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UH60 > Flight director > Flashcards

Flight director Flashcards

1
Q

Components of AFCS

A

SAS, Trim, FPS, Stab, FD

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2
Q

4 MMU function

A

Collective to pitch - Compensate for downwash on stab
Collective to roll - Compensate for translating tendency
Collective to yaw - compensate for torque effect
Yaw to pitch - Compensate for vertical thrust component of tail rotor

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3
Q

What does AFCS do

A

Enhances stability and handling of helicopter
Provides autopilot functions

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4
Q

What does SAS do

A

provides short term rate dampening in pitch, roll, yaw axes. Enhances turn coordination

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5
Q

What does trim do

A

Provides control positioning and force gradient functions as well as autopilot functions when used with FPS

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6
Q

What 9 functions does AFCS provide

A

Pitch, roll, yaw stability augmentation
Stab control
Cyclic, collective, pedal trim
Pitch and roll attitude hold
Heading hold
Pitch/roll hover augmentation and gust alleviation
Turn coordination
Fault detection/annunciations
Coupled FD integration

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7
Q

What does FLT DIR FAIL actually mean

A

One or more FD functions have disengaged.

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8
Q

What do FCCs do

A

They take signals from controls, motion sensors, control panels, and avionics to generate commands for the trim actuators, sas actuators, and STAB

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9
Q

Which system is inner loop, which is outer loop

A

SAS is inner loop
Trim is outer loop

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10
Q

What is trims authority and rate

A

100% authority over range of motion of controls, 10% per second

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11
Q

What is the authority SAS

A

10% max authority
(5% authority when SAS 1 or 2 is off - SAS DEGRADED)

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12
Q

Where do signals from FCC 1 and FCC 2 go

A

FCC 1 - SAS 1 actuators, No 1 STAB actuator
FCC 2 - SAS 2 actuators, no 2 STAB actuator, Trim

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13
Q

Define static stability

A

Tendency to return to pilots desired attitude or heading

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14
Q

Define dynamic stability

A

Tendency to resist movement (porpoising, rocking, fishtailing)

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15
Q

Describe the flow of input to output through AFCS

A

Input - Attitude/rate signals from EGIs, airspeed from ADC, position and accelerometer signals, stabilator position transmitter
Processor - FCCs
Output - Trim, SAS, stabilator actuators

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16
Q

How to the FCCs compare information

A

Cross channel data link

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17
Q

Describe the stab

A

Variable angle of incidence airfoil that enhances handling in the pitch axis

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18
Q

What range can the stab position indicator read between

A

-10 and 45

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19
Q

What can lead to limited auto mode (STAB DEGRADED)
How does it affect stab function

A

-1/2 signals lost from collective stick position, lateral accelerometers, or pitch rate data, or 1/2 actuators fail.
- half movement speed
-30 degrees total range of motion if STAB DEGRADE with stab full up
-35 degrees total range of motion if STAB DEGRADE with stab full down

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20
Q

What will cause STAB MANUAL MODE

A

-Any ADC airspeed sensor becomes invalid
-Miscompare of ADC airspeeds
-FCC failure (Only #2?)
-Stab actuator position becomes unknown
-Stab position transmitter fails

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21
Q

Stab functions

A

-Streamlines into rotor downwash at low speed
-Collective coupling - minimize pitch excursions from collective input starting at 30 knots
-Angle of incidence decreases with airspeed
-Lateral sideslip - Nose left (right slip) programs down (more rotor wash on advancing side)
- Pitch rate feedback - Hawks tail, dynamic movement to stabilize pitch attitude

22
Q

Attitude hold - When and what rate when thumbing TRIM switch

A

Engaged at all airspeeds
-5 degrees per second pitch, 6 degrees per second roll

23
Q

Heading hold - What airspeeds, what actuator is used, inner or outer loop?

A

Above 50 = heading hold/turn coordination
below 50 = heading hold
Yaw trim actuator
Outer loop

24
Q

When is heading hold disengaged and turn coordination engaged

A

-Trim beeper actuated in lateral direction
-Trim REL switch pressed and roll attitude > 2.5 degrees
-1/2 cyclic displacement with 1 degree roll attitude
-Using lateral AFCS beeper when not coupled to HDG (Standard rate turn)

25
Q

When is heading hold re-engaged following a turn

A

-Within 2 degrees of wings level
-With yaw rate less than 2 degrees per second.

26
Q

How to use heading hold below 50 knots

A

Engage both pedals, set heading, release
AFCS trim beeper

27
Q

When does heading hold engage in a hover

A

When yaw rate reaches 0, not when pedal switches are engaged.

28
Q

What is a standard rate turn?

A

3 degrees per second. 360 in 2 minutes

29
Q

How do you calculate standard rate turn?

A

15% of your true airspeed as bank angle.

100 knots = 15 degrees. 10% of airspeed, take half of that, add it.
120 knots. 10% = 12 + 6 = 18 degrees bank

30
Q

Warning:
-During moderately aggressive approaches, selection of the coupled FD (hover) can result in __________

-In DVE do not engage coupled FD (hover) unless ________

A

-unpredictable AC responses and excessive rates.
-Unless in a stabilized hover

31
Q

Caution:
During reduced vis at a hover, crew shall not __________

A

Shall not depend on coupled FD (hover modes) to recover aircraft in brownout/whiteout

32
Q

Caution: Beyond pitch attitudes of ________ coupled FD may not be able to recover AC to stabilized hover

A

25 degrees

33
Q

State “Logic for IAS mode” after a z axis plunge on cyclic trim beeper

A

60 to 80 - goes to 80
80 to 120 - goes to current airspeed (Dave nuance)
Above 120 - goes to 120

34
Q

What about using the coupled FD in ILS mode can overtorque the AC?

A

If lateral intercept angles are greater than 60 degrees, the glide slope may capture prematurely. If AC is below glide slope, the FD may greatly increase torque.

35
Q

There is no limiting in which axis of the coupled FD. What responsibility does this leave us?

A

Collective axis
Dont let mike overtorque

36
Q

Above what speed do coupled FD functions engage, below what speed do they disengage

A

50, 48

37
Q

Max rate of climb/descent in vertical speed?

A

2000fpm

38
Q

Radar altitude dial goes to _____ feet. Radar altitude digital readout goes up to

When descending from 2000ft, when would you see the digital readout for RALT reappear? How about the dial?

A

1050 feet (dial only reads to 1000)
1500 feet

1450
1000

39
Q

What does Go Around give us?

A

750fpm rate of climb
70 knots
wings level

40
Q

If you double tap go around on the cyclic, will it disengage?

What about on the FD?

A

No, cyclic has “engage only” function

Yes, you can double tap Go Around on the FD engaging, then disengaging it

41
Q

What happens if you Z axis plunge below 50 knots?

What happens if you Z axis plunge between 50 and 70 knots?

A

HVR Velocity

FD will capture and engage current airspeed

42
Q

What happens on the bottom of an ILS captued to ILS glide slope mode, if the pilot does nothing

A

Rides GS to 200’
ALVL (Auto level off) kicks in commanding a level off at 100’
Radar ALT comes on, captures at 50’ AGL

43
Q

What does ILS decel give us?

What conditions must be met to use ILS decel?

Can you adjust parameters of ILS decel?

A

slows to 70 knots by 200ft AGL

AC must be able to achieve 70 by 200 using a 0.5 knot per second DECEL. Aka you cant engage last second and woah boy it.

no

44
Q

What must be engaged prior to using ILS decel?

A

IAS, LOC, and GS modes must be engaged to use DECL, and must be far enough out to get 70 by 200’

45
Q

Max speed for IAS hold?

A

150?

46
Q

Hover decel
-How fast does it slow us
-When can I use it

A

-2.5 knots per second, beep forward for 1.5, back for 3.5
-Below 60 KIAS

47
Q

What do you get if you press TRIM REL during hover decel?

A

It will engage hover velocity hold with the present velocities fore/aft left/right

48
Q

When you are in velocity hold and press TRIM REL, what happens?

A

It temporarily suspends velocity hold. When you release trim, it will recapture velocity hold with the current velocities

49
Q

How fast can you go in hover velocity?

A

60 knots forward
20 knots aft left right

50
Q

What happens if you have a sick headwind, beep forward for 60 knots in Hover Velocity mode, but hit 60 KIAS at 40 ground speed?

A

FD will switch from hover velocity to IAS and capture at 60 KIAS

51
Q

When will Hover position mode automatically engage

A

When below 1 knot in either hover decel or hover velocity

UH60 (29 decks)

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