-------------------------------------------------------------------------------
! Engine report that ! Trending report ! -Water wash ! 2/flight !
! collects data from ! ! counter combustor! (1/engine) !
! takeoff, climb and ! ! dynamics ! !
! cruise flight ! ! -Fuel system ! !
! phases, that are not! ! -Start system ! !
! transmitted by the ! ! ! !
! corresponding ! ! ! !
! aircraft generated ! ! ! !
! reports. ! ! ! !
-------------------------------------------------------------------------------

B. Post Flight Summary, 602 and 702
-------------------------------------------------------------------------------
| Report description | Report type | Data usage | A/C frequency |
-------------------------------------------------------------------------------
! Engine report that ! Trending report ! -Engine actuators ! 2/flight !
! collects data ! ! monitoring ! (1/engine) !
! throughout the ! ! -Internal EEC ! !
! flight from diverse ! ! temp. regulators ! !
! engine systems to ! ! -Sensor status ! !
! enable component ! ! monitoring ! !
! and sub-system ! ! -Oil consumption ! !
! health trending. ! ! -Vibe ! !
! ! ! -EEC software ! !
! ! ! monitoring ! !
! ! ! -Engine usage ! !
-------------------------------------------------------------------------------

C. Bearing, 603 and 703
-------------------------------------------------------------------------------
| Report description | Report type | Data usage | A/C frequency |
-------------------------------------------------------------------------------
! The bearing report ! Trending report ! Bearing ! 2/flight !
! contains engine ! ! diagnostics ! (1/engine) !
! vibration data to ! ! ! !
! support monitoring ! ! ! !
! of engine bearing ! ! ! !
! health. ! ! ! !
-------------------------------------------------------------------------------

D. Fleeting Event, 604 and 704
-------------------------------------------------------------------------------
| Report description | Report type | Data usage | A/C frequency |
-------------------------------------------------------------------------------
! The fleeting event ! Event report ! Vibe diagnostics ! 0-2/flight if !
! report captures ! ! ! event detected !
! dynamic data to ! ! ! !
! characterize ! ! ! !
! transient vibe ! ! ! !
! events identified ! ! ! !
! during a flight ! ! ! !
! to support ! ! ! !
! troubleshooting and ! ! ! !
! recommendations. ! ! ! !
-------------------------------------------------------------------------------

E. Present Leg Fault, 605 and 705
-------------------------------------------------------------------------------
| Report description | Report type | Data usage | A/C frequency |
-------------------------------------------------------------------------------
! Engine report that ! Event report ! Event ! 0-2/flight if !
! collects event data ! ! troubleshooting ! faults detected !
! throughout the ! ! ! !
! flight, long term ! ! ! !
! dispatch is also ! ! ! !
! included to monitor ! ! ! !
! failures and provide! ! ! !
! recommendations ! ! ! !
! prior major failures! ! ! !
! come up. ! ! ! !
-------------------------------------------------------------------------------

F. Dispatch, 606 and 706
-------------------------------------------------------------------------------
| Report description | Report type | Data usage | A/C frequency |
-------------------------------------------------------------------------------
! Engine report that ! Event report ! Event ! 1/event !
! collects data from ! ! troubleshooting ! (up to 6/engine)!
! short or no dispatch! ! ! !
! events to be ! ! ! !
! communicated real ! ! ! !
! time and analyzed ! ! ! !
! to provide ! ! ! !
! recommendations. ! ! ! !
-------------------------------------------------------------------------------

[Rev.10 from 2021] 2026.04.02 06:36:26 UTC
AVIA BRAIN PRODUCTION 2026