Flight Controls Flashcards
Where is the switch located to manually operate the stabilator or to reset the stabilator to the automatic mode from the manual?
Collective Flight control grip in each crew station
The stabilator position can be determined in the automatic mode by referring to what page on the MPD?
The ENG SYS page
The stabilator icon in the manual mode is displayed on what MPD page?
Man mode displayed on the FLT page
What symbol is placed above the stabilator icon on the FLT page if the MP and FMC cannot determine the position of the stabilator?
A question mark: (?)
What component allows the crewmember to manually adjust the collective friction?
The mechanical friction adjust
What are the five positions of the force trim switch located on the cyclic in each crew station?
Release (R), Attitude Mode (AT), Altitude Mode (AL), hold modes Disengage (D), and Center
The force trim may be selected on or off using what MPD page?
A/C UTIL
What component monitors the ARDD through the RVDT?
FMC
The FMC performs the monitoring and fault detection/fault isolation for what two systems?
Electronic flight controls and Stabilator
What is attitude hold designed to accomplish?
Maintain helicopter in a constant attitude
How do you recenter the SAS from the crew station?
Press and hold the force trim in the “R” position for 3 seconds
What are the 3 functions of the SCAS?
Stability augmentation, Command augmentation, and Hold
The BUCS is an emergency fly-by-wire backup control system that permits continued flight in the event of what two causes?
Jam or severance
What component provides the means to physically disconnect a flight control from its associated linkage?
Automatic Roller Detent Decoupler (ARDD)
What is the purpose of the LVDT?
Translate control motion into electrical signal
What three hydraulics have an impact on the hydraulic servos?
Primary, Utility, and Utility Accumulator
Failure of the primary hydraulic system will have what effect on the flight controls system?
Loss of FMC inputs SCAS( SAS, CAS, and BUCS)
What component implements PBIT, IBIT, and CBIT for the flight controls?
FMC
What two types of IBIT can be run on the flight controls?
Preflight and maintenance
What are the five BUCS FAIL cautions associated with the flight controls?
BUCS FAIL, BUCS FAIL P, BUCS FAIL R, BUCS FAIL Y, and BUCS FAIL C
Think PRYC (pronounced “prick”)
What is the difference between a flight control advisory audio for hold mode and hold mode failure?
None
SAS
Stability augmentation system - reduces crew workload by providing rate dampening in pitch, roll, and yaw
CAS
Command augmentation system - augments control inputs generated by the crew by increasing initial response rates in pitch roll and yaw to provide quickness of response without degrading SAS.
Manual stabilator mode cannot be used above what airspeed?
80 knots
How to reengage automatic stabilization operations?
Z-axis on the collective flight grip
At what airspeeds can hold modes be operated at?
Any airspeed
Which SCAS channel is disabled on the ground?
Yaw
Stabilator Man Mode
Manual mode failed stabilator position known
Stabilator position data not valid, position unknown
Stabilator position data not valid, TAS exceeds stabilator TAS limit
