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MH-60R BONUS deck > AFCS (OFT 8) > Flashcards

AFCS (OFT 8) Flashcards

1
Q

What is the AFCS?

A
  • automatic flight control system
  • electrohydromechanical system
  • 3 subsystems: SAS, Stab System, AFCC
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2
Q

What is the AFCC?

A
  • commands SAS and trim actuators in C/P/R/Y channels
  • located in nose bay
  • 2 types of control: inner-loop and outer-loop
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3
Q

What is inner-loop control?

A
  • SAS actuators
  • fast control response
  • limited to 10% authority
  • does not move cockpit controls
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4
Q

What is outer-loop control?

A
  • trim actuators (or autopilot)
  • limited to 10% per second of rate response
  • has full authority (100%)
  • moves cockpit controls
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5
Q

What does the SAS do?

A
  • Senses rate acceleration in P/R/Y

- inputs rate dampening for improved stability

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6
Q

What is SAS 1?

A
  • analog

- P/R/Y only

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7
Q

What is SAS 2?

A

-digital

Same as SAS 1 but also has:

  • hover augmentarion
  • gust alleviation
  • altitude hold
  • coupler features
  • turn coordination
  • roll attitude hold
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8
Q

What kind of pressure and from what does SAS get px?

A
  • SAS actuators get hyd px from PAS module via SAS shutoff valve
  • controlled by SAS/BOOST pushbutton
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9
Q

When and why does the SAS caution illuminated?

A
  • during loss of px OR when actuators lose electrical power (manual disengagement or power server)
  • sensed by SAS px switch
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10
Q

With both SAS actualtors what is control authority?

A

-P/R/Y have +/- 10% authority

———–thats’s +/- 5% authority from each channel

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11
Q

What happens to control authority if either SAS fails?

What happens if SAS 1 fails?

What happens if SAS 2 fails?

A
  • AFCS DEGRADED caution and SAS on fail cube
  • remaining SAS works at +/- 5% control authority but at 2x the gain to compensate
  • if SAS 1 fails: AFCC automatically disengaged affected axis
  • if SAS 2 fails: pilot must manually disengage via AFCS panel
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12
Q

5 “Holds”

19 functions

A
  1. Attitude hold
  2. Airspeed hold
  3. Heading hold
  4. BARALT hold
  5. RADALT hold
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13
Q

5 “Hovers”

19 functions

A
  1. Auto approach
  2. Coupled hover
  3. Cable angle
  4. Crew
  5. Auto depart
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14
Q

3 “ations”

19 functions

A
  1. Turn coordination
  2. Hover augmentation and gust alleviation
  3. Stability augmentation (system)
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15
Q

Last 6

19 functions

A

MT DABS

  1. M = maneuvering stability
  2. T = trims
  3. D = diagnostic cubes
  4. A = auto pre-flight check
  5. B = blade fold assist
  6. S = stabiliator
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16
Q

Trim (19 functions)

A

-cyclic, collective, pedal

  • pitch and roll have hydraulic trim servos (1000psi)
  • collective and yaw have electric servos

-actuators command 100% control authority BUT are rate-limited to 10%/sec (outer-loop)

17
Q

How do you disengage yaw trim?

A

A/S < 50 KIAS = pedal microswitch

A/S > 50 KIAS = pedal microswitch AND cyclic trim release

17
Q

How do you disengage yaw trim?

A

A/S < 50 KIAS = pedal microswitch

A/S > 50 KIAS = pedal microswitch AND cyclic trim release

18
Q

Maneuvering stability

A

-engages by pushing AUTO PLT pushbutton on

-in AOB > 30°……..
longitudinal trim actuator pushes cyclic forward in a turn to “increase pilot effort” (i.e. false g-loading)

  • 1% of fwd cyclic per 1.5°AOB (between 30-70° AOB)
  • @ 70° AOB = 30% fwd cyclic
19
Q

Heading hold

Requirements, airspeed, re-engage

A
  • to turn on: weight OFF wheels and AUTO PLT on
  • disengaged with: WOW/on deck
  • A/S < 50 KIAS: 3°/second
  • A/S > 50 KIAS: 1°/click (less than a sec) OR 1°/sec
  • to re-engage HH after turn, 2 things must be maintained for 2 seconds:
    1. 2° of wings level
    2. Yaw rate < 2°/sec
20
Q

RADALT Hold

A
  • any airspeed and 0-5000’ AGL
  • RADALT, SAS 2, TRIM, AUTO PLT must be on
  • to change altitude, collective trim must be held until at new alt.
  • in hover coupler mode: altitude controlled with HVR ALT knob will be limited to 1000 fpm climb and 200 for descent (starts automatically within 2ft of selected altitude on HVR ALT)
21
Q

BARALT hold

A

-turned on when BAR ALT, SAS 2, TRIM, AUTO PLT are on

  • AFCC monitors engine Q and will stop collective increase if Q is pulled to:
  • —‐—-106% (> 80 KIAS)
  • ——–112% (< 80 KIAS)

-change altitude with collective trim release button (when depressed)

22
Q

Attitude hold

A
  • A/S < 50 KIAS and AUTO PLT engaged

- 4 way trim switch changes 5°/second

23
Q

Airspeed Hold

A

Engaged with:

  • AUTO PLT
  • A/S > 50 KIAS
  • AOB < 30°

-4 way teim switch controls at 6 KIAS/sec

24
Q

Pitch/roll hover augmentation and gust alleviation

A
  • controlled by SAS 2

- improved stability by maintaining attitude, lat/long acceleration to stop drift

25
Q

Turn coordination

A
  • allows pilot to fly coordinated turns with directional control from AFCS at > 50 KIAS
  • udes lateral acceleration and roll rate to determine if in balanced flight
  • done by yaw SAS and yaw TRIM
  • engaged when heading hold off, and roll attitude is > 1° AND any of the following:
  • ———–lateral cyclic > 3%
  • ———–cyclic trim release pressed
  • ———–roll attitude > 2.5° (using 4-way trim switch)
26
Q

Hover coupler

A
  • engaged after end of auto approach within 1kt of set airspeed OR manually within 5 kts
  • with SAS 2, TRIM, AUTO PLT, APPR/HVR
  • provides LAT/LONG groundswell control via LAT/LONG velocity potentiometers
  • AFCC monitors dual-engine Q to prevent collective increase if Q reaches 116%
  • warning, pay attention to airspeed, if you go above 50 KIAS you’ll be put on air speed hold
  • limitednto 50kts fwd, 20 kts aft, 20 kts sideways
  • cannot exceed 1000 fpm clim or 200 fpm descent
27
Q

Crew hover

A
  • allows aircrewman to contro/position hover when coupled
  • aircrww cyclic authority rated at +/- 5 KIAS
  • activatrd by CREW HVR pushbutton, but must be in coupled hover

MH-60R BONUS deck (26 decks)

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