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MH-60R BONUS deck > AFCS Limits > Flashcards

AFCS Limits Flashcards

1
Q

What are the diagnostic cube functions?

A

-alert pilot to AFCS malfunctions/failures and to what part of AFCS

  • acknowledge = stop flashing = red circle button
  • clear = clear failure/warning = push cube in

-pushing cube is an alternate method to turn on SAS 2

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2
Q

All hover limits are what type of airspeed?

A

Groundspeed

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3
Q

4-way trim swictch: limits

A

-attitude (<50 KIAS) = pitch = 5°/second

  • airspeed (>50 KIAS & <30°AOB) =
  • ————————pitch= 6 KIAS/second
  • ——————–‐—roll = 6°/second
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4
Q

Heading hold: trim rocker limits

A
  • A/S <50 KIAS = 3°/second

- A/S >50 KIAS = 1°/second

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5
Q

Heading hold re-engages after what?

A

When BOTH occur together for 2 seconds:

  • wings within 2° of level
  • yaw rate <2°/second
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6
Q

What happens when you pass through 50 KIAS on auto departure

A

Wings automatically are leveled

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7
Q

What is required for heading hold to be activated?

A

Weight OFF wheels and AUTO PLT on

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8
Q

How do you change your heading hold?

A
  • A/S < 50 KIAS = pedal microswitches

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

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9
Q

What are the rate changes when you use the heading trim rocker?

A
  • A/S <50 KIAS = 3°/second

- A/S > 50 KIAS = 1°/single click OR 1°/second held

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10
Q

When does BARALT hold work?

A

Any airspeed, any altitude with SAS 2, TRIM, AUTO, and BARALT on

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11
Q

What is the short term sensor for thr BARALT?

A

Integrated vertical accelerometer

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12
Q

What is the long term sensor for the BARALT?

A

rate sensor

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13
Q

When does RADALT hold work?

A

0-5000’ AGL and any airspeed

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14
Q

How is the RADALT altitude changed at 200’ AGL or below?

A

Purple putch potentiometer

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15
Q

What is the recommended entry profile into an auto approach to hover?

A

150’/60 KIAS (ICW)

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16
Q

Auto approach to hover entry profiles

A
  • A/S > 40 KIAS ——> 215 fpm descent & 2.5kts/sec deceleration
  • A/S < 40 KIAS ——-> 130 fpm descent & 1.5kts/sec
  • ABOVE PROFILE –> 360 fpm descent
  • BELOW PROFILE—> RADALT hold and 2.5kts/sec. decel. until reaching profile
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17
Q

How do you change your accelerstion/deceleration rate during an auto approach to hover? How do you return to factory settings/parameters?

A

Use the 4-way trim switch to accel or decxel at 1kts/sec. To go back to standard rates, hit the cyclic release button

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18
Q

What’s a warning to consider when executing an auto approach to hover?

A

System assumes you are straight and level. If you have a turn trimmed in, you will death spiral. Requires pilot intervention to stop.

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19
Q

When does hover coupler mode engage at the end of an auto approach?

A

-automatically when within 1 kt of pre set airspeed

Or

-manually when within 5 kts

Or

RADALT hold engages within 2ft of thr altitude set on the potentiometer

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20
Q

What are climb and descent limits in hover coupler mode?

A

Cannot exceed >1000fpm climb or >200fpm descent

21
Q

What does the AFCC limit your torque to in hover coupler mode?

A

116%Q

22
Q

How can you manipulate speed and direction in a coupled hover?

A

4-way speed trim gives pilots +/- 10 kts in any direction

23
Q

Why do you need to pay attention to airspeed while moving in hover coupler mode?

A

You might exceed 50 KIAS because of wind and be kicked over to airspeed hold

24
Q

What profile does an auto departure take you to?

A

150’ AGL and 120 KIAS (aka transit airspeed between dip to dips)

25
Q

Rates of departure during an auto departure

A

-initially: climb at 240 fpm and accelerate rate at 3kts/second

  • @ 85-100kts = airspeed fade range
  • @ 50’ AGL = aircraft auto sets wings level if AOB<5°

-then: when greater than 100kts, acceleration slows to 1kt/second

-finish: 150’AGL/120KIAS UNLESS:
Cyclic trim release pushed = stops speed accel
Collective trim release pushed = stops climb

26
Q

What 4 things program the stabilator?

A

CLAP

C- collective position
L- lateral acceleration
A- airspeed
P- pitch rates

27
Q

Stabilator manual slew deegree/airspeed emergency limits

A 
0° = 150 KIAS
10° = 100 KIAS
20° = 80 KIAS
30° = 60 KIAS
40° = 45 KIAS
28
Q

What are your slewing limits when the stab fails?

A
  • full up = 30° slewing capability

- full down = 35° slewing capability

29
Q

What does gust alleviation do?

A

SAS takes input from winds and alleviates some control pressures and improves stability

30
Q

What is maneuvering stability

A

It is artificial G-loading.

Meaning the cyclic is displaced forward during high AOB turns

31
Q

What is the maneuvering stability rates?

A

1% forward cyclic for every 1.5° AOB increase between 30-75°AOB

At 75°AOB it will be 30% fwd cyclic

32
Q

What kind of trim controls are there?

A
  • cyclic
  • Collective
  • pedals
33
Q

How many trim servos are there?

A

4

  • 2 had boosted at 1000psi (pitch and roll)
  • 2 electric servos (Collective and yaw)
34
Q

What is SAS?

A

Stability augmentation system that senses rate acceleration in P/R/Y and inputs rate dampening for improved stability

35
Q

SAS 1 vs SAS 2

A

SAS 1 is analog and is P/R/Y only

SAS 2 is digital and has hover augmentatioj, gust alleviation, ALT hold and hover coupler, turn coordination, and roll ATT hold

36
Q

Inner loop vs outer loop AFCC control

A

Inner loop = SAS = fast rate response = limited to 10% authority = no cockpit control mvmt

Outer loop = autopilot = limited to 10% per second for rate response = full 100% authority = can move cockpit controls

37
Q

Auto prefligjt check requires what

A

Initiate by pushing SAS 1 after WERDS is met:

W- wow
E- engine Q < 10%
R- rotor brake on
D- dual EGI valid
S- SAS 1 on (after AFCC on for at leastn20 secs)
38
Q

Blade fold assist does what?

A

AFCC commands all trim actuators to out flight controls in correct position to facilitate blade fold,

then pitch-lock actuators engage,

then blade fold commences

39
Q

How long is the auto preflight check and what does it test?

A

It takes about 10 seconds. It tests the rate gyros are set, magnitude and polarity of their response is checked, and SAS 1analog is compared to SAS 2 digital readings

40
Q

What happens if a SAS fail?

A

If one fails, AFCS DEGRADED caution appears and SAS on diag cube, the other compensates by increasing twice the gain (still only 5% authority though)

If SAS 1 fails, pilot must manually disengage via AFCS panel

If SAS 2 fails, the AFCC automatically disengages affected axis

41
Q

Where do SAS actuators get their px from?

A

Hyd px from PAS module via SAS shutoff valve

42
Q

What is cable angle hover?

A

It is a hover used for dipping operations, it keeps the helicopter, cable, and sonar all in line/perpendicular

43
Q

Limits while towing a sonar array?

What is the definition of towing?

A 
Folded = 8KGS
Unfolded = 4 KGS

Towing is when the cable contacts the funnel

44
Q

How is cable angle engaged?

How is it disengaged?

A

Engaged by pressing CABLE ANGLE on SONAR CABLE ANGLE control panel

Automatically disengaged when dome is reeled up through 15-39ft water depth
OR
When pilot pushes CABLE ANGLE again

45
Q

What conditions are required for cable angle engagement?

A
  • in coupled hover
  • +/-5 KGS
  • ALT hold within 10 ft of selected altitude
  • dome wet indication
46
Q

What does the ALFS cable angle sensor measure?

A

They measure the angular displacement of the cable from the center of the funnel relative to aircraft orientation

While dome is submerged, it maintains perpendicular angle between cable and water (dead center on display)

47
Q

Cable angle display reference

A

Each tick = 2°
Inner ring = 4.25°
Outter ring = 8.5°

POCL = paid out cable length in ft = bottom left corner

Dipping depth = bottom right corner

TTR = time to reel

Ft in AGL = top right corner

48
Q

Warning/caution with cable angle dipping ops

CABLE ANGLE AT LIMIT alert

A

If the 8.5° outer ring is reached while the dome is leaving the water, there is a SIGNIFICANTLY INCREASED RISK of the dome sticking the aircraft including the aircraft rotor which may result in aircrewman injury and/or death.

If the 4.25° inner ring is exceeded as the dome ks leaving the water during raise operations, there an INCREASED RISK of the sonar dome sticking thr aircraft which may result in equipment damage

CABLE ANGLE LIMIT = potential cable damage and/or cable has exceeded 7.5°

49
Q

UTILITY HYD PUMP

UTILITY HYD PUMP HOT

UTILITY HYD RSVR LOW

A

UTILITY HYD PUMP CAUTION

Stop dome

MH-60R BONUS deck (26 decks)

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