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Technical Paper

FADEC - Every Jet Engine Should Have One

1986-10-01
861802
The newest version of a jet engine fuel control is called a FADEC - Full Authority Digital Electronic Control. The original fuel controls on early jet engines of the late 1940's and early 1950's were simply constructed and resembled a common gate valve connected to a throttle lever, Engines and controls became more sophisticated thru the 1950's and 1960's, Better performance, more reliability, and increased safety became driving forces, the new electronic fuel controls will re even smarter, more precise, more accurate and more reliable than present day fuel controls and they will be with us for many years. ...This paper presents a short history of fuel controls, some of the objectives required for a successful FADEC system, a description of some of the hardware changes to meet these objectives, and an overview of some of the operational characteristics and system protection provided
Technical Paper

Full Authority Digital Electronic Control (FADEC) - Augmented Fighter Engine Demonstration

1982-02-01
821371
This paper describes continuing development of the Navy sponsored General Electric (GE) FADEC program as demonstrated by operation of a uniquely configured F404 advanced fighter engine. ...The General Electric FADEC, described in this paper, was programmed to operate with standard F404 control strategy and upon external command to shift to a strategy producing automatic control of a Variable Cycle Technology (VCT) feature, a Rear Variable Area Bypass Injector (RVABI). ...The General Electric FADEC, described in this paper, was programmed to operate with standard F404 control strategy and upon external command to shift to a strategy producing automatic control of a Variable Cycle Technology (VCT) feature, a Rear Variable Area Bypass Injector (RVABI). The FADEC microprocessor was also programmed to provide Failure Indication and Corrective Action (FICA) that utilizes a real time engine model to calculate and substitute replacement values (as required) for sensed values of fan speed, core speed, compressor discharge pressure, compressor inlet temperature, low-pressure turbine discharge temperature, and main engine fuel flow.
Standard

Guidelines for Time-Limited-Dispatch (TLD) Analysis for Electronic Engine Control Systems

2018-09-04
CURRENT
ARP5107C
This document includes the background of the development of TLD, the structure of TLD that was developed and implemented on present generation commercial transports, and the analysis methods used to validate the application of TLD on present day FADEC equipped aircraft. Although this document is specific to TLD analyses (for FADEC systems) of the loss of thrust control, the techniques and processes discussed in this document are considered applicable to other FADEC system failure effects or other systems, such as: thrust reverser, and propeller control systems, and overspeed protection systems. ...This SAE Aerospace Recommended Practice (ARP) provides methodologies and approaches which have been used for conducting and documenting the analyses associated with the application of Time Limited Dispatch (TLD) to the thrust control reliability of Full Authority Digital Engine Control (FADEC) systems. The TLD concept is one wherein a fault-tolerant system is allowed to operate for a predetermined length of time with faults present in the redundant elements of the system, before repairs are required. ...Although this document is specific to TLD analyses (for FADEC systems) of the loss of thrust control, the techniques and processes discussed in this document are considered applicable to other FADEC system failure effects or other systems, such as: thrust reverser, and propeller control systems, and overspeed protection systems.
Standard

Guidelines for the Integration of Electronic Engine Control Systems for Transport Category (Part 25) and General Aviation (Part 23) Aircraft

2024-01-16
CURRENT
AIR5924B
Since most current transport category engines use dual-channel FADEC systems, this is the configuration addressed by this report. A typical FADEC system configuration is shown in Figure 4. ...This SAE Aerospace Information Report (AIR) provides methodologies and approaches that have been used to install and integrate full-authority-digital-engine-control (FADEC) systems on transport category aircraft. Although most of the information provided is based on turbofan/turboprop engines installed on large commercial transports, many of the issues raised are equally applicable to corporate, general aviation, regional, and commuter aircraft, and to military installations, particularly when commercial aircraft are employed by military users.
Technical Paper

Full Authority Digital Electronic Control Turbofan Engine Demonstration

1980-09-01
801199
The success of the FADEC program to date has led to plans to flight test the FADEC in either an F-15 or F-14 aircraft in the early 1980's. ...This paper describes the design, demonstration and evaluation of a Full Authority Digital Electronic Control (FADEC) capable of controlling an advanced variable cycle gas turbine engine in an advanced supersonic Navy fighter aircraft application. ...This paper describes the design, demonstration and evaluation of a Full Authority Digital Electronic Control (FADEC) capable of controlling an advanced variable cycle gas turbine engine in an advanced supersonic Navy fighter aircraft application. The FADEC design incorporates many advanced technology features including the latest microelectronics, extensive fault tolerance capability, and high-speed digital communication using a fiber optic data link.
Technical Paper

Single Lever Power Management of Turboprop Engines

1991-09-01
912200
This was made possible by the use of a Full-Authority Digital Engine Control (FADEC). In order to maximize the use of the FADEC in the reduction of pilot workload, it is tied via various serial data busses on the aircraft to the Air Data Computer, the Autopilot, and Engine Indication and Crew Alerting System (EICAS). ...These inputs allow the FADEC to schedule torque linearly versus power lever command, and to hold each engine to within 1 percent torque of each other which prevents undesirable power lever splits or aircraft yaw. ...These inputs allow the FADEC to schedule torque linearly versus power lever command, and to hold each engine to within 1 percent torque of each other which prevents undesirable power lever splits or aircraft yaw. The FADEC also uses the Autopilot inputs to adjust engine power during approach to keep the aircraft on the specified glide slope.
Technical Paper

The PW2000: A Mature Engine with an Eye to the Future

1989-09-01
892365
A stiff centerline, erosion resistance of gas-path components, thermal resistance in the hot section, and FADEC control contribute to reliability and performance retention. Service experience demonstrates that the PW2000 has achieved early maturity.
Technical Paper

Pusher Turboprop Installation Technology for the Embraer CBA-123 Vector

1991-04-01
911030
It was the first Garrett turboprop to incorporate full authority digital electronic control (FADEC) and provide advanced component technologies to yield optimum powerplant efficiencies. A great deal of effort was expended on maintainability features including individual mechanical component accessibility and FADEC diagnostic capabilities. ...A great deal of effort was expended on maintainability features including individual mechanical component accessibility and FADEC diagnostic capabilities. Since each new aircraft powerplant installation requires special consideration of overall aircraft design goals and specific physical limitations, this paper discusses both the CBA-123 powerplant installation development as it relates to the pusher engine configuration and the engineering studies involved in meeting the basic design goals of the aircraft.
Technical Paper

Full Authority Digital Electronic Control of Pratt and Whitney 305 Turbofan Engine

1991-04-01
911018
Pratt and Whitney Canada has developed the PW305 turbofan engine equipped with a Full Authority Digital Electronic Control (FADEC) to meet these demands. The control system is designed to provide optimum engine operation within safe limits, reduced pilot workload and high reliability over the whole flight envelope.
Technical Paper

System Design - Key to Affordable Engine Fuel Systems

1994-10-01
942128
The development of large turbofans continues to dramatically increase the level of Full Authority Digital Engine Control (FADEC) system complexity, while at the same time demanding lower costs. Future complex systems will look to distributed architectures to overcome the difficulties imposed by highly centralized computing power.
Technical Paper

Engine Control, An Aircraft Atypical Computer: How to Set the Standard?

2011-10-18
2011-01-2543
This paper presents an Airframe Manufacturer view of one current working practices discussion relative to the FADEC electrical hardware change and describes an Airframe Manufacturer views on the committee's effectiveness along with a vision for its future. ...The Full Authority Digital Engine Control (FADEC) is more and more an atypical computer with a complexity similar to the computer systems used for flight control. ...The following paper describes the specific standard process to deploy to manage the electrical hardware FADEC changes over the life of the aircraft. The paper is the authoritative source for the abstract.
Technical Paper

Full Authority Digital Electronic Control Application to a Variable Cycle Engine

1980-09-01
801203
This paper describes the design, fabrication, and system bench testing of an advanced Full Authority Digital Electronic Control (FADEC) in preparation for full-scale testing on a variable cycle aircraft engine. This control provides all computation and signal-handling capability necessary for the advanced variable cycle engine control task, and is designed to meet challenging reliability, weight, envelope, and life cycle cost objectives.
Technical Paper

GCU for Megawatt Class Directed Energy Weapons Pulse Generators

2006-11-07
2006-01-3054
There are four entities that interact affecting the performance of the system: Controls: The generator regulator control loop Power Generation: The generator electromagnetic and mechanical properties Propulsion: The engine / FADEC transient performance characteristics Load: Load transients and feeder impedances Innovative Power Solutions and PC Krause and Associates under AF SBIR program conducted the investigation of different systems approaches to design a MW Digital Generator Control Unit (MDGCU) and selected the winning topology.
Technical Paper

Fuel Pump System Configuration for the More Electric Engine

2011-10-18
2011-01-2563
In the MEE gear pump system, the speed of which is controlled by an electric motor so that the pump discharges the exact fuel flow demanded by the FADEC (Full Authority Digital Electronic Control). When conventional AGB- and motor-driven gear pumps are compared in terms of power extraction from the engine, the latter takes less power than the AGB-driven pump because no bypass fuel flow is required.
Standard

Guidelines for Time-Limited-Dispatch (TLD) Analysis for Electronic Engine Control Systems

1997-06-01
HISTORICAL
ARP5107
This document includes the background of the development of TLD, the structure of TLD that was developed and implemented on present generation commercial transports, and the analysis methods used to validate the application of TLD on present day FADEC equipped aircraft. Although this document is specific to TLD analyses (for FADEC systems) of the loss of thrust control, the techniques and processes discussed in this document are considered applicable to other FADEC system failure effects or other redundant systems, such as, thrust reverser, and propeller control systems, and overspeed protection systems. ...This SAE Aerospace Recommended Practice (ARP) provides methodologies and approaches which have been used for conducting and documenting the analyses associated with the application of Time Limited Dispatch (TLD) to the thrust control reliability of Full Authority Digital Electronic Control (FADEC) systems. The TLD concept is one wherein a redundant system is allowed to operate for a predetermined length of time with faults present in the redundant elements of the system, before repairs are required. ...Although this document is specific to TLD analyses (for FADEC systems) of the loss of thrust control, the techniques and processes discussed in this document are considered applicable to other FADEC system failure effects or other redundant systems, such as, thrust reverser, and propeller control systems, and overspeed protection systems.
Standard

Guidelines for Time-Limited-Dispatch (TLD) Analysis for Electronic Engine Control Systems

2006-11-15
HISTORICAL
ARP5107B
This document includes the background of the development of TLD, the structure of TLD that was developed and implemented on present generation commercial transports, and the analysis methods used to validate the application of TLD on present day FADEC equipped aircraft. Although this document is specific to TLD analyses (for FADEC systems) of the loss of thrust control, the techniques and processes discussed in this document are considered applicable to other FADEC system failure effects or other systems, such as, thrust reverser, and propeller control systems, and overspeed protection systems. ...This SAE Aerospace Recommended Practice (ARP) provides methodologies and approaches which have been used for conducting and documenting the analyses associated with the application of Time Limited Dispatch (TLD) to the thrust control reliability of Full Authority Digital Electronic Control (FADEC) systems. The TLD concept is one wherein a redundant system is allowed to operate for a predetermined length of time with faults present in the redundant elements of the system, before repairs are required. ...Although this document is specific to TLD analyses (for FADEC systems) of the loss of thrust control, the techniques and processes discussed in this document are considered applicable to other FADEC system failure effects or other systems, such as, thrust reverser, and propeller control systems, and overspeed protection systems.
Standard

Guidelines for Time-Limited-Dispatch (TLD) Analysis for Electronic Engine Control Systems

2005-01-28
HISTORICAL
ARP5107A
This document includes the background of the development of TLD, the structure of TLD that was developed and implemented on present generation commercial transports, and the analysis methods used to validate the application of TLD on present day FADEC equipped aircraft. Although this document is specific to TLD analyses (for FADEC systems) of the loss of thrust control, the techniques and processes discussed in this document are considered applicable to other FADEC system failure effects or other systems, such as, thrust reverser, and propeller control systems, and overspeed protection systems. ...This SAE Aerospace Recommended Practice (ARP) provides methodologies and approaches which have been used for conducting and documenting the analyses associated with the application of Time Limited Dispatch (TLD) to the thrust control reliability of Full Authority Digital Electronic Control (FADEC) systems. The TLD concept is one wherein a redundant system is allowed to operate for a predetermined length of time with faults present in the redundant elements of the system, before repairs are required. ...Although this document is specific to TLD analyses (for FADEC systems) of the loss of thrust control, the techniques and processes discussed in this document are considered applicable to other FADEC system failure effects or other systems, such as, thrust reverser, and propeller control systems, and overspeed protection systems.
Standard

Guidelines for the Integration of Electronic Engine Control Systems with Transport Category Aircraft Systems

2004-02-12
HISTORICAL
AIR5924
Since most of today’s transport category engines use dual-channel full-authority digital engine control (FADEC) systems, this is the configuration which is primarily addressed. A typical FADEC system configuration is shown in Figure 2. ...This SAE Aerospace Information Report (AIR) provides methodologies and approaches that have been used to install and integrate full-authority-digital-engine-control (FADEC) systems on transport category aircraft. Although the information provided is based on turbofan engines installed on large commercial transports, many of the issues raised are equally applicable to corporate, general aviation, regional and commuter aircraft, and to military installations, particularly when commercial aircraft are employed by military users. ...Special considerations that pertain to single-channel FADEC systems or limited authority “supervisory” control systems are also addressed.
Technical Paper

Functional Safety (ASIL-D) for an Electro Mechanical Brake

2016-09-18
2016-01-1953
The ASIL-D brake electronics is currently implemented together with an electronics company that originated from safe aircraft electronics, e.g. gas turbine controllers (FADEC). The paper gives an overview of these topics, including details of the EMB control electronics, which is directly integrated into the brake.
Standard

Guidelines for the Integration of Electronic Engine Control Systems for Transport Category (Part 25) and General Aviation (Part 23) Aircraft

2013-01-16
HISTORICAL
AIR5924A
Since most of today’s transport category engines use dual-channel full-authority digital engine control (FADEC) systems, this is the configuration which is addressed. A typical FADEC system configuration is shown in Figure 2. ...This SAE Aerospace Information Report (AIR) provides methodologies and approaches that have been used to install and integrate full-authority-digital-engine-control (FADEC) systems on transport category aircraft. Although most of the information provided is based on turbofan engines installed on large commercial transports, many of the issues raised are equally applicable to corporate, general aviation, regional and commuter aircraft, and to military installations, particularly when commercial aircraft are employed by military users.
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