AFCS Flashcards
AFCS is comprised of how many systems, and what are they?
5
SAS, Trim, FPS, Flight Director, Stabilator system
What is the Inner loop?
(SAS) is fast in response
What is the outer loop?
(Trim/FPS) responds slower, driving flight controls
Where are the stab amps now?
In the no. 1 and 2 FCCs
Where are the FCCs located?
No 1 in the transition avionics compartment. No 2 in the nose compartment.
AFCS: How many accelerometers are there?
2 lateral, 2 longitudinal, 1 vertical
Are the trim actuators interchangeable?
No, they have different slip clutches.
Stabilator: What does the limit switches do?
Prevent the stabilator from making contact with the fuselage.
how many Air Data Computers (ADCs) do we have in the aircraft?
3
What does lateral movement of the collective trim beeper do, below 50 knots?
The helicopter will do a pedal turn
What does lateral movement of the collective trim beeper do, above 50 knots?
The helicopter will do a standard rate turn
What “axis” do trim work in?
Collective, pitch, roll , yaw
What “axis” do SAS work in?
Pitch, roll, yaw
What component senses the aircrafts veritical acceleration?
The vertical accelerometer
How can you get a SAS DEGRADED advisory?
turn off on of the SAS switches, or if the SAS computer detects a fault within the system.
How can you get a SAS OFF caution?
Turn off both SAS or if you lose pressure at the SAS actuators.
Can you get a TRIM FAIL caution on its own?
No.
What is the force required to break through the clutch for the collective?
22 pounds
What is the force required to break through the clutch for yaw?
80 pounds
What is the force required to break through the clutch for roll?
13 pounds
Can FPS move the collective trim?
No, only the Flight Director can move the yaw.
What can the Flight Director move?
Collective, pitch and roll.
Can you get both the FLT DIR FAIL and the FD COUPLE FAIL lights at the same time?
Yes
On the UH60M, AFCS __________ have been replaced with _______________.
Rate Gyros, EGIs, lateral, longitudinal and vertical accelerometers.
The FCCs, through FCC 2, provide FPS command signals to the pitch, roll and yaw trim actuators which in turn reposition the flight controls for __________ & __________ attitude hold and also ________ hold in yaw.
Pitch, roll, heading
The stabilator system utilizes airspeed signals that originates from where?
ADCs (Air Data Computers)
The stabilator system utilizes pitch rate signals that originate from where?
EGIs
What provides a visual Vne indication?
Vne red arc
The stabilator test can only be performed when the helicopter is??
On the ground with Nr
What results in a STAB MANUAL MODE caution?
An ADC miscompare or loss of the airspeed signal.
What results in STAB DEGRADED?
Loss of CLP from CLAP.
