AFCS Functions Flashcards by Joseph Kuzmick

What does SAS do?

What is the difference between SAS 1 and 2?

What percent control do they have?

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%.

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

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

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

SAS 1

SAS 2 will be turned off by the AFCC.

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Which trim servos are electric?

Hydraulic?

Yaw, collective

Pitch, roll

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Trim is limited in movement by _________

10% percent per second

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To disengage yaw trim above 50 kias the pilot must _________

Below 50 kias?

Push the cyclic button and the trim micro switches

Just the pedal micro switches

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Auto pilot does what?

Maintains pitch and roll attitude, airspeed, heading during cruise

And

Provides a coordinated turn above 50 kias.

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

50 kias

5* per second

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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 ___________.

Above 50 KIAS and AOB less than 30*

6 KIAS per second

6* per second

Wings level

Accelerate through 50 kias

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

3* per second

1* per click or 1* per second

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

Roll attitude is within 2* of wings level

Yaw rate is less than 2* per second

Disengaged by WOW switch.

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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.

Collective SAS actuator and collective trim actuator

106%

120%

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Altitude that RADALT will work?

0 to 5000ft AGL.

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

SAS 2, TRIM, and AUTOPILOT

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RADALT climb and descent rates?

1000 ft per minute

200 ft per minute

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What does hover augmentation/gust alleviation do?

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

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

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

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

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

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

Automatic approach assumes _______ when engaged and again at ________.

Wings level

80 KIAS

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.

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

40KGS

TRIM REL

Automatic approach profile numbers?

ON (above 40KGS and below 40KGS)

Below-

Above-

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

What is the Warning associated with an automatic approach?

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

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 ________

+- 10

Within 2 ft and 1KGS
Or
5KGS

The hover coupler will stop increasing the _______ at ________.

Collective torque

116%

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

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

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

150ft and 120kias

Automatic depart assumes __________ at _______ if bank angle is ________. If bank angle is greater than ____. Automatic departure will limit power at __________.

Wings level attitude, 50KIAS Less than 5* 5* it will maintain a coordinated turn. 106 and 120% dependent on airspeed.

Automatic departure profile?

240ft/min climb 3kt/sec below 85 kts 1kt/sec above 100 kts

Crew hover control authority?

+- 5 KGS

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

9 seconds

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

2 degrees per tick 4. 25 degrees 8. 5 degrees

CABLE ANGLE AT LIMIT caution appears when ___.

cable angle has exceeded 7.5 degrees total deflection.

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?

27+- 12 ft water depth. Manually controlled Dipping operations.

What is required for Cable Angle Hover Mode?

KGS of +-5 Altitude hold w/in 10 ft. Dome wet indication.

The ______ are inoperative when CABLE ANGLE HOVER is engaged.

LONG VEL and LAT VEL potentiometers.

Cable angle takes ______ to come up with a solution.

25 seconds. Do not make inputs during this time.

Cable angle hover will not _________ with ____________ engaged.

Disengage Cable angle override on. (Must be manually disengaged)

To conduct AFCS preflight checks you need: WERBS

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

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

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

When does the SAS caution appear?

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

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

Outer-loop

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

Perpendicular

What does the SUBM OVRD button do?

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.)

How do you initiate the automatic preflight check?

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