automatic flight control system (afcs)
DESCRIPTION
AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS). Presented by. PURPOSE: To develop the Student Instructor Pilot’s understanding of the Automatic Flight Control System NEED: You will be instructing this subject in the near future. TOPICS OF DISCUSSION. Auto Flight Control System - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/1.jpg)
AUTOMATIC FLIGHT CONTROL SYSTEM
(AFCS)
Presented by
![Page 2: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/2.jpg)
• PURPOSE: To develop the Student Instructor Pilot’s understanding of the Automatic Flight Control System
• NEED: You will be instructing this subject in the near future
![Page 3: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/3.jpg)
TOPICS OF DISCUSSION
• Auto Flight Control System • What is Stability?• Stability Augmentation System• TRIM• Flight Path Stabilization• Malfunction Analysis
![Page 4: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/4.jpg)
WHAT IS AFCS?
• AFCS enhances the stability and handling qualities of the UH60 helicopter. It is comprised of four subsystems:¤ Stability Augmentation System (SAS)¤ Trim Systems¤ Flight Path Stabilization (FPS)¤ Stabilator (previously discussed)
![Page 5: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/5.jpg)
WHAT IS STABILITY?
![Page 6: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/6.jpg)
• Stability, in physics and engineering, the property of a body that causes it to return to its original position or motion as a result of the action of the so-called restoring forces, or torques, once the body has been disturbed from a condition of equilibrium or steady motion.
![Page 7: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/7.jpg)
STABILITY AUGMENTATION SYSTEM (SAS)
• Purpose: Provide dynamic stability through short term rate dampening in the pitch, roll, and yaw axis.
• SAS systems: SAS 1 & SAS 2• Control Authority: Each SAS has 5%
control authority, for a total of 10%
![Page 8: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/8.jpg)
SAS 1• Components:
¤ SAS1 amplifier (analog) is located in the avionics compartment
¤ Three SAS actuators • Input Signals:
¤ Pitch - rate gyro in the #1 stabilator amplifier¤ Roll - pilot’s (number 2) vertical gyro¤ Yaw - yaw rate gyro in the SAS1 amplifier¤ additional signals - #1 filtered lateral
accelerometer, airspeed transducer
![Page 9: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/9.jpg)
#1 pitch rate gyro#2 vertical gyro
#1 lateral accla/s transducer
Yaw gyro
![Page 10: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/10.jpg)
SAS 2• Components:
¤ SAS2 is the SAS/FPS computer (digital)¤ Three SAS actuators
• Input Signals:¤ Pitch - rate gyro in the #2 stabilator amplifier¤ Roll - roll rate gyro in the avionics compartment¤ Yaw - yaw rate gyro in the avionics
compartment
![Page 11: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/11.jpg)
SAS 2
• Additional Signals ¤ #1 & #2 filtered lateral accelerometer ¤ rate gyro in the #1 Stabilator amplifier¤ air data transducer
![Page 12: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/12.jpg)
Roll rate gyro
#2 pitch rate gyro
Yaw rate gyro#1 & #2 lateral acclAir data transducer
![Page 13: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/13.jpg)
TRIM SYSTEM
• Purpose: Provide a gradient force, maintains position of the cyclic and tail rotor controls
• Components:¤ two electromechanical actuators, and one
electrohydromechanical actuator¤ TRIM REL switch on the cyclic, and pedal micro
switches on the directional control pedals¤ monitored by the SAS/FPS computer
![Page 14: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/14.jpg)
TRIM SYSTEM
• Slip Clutches¤ both the roll and yaw trim actuators
incorporate slip clutches to allow the pilots to make control inputs should either actuator jam
¤ 13 pounds maximum in the roll¤ 80 pounds maximum in the yaw
![Page 15: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/15.jpg)
Airspeed transducer
#1 collective position sensors
![Page 16: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/16.jpg)
FLIGHT PATH STABILIZATION
• Purpose: Enhances static stability through long term rate dampening in the pitch, roll, and yaw axis.
• Components: SAS/FPS computer, and three trim actuators
• Control Authority: When coupled with trim, 100% control authority
![Page 17: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/17.jpg)
FLIGHT PATH STABILIZATION
• The following systems must be on and operational for FPS to function 100%¤ SAS 1 and/or SAS 2¤ Boost¤ Trim¤ Stabilator in AUTO mode enhances FPS
operation, but is not required
![Page 18: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/18.jpg)
FLIGHT PATH STABILIZATION
FPS provides the following functions:
60 KIASBELOW ABOVE
Attitude Hold
Attitude Hold
Attitude Hold/Airspeed Hold
Attitude Hold
Heading Hold
Pitch Axis
Roll Axis
Yaw Axis Heading Hold orTurn Coordination
![Page 19: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/19.jpg)
Airspeed transducer
#1 collective position sensor
#1 pitch rate gyro#1 vertical gyro
#1 vertical gyro
ASN 43#1 lateral acclAirspeed transducer#1 collective position sensor
![Page 20: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/20.jpg)
MALFUNCTION ANALYSIS
![Page 21: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/21.jpg)
AUTO FLIGHT CONTROL
SAS 1 SAS 2 TRIM FPS
ON
BOOST FAILURE ADVISORY
ONRESET
POWER ON RESET
RESET
ON ON ON ON
![Page 22: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/22.jpg)
9.29.1 SAS Failure With No Failure/Advisory Indication.
SAS 1 switch - Off.
If condition persists:
SAS 1 switch - On.
SAS 2 switch - Off.If malfunction still persists:
SAS 1 and FPS switchs - Off.
![Page 23: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/23.jpg)
AUTO FLIGHT CONTROL
SAS 1 SAS 2 TRIM FPS
ON
BOOST FAILURE ADVISORY
ONRESET
POWER ON RESET
RESET
ON ON ON ON
SAS2
![Page 24: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/24.jpg)
Power On Reset switches - Simultaneously press and then release.
9.29.2 SAS2 Failure Advisory Light On.
![Page 25: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/25.jpg)
AUTO FLIGHT CONTROL
SAS 1 SAS 2 TRIM FPS
ON
BOOST FAILURE ADVISORY
ONRESET
POWER ON RESET
RESET
ON ON ON ON
SAS OFF
![Page 26: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/26.jpg)
9.29.3 SAS OFF Caution Light On.
FPS switch - Off.
![Page 27: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/27.jpg)
AUTO FLIGHT CONTROL
SAS 1 SAS 2 TRIM FPS
ON
BOOST FAILURE ADVISORY
ONRESET
POWER ON RESET
RESET
ON ON ON ON
SAS OFF
![Page 28: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/28.jpg)
AUTO FLIGHT CONTROL
SAS 1 SAS 2 TRIM FPS
ON
BOOST FAILURE ADVISORY
ONRESET
POWER ON RESET
RESET
ON ON ON ON
A /S
FLT PATH STAB
![Page 29: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/29.jpg)
9.29.4 FLT PATH STAB Caution Light On.
POWER ON RESET switches - Simultaneously press and then release.
WARNING
If the airspeed fault advisory light is illuminated, continued flight above 70 KIAS with the stabilator in the AUTO MODE is unsafe since a loss of the airspeed signal from the remaining airspeed sensor would result in the stabilator slewing full down.
![Page 30: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/30.jpg)
9.29.5 Pitch, Roll or Yaw/Trim Hardover.
POWER ON RESET switches - Simultaneously press and then release.
If failure returns, control affected axis manually.
![Page 31: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/31.jpg)
9.29.6 Trim Actuator Jammed.
LAND AS SOON AS PRACTICABLE.
![Page 32: AUTOMATIC FLIGHT CONTROL SYSTEM (AFCS)](https://reader033.vdocuments.net/reader033/viewer/2022061413/56815c2d550346895dca0917/html5/thumbnails/32.jpg)
QUESTIONS
?