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ATAV 602: Auto-flight Systems > Final Exam Review > Flashcards

Final Exam Review Flashcards

1
Q

Who is credited for creating the gyro and the inner feedback loop?

A

Elmer Sperry

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2
Q

Who is credited for helping design the first AP system?

A

Lawrence Sperry

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3
Q

What is the purpose of the AP system?

A

Reduce pilot workload so the pilot does not have to fly the plane manually

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4
Q

Know the boxes

A

DO IT

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5
Q

What is another Autopilot element that allows the assembly to remain parallel to the earth’s surface regardless of attitude?

A

Spinning gyroscope and its gimbals

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6
Q

In an EI pickoff, what is the output voltage from the secondary coil proportional to?

A

Displacement of elements away from Null position

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7
Q

In the EI Pickoff Output signal, what does the Null represent?

A

Reference Position

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8
Q

In the EI Pickoff Output signal, what does the Magnitude represent?

A

Angular deviation from null

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9
Q

In the EI Pickoff Output signal, what does the Relative phasing represent?

A

Direction away from null

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10
Q

In the EI Pickoff Output signal, what does the Rate of Change of Magnitude represent?

A

Angular velocity which the aircraft is changing course

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11
Q

The RLG senses what type of measurement?

A

Angular measurement

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12
Q

What is an RLG and how does it detect motion?

A

Ring Laser Gyro, detects motion using rate sensors

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13
Q

If the RLG is in phase, what does this mean and how are the lasers acting?

A

Level flight and light is intense

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14
Q

If the RLG is out of phase, what does this mean and how are the lasers acting?

A

Different frequencies, not on course and has a fringe pattern (dark bands)

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15
Q

What is MEMS?

A

MicroElectroMechanicalSystems used to make accelerometers

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16
Q

How does the MEMS work?

A

The position of the small cantilever beams = capacitance = accelerating force on the sensor

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17
Q

What do we use to measure angular rates and accelerations?

A

Inertial Reference Systems

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18
Q

What are the inputs of an IRU?

A

Initial position, latitude, and longitude

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19
Q

The IRU position gives us what?

A

aircraft location, direction of travel and other nav data

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20
Q

What are the inputs of an ADC?

A

pitot, static, and outside air temp (OAT)

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21
Q

Inputs of an ADC determine what?

A

ASI, VSI, ALT, SAT and TAT

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22
Q

ADC outputs a signal to what?

A

AP comouter and EFIS

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23
Q

What is the servo feedback proportional to?

A

Proportional to movement of control surface (servo, actuator, control surface)

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24
Q

What are the 2 types of feedback servos?

A

AC synchro and Differential transducers

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25
Q

What are the 2 types of AP systems?

A

Position (attitude) and Rate based

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26
Q

On what axis do we roll and which direction is a positive roll?

A

Longitudinal axis, nose to tail, roll right is positive

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27
Q

On what axis do we pitch and which direction is a positive pitch?

A

Lateral axis, wingtip to wingtip, pitching up is positive

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28
Q

On what axis do we yaw and which direction is a positive yaw?

A

vertical axis, yaw right is positive

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29
Q

What is the cause of adverse yaw?

A

Drag of a lowered AILERON during a turn

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30
Q

What is the affect of adverse yaw?

A

Causes nose of the aircraft to point away or, outwards, from the direction of turn

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31
Q

what is the unwanted yaw due to asymmetric thrust by the descending blade in a climb?

A

P factor

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32
Q

The vertical gyro output signal range for a roll is?

A

3mV/degree of roll

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33
Q

The vertical gyro output signal for a pitch is?

A

6mV/degree to 200mV/degree

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34
Q

What is the autoflight primary axis?

A

Roll axis

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35
Q

Single axis AP controls the what?

A

Ailerons

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36
Q

Know the HDG mode steps for Lateral mode operation

A
  1. The HDG bug is moved from 12 o’clock position on the HSI.
  2. A voltage µ error from that position is sent to the computer.
  3. The roll attitude signal is summed with the error signal, amplified and drives the servo to move the ailerons.
  4. Aircraft then rolls until the attitude signal is equal and cancels the HDG error signal.
  5. A standard rate turn is continued until within 25-30˚ of selected HDG and the resultant error is gradually reduced until the attitude signal begins to dominate.
  6. ØThe summed lateral circuits will now reduce the roll servo drive to reduce the bank angle until the aircraft has settled on the selected HDG.
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37
Q

What is the number/degree of a VOR/LOC mode intercept?

A

45degrees (FSD 150mV)

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38
Q

What does the Turn-Coordinator and Accelerometer give the aircraft?

A

Position and rate sensing

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39
Q

In a rate based AP system, what components are used for altitude control and pitch rate?

A

Accelerometers and static pressure sensor

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40
Q

What is the output between the supply voltage and ground that is proportional to the absolute pressure sensed at the static port?

A

Ratiometric signal

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41
Q

What is the purpose of the PITCH LIMITING FUNCTION on a Rate gyro vertical mode operation?

A

protect the airframe from excessive g forces/turbulence

42
Q

The pitch limiting function results in what?

A

Momentary disconnects from pitch/trim solenoids

43
Q

What are the 2 categories of FGS modes?

A

Lateral and Vertical

44
Q

Lateral modes control what?

A

Horizontal motion by rolling

45
Q

Vertical modes control what?

A

Vertical motion by pitching

46
Q

What are the 5 Lateral modes?

A

ROLL, APPR, GA, HDG, NAV

47
Q

What are the 7 Vertical modes?

A

PTCH, ALT HOLD, ALT SELECT, APPR, FLC, GA, VS

48
Q

The modes on the PFD are displayed on what?

A

Flight Mode Annunciator (FMA)

49
Q

What is the function of the flight director?

A

To present steering instructions on the PFD

50
Q

The selection and indication of the FD modes is a function of?

A

Mode Logic

51
Q

Mode logic and control laws are _______ that control the flight control systems

A

Software

52
Q

What are the subsystems of a FGS?

A

FD, AP, AT

53
Q

Computing FG steering commands is done by what?

A

Flight Control Laws

54
Q

Controlling FD and AP is done by what?

A

Discrete logic and hardware

55
Q

The correct selected and indicates modes on the FGS are based on what?

A

Selected = Input

Indicated = output

56
Q

When turning on FGS, what modes are on by default?

A

Roll and Pitch

57
Q

Control Systems can be classified as either?

A

Closed or Open loop

58
Q

What is the purpose of the error signal?

A

Issues a correcting order that changes existing conditons to desired conditions

59
Q

How do we eliminate overshooting?

A

Damping by introducing a voltage in opposition to signal voltage
Physical restraint on servo output

60
Q

What type of servos do we use on Transport category aircraft and how does it work?

A

Hydraulic servos, works using a transfer valve and an LVDT feedback

61
Q

Why is the Dutch Roll only dampened and not eliminated?

A

The signal to control it must come from the Dutch roll itself

62
Q

In a rate gyro Dutch roll signal, when does the phase of the gyro signal reverse?

A

When direction of turn changes

63
Q

What do the control laws do?

A

Prevent the aircraft from going into dangerous positions of flight

64
Q

What is the B787 Autoflight system comprised of?

A

Autoflight Function

Thrust Management

Flight Management

65
Q

In the B787, the AF system is capable of what phases of flight?

A

all

66
Q

When the flight crew needs to input data into the FMS, how do they do that?

A

using the CCD and MFK which goes into the CDU

67
Q

What are the flight crew entries?

A

Cost index

Cruise Altitude

Airplane gross weight

68
Q

What are the preflight introduction pages?

A

IDENT

POS INIT

RTE

DEP/ARR

PERF INIT

THUST LIM

TAKEOFF REF

69
Q

This page in the preflight intro is used to verify the FMF operational program and data base info

A

IDENT

70
Q

This page in the preflight intro is used to set the reference airplane initial position

A

POS INIT

71
Q

This page in the preflight intro is used to generate a flight plan or set a company route from the nav data base

A

RTE

72
Q

This page in the preflight intro is used to select departe runway and standard instrument departure (SID) data. Destination and approach also selected here

A

DEP/ARR

73
Q

This page in the preflight intro is used to enter aircraft and atmospheric data that is necessary for the FMF to calculate the flight vertical profile performance data

A

PERF INIT

74
Q

This page in the preflight intro is used to select the engine thrust limits for the thrust TMF

A

THRUST LIM

75
Q

This page in the preflight intro is used to select takeoff flap, cofg and takeoff V speeds

A

TAKEOFF REF

76
Q

What is the purpose of the TMF?

A

controls engine thrust levers from takeoff to touchdown, gives max fuel conservation

77
Q

How are the thrust levers moved by the TMF?

A

2 independent servo motors

78
Q

What TMF controls are available in the flight compartment?

A

Arm switch on MCP,

TO/GA or thrust lever,

Disconnect on thrust lever,

Mode select (thrust or speed) on MCP

79
Q

Which function is used to calculate the thurst control settings?

A

FMF

80
Q

What are normal AF modes in cruise?

A

LNAV and VNAV

81
Q

How would the pilot initiate take off and what modes are on?

A

AT armed, then TOGA switch

FD and AT

82
Q

Study this diagram

A

Study it

83
Q

Study this diagram

A

Study it

84
Q

The thrust management system indications show on which displays?

A

PFD, HUD, EICAS

85
Q

During a ground inspection external check, what are you checking for?

A
  1. Control surfaces for looseness, bushings tight
  2. NO movement on hor/vert stabilizers
  3. trim tabs for unusal placement/settings
  4. pitot and static ports for debris and deformations
86
Q

On a turn coordinator/rate based AP where should the flag be when the gauge is powered?

A

Out of view

87
Q

When performing an AP ground test, when youn turn on the AP what are the default modes?

A

HDG hold and Attitude hold

88
Q

During a trim operation ground test, the autotrim will trim in which direction if the yoke is applying a downward pressure?

A

Opposite, it will trim up

89
Q

After monitoring the heading for long term drift, adjust the roll null trim pot for ________ heading change

A

minimum

90
Q

When overpowering the roll clutch, what will you do and what are you checking?

A

forcing the aircraft into a 30degree bank and seeing if the clutch can bring the aircraft back to level flight

91
Q

After repeating the overpowering procedure, if there is a difference in performance in the clutch, what is the issue?

A

P factor and weak clutch

92
Q

An AP response after pitching the nose 5-7degrees must be damped such that the aircraft returns to level attitude within _______ cycle in converging manner

A

ONE CYCLE

93
Q

How many degrees must you adjust the HDG bug of the current HDG to check roll gain?

A

10 degrees

94
Q

The difference betwen the left and right turn bank angles should not be more than what? If the tolerance is exceeded what is at fault?

A

+-2degrees, gyro at fault

95
Q

The forces needed to move the control yoke through its neutral position and the rudder pedals from their center position describes what?

A

Cable Friction

96
Q

An oscillation lasting roughly one second is caused by what?

A

AP malfunction or cable friction too low

97
Q

An AP malfunction or cable friction that is too high can cause what?

A

10-30s oscillations

98
Q

The key to knowing there is a GAIN problem is that the oscillations are what?

A

periodic

99
Q

Which function has vertical and lateral guidance for all phases of flight except the takeoff roll and final approach and touchdown?

A

FMF

100
Q

The FMF autotunes which nav radios?

A

DME, VOR, ILS, GPS/GLS

ATAV 602: Auto-flight Systems (10 decks)

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