AFCS Functions

Question 1

What does SAS do?

What is the difference between SAS 1 and 2?

What percent control do they have?

Answer 1

Senses acceleration and apples control to reduce the rate.

SAS 1 is Analog, SAS 2 is Digital. They are identical except for the hover aug/ gust alleviation and alt hold/ hover coupler provided by SAS 2.

They have 10% authority With each providing 5%.

Question 2

SAS 2 commands the collective inner-loop actuator by operating with ___________

Answer 2

RADALT, BARALT, APP/HVR and DEPART MODES ENGAGED.

Question 3

Which SAS must be manually disengaged by the pilot if it has failed?

Answer 3

SAS 1

SAS 2 will be turned off by the AFCC.

Question 4

Which trim servos are electric?

Hydraulic?

Answer 4

Yaw, collective

Pitch, roll

Question 5

Trim is limited in movement by _________

Answer 5

10% percent per second

Question 6

To disengage yaw trim above 50 kias the pilot must _________

Below 50 kias?

Answer 6

Push the cyclic button and the trim micro switches

Just the pedal micro switches

Question 7

Auto pilot does what?

Answer 7

Maintains pitch and roll attitude, airspeed, heading during cruise

And

Provides a coordinated turn above 50 kias.

Question 8

Attitude hold is engaged below _______, and using the 4-way trim switch will adjust pitch attitude at a rate of _________.

Answer 8

50 kias

5* per second

Question 9

Airspeed hold is engaged ___________. The 4-way trim switch will adjust the airspeed by ___________. The lateral trim roll rate is _________. It resets to __________ when you ___________.

Answer 9

Above 50 KIAS and AOB less than 30*

6 KIAS per second

6* per second

Wings level

Accelerate through 50 kias

Question 10

Heading hold is slewed at ____ below 50 kias and _______ above 50 kias.

Answer 10

3* per second

1* per click or 1* per second

Question 11

Heading hold is re-engaged when what 2 conditions are met?

Answer 11

Roll attitude is within 2* of wings level

Yaw rate is less than 2* per second

Disengaged by WOW switch.

Question 12

Altitude hold: The AFCC commands both the ____ and the ____ to maintain the reference altitude.

It will stop increasing power if torque hits _______ above 80 kias or ________ below 80 kias.

Answer 12

Collective SAS actuator and collective trim actuator

106%

120%

Question 13

Altitude that RADALT will work?

Answer 13

0 to 5000ft AGL.

Question 14

RADALT and BAR ALT require what push buttons to be engaged?

Answer 14

SAS 2, TRIM, and AUTOPILOT

Question 15

RADALT climb and descent rates?

Answer 15

1000 ft per minute

200 ft per minute

Question 16

What does hover augmentation/gust alleviation do?

Answer 16

Improves aircraft stability at low airspeeds by using attitude retention, longitudinal acceleration, and lateral acceleration to eliminate drift.

Question 17

Turn coordination is provided ______. It will engage when _________ and any of what 3 conditions exist?

Answer 17

Above 50 KIAS

Roll attitude is greater than 1*

And either:

1) lateral cyclic displacement is greater than 3%
2) Cyclic TRIM REL is pressed
3) roll attitude is more than 2.5* using 4-way trim

Question 18

The purpose of Maneuvering stability is to __________. It is provided by _________ between _______.

The ___________ push button must be engaged for it to function.

Answer 18

Increase pilot effort to maintain pitch rate at greater than 30* AOB

Pushing the cyclic forward by 1% for every 1.5* AOB. Between 30* and 75* AOB.

Autopilot

Question 19

Automatic approach assumes _______ when engaged and again at ________.

Answer 19

Wings level

80 KIAS

Question 20

The 4-way trim switch changes the deceleration rate by ________ during the automatic approach.

It will reset the deceleration profile at _____________. Pressing the ________ will reset the profile.

Answer 20

+- 1kt per second, 2 seconds for a full knot.

40KGS

TRIM REL

Question 21

Automatic approach profile numbers?

ON (above 40KGS and below 40KGS)

Below-

Above-

Answer 21

Above 40: 2.5kt/sec 215 ft/min

Below 40: 1.5kt/sec 130 ft/min

Below profile: 2.5 kt/sec w/RADALT hold

Above profile: 360 ft/min w/airspeed hold

Question 22

What is the Warning associated with an automatic approach?

Answer 22

If auto approach is turned on while in a trimmed turn it will spiral downward past the selected altitude and crash.

Question 23

Hover coupler speeds can be varied by ________ with the 4-way trim switch.

Hover coupler will automatically engage after an automatic approach when __________ and manually when within ________

Answer 23

+- 10

Within 2 ft and 1KGS
Or
5KGS

Question 24

The hover coupler will stop increasing the _______ at ________.

Answer 24

Collective torque

116%

Question 25

During couple hover if winds are greater than 50KIAS and the cyclic trim is depressed the ____________

Answer 25

Heading hold will be disabled. This could cause rapid deviation from the desired helicopter heading.

Question 26

Automatic depart, if not interrupted, will reach _____ and ______.

Answer 26

150ft and 120kias

Question 27

Automatic depart assumes __________ at _______ if bank angle is ________.

If bank angle is greater than ____.

Automatic departure will limit power at __________.

Answer 27

Wings level attitude, 50KIAS

Less than 5*

5* it will maintain a coordinated turn.

106 and 120% dependent on airspeed.

Question 28

Automatic departure profile?

Answer 28

240ft/min climb
3kt/sec below 85 kts

1kt/sec above 100 kts

Question 29

Crew hover control authority?

Answer 29

+- 5 KGS

Question 30

Cable angle is decoupled from the AFCS for ____ when dome raising/lowering is stopped or started in the water.

Answer 30

9 seconds

Question 31

Scale on the cable angle display is _________. The rings are at _____ and ______.

Answer 31

2 degrees per tick

4. 25 degrees
5. 5 degrees

Question 32

CABLE ANGLE AT LIMIT caution appears when ___.

Answer 32

cable angle has exceeded 7.5 degrees total deflection.

Question 33

The helicopter will default to HVR mode at _________ during cable angle hover.

If either axis is failed it must be _________.

What should you not continue if both axis are failed?

Answer 33

27+- 12 ft water depth.

Manually controlled

Dipping operations.

Question 34

What is required for Cable Angle Hover Mode?

Answer 34

KGS of +-5

Altitude hold w/in 10 ft.

Dome wet indication.

Question 35

The ______ are inoperative when CABLE ANGLE HOVER is engaged.

Answer 35

LONG VEL and LAT VEL potentiometers.

Question 36

Cable angle takes ______ to come up with a solution.

Answer 36

25 seconds. Do not make inputs during this time.

Question 37

Cable angle hover will not _________ with ____________ engaged.

Answer 37

Disengage

Cable angle override on. (Must be manually disengaged)

Question 38

To conduct AFCS preflight checks you need:

WERBS

Answer 38

WOW
Engine torque below 10%
Rotor brake ON
Both EGIs attitudes valid
SAS 1 ON (AFCC must be on for at least 20seconds)

Question 39

If one of the SAS channels fail, what is the operable control authority is the operable channel limited to?

Answer 39

+-5 percent authority, but it operates at twice the normal gain to compensate for the failed SAS channel

Question 40

When does the SAS caution appear?

Answer 40

Whenever SAS 1 and SAS 2 lose electrical power or when hyd pressure is lost to the actuators.

Question 41

Is Trim an outer-loop functions, or inner-loop?

Answer 41

Outer-loop

Question 42

Cable angle is used to keep the cable ____ to the water.

Answer 42

Perpendicular

Question 43

What does the SUBM OVRD button do?

Answer 43

Provides override capability of the 27+-12 ft submerge requirement to engage cable angle hover mode. (in case you’re dipping in shallow water or don’t have the dome wet indication.)

Question 44

How do you initiate the automatic preflight check?

Answer 44

by pressing the SAS 1 pushbutton. Takes approx 10 seconds to complete.