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Aircraft Systems > AS 21 - ADM CADC Universal UNS 1C FMS > Flashcards

AS 21 - ADM CADC Universal UNS 1C FMS Flashcards

1
Q

Review Questions

What does the MEMORY light on the Doppler indicate?

A

A loss of valid returns on two or more beams

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2
Q

Review Questions

List the major components of the AHRS

A

Remote compass transmitter - Flux valve
AHRS control panel
AHRU

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3
Q

Define Static Pressure

A

The atmospheric pressure at the aircraft altitude unaffected by the motion of the aircraft

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4
Q

Actual static pressure depends on what?

A

Air temperature and density

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5
Q

Define Dynamic Pressure

A

The pressure which is due to the motion of the aircraft

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6
Q

Does Dynamic Pressure increase or decrease with air speed?

A

Increases

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7
Q

Pitot or total pressure (H) is a measure of what?

A

Static + Dynamic pressure

or

H = P + q

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8
Q

If an aircraft moves faster through the air what happens to the pitot pressure?

A

Pitot pressure increases

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9
Q

Dynamic pressure can also be expressed as?

A

q = H - P

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10
Q

What is the only output of a Pressure Sensitive Altimeter?

A

Static pressure

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11
Q

A Pressure Sensitive Altimeter displays an altitude that corresponds to what?

A

The sensed pressure in the ICAO standard atmosphere

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12
Q

A Pressure Sensitive Altimeter can correct for what? What can it not correct for?

A

It can correct for a pressure which is different from ISA

But not a temperature that differs from ISA

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13
Q

What are the errors for a Pressure Sensitive Altimeter?

A

Instrument Error
Position Error
Lag or Hysteresis
Temperature Error

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14
Q

Briefly describe the Instrument Error

A

Due to construction defects (friction)

Correction card carried

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15
Q

Briefly describe the Position Error

A

Caused by positioning of the static vent

Can be corrected by repositioning or a correction card

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16
Q

Briefly describe the Lag or Hysteresis Error

A

Mechanical lag between gears and capsules
Reads low on climbs and high on descent
Can be reduced by careful design

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17
Q

Briefly describe the Temperature Error

A

Largest error
Due to ICAO calibration
Rate of change of pressure with altitude depends on temperature
Corrected with Jeppesen computer

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18
Q

How does the Airspeed Indicator function?

A

Inputs the static and pitot pressure to find the differential pressure
The size of the capsule varies as the difference between the static and total pressure (differential pressure) varies

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19
Q

What are the DADC components?

A

2 pitot heads
2 static heads
2 temperature bulbs
2 Digital Air Data Computers (DADCs)

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20
Q

How is pitot pressure measured?

A

By placing a probe directly in the airflow around the aircraft

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21
Q

How does a static port work?

A

A plate with holes or slots sit perpendicular to the airflow
The slots lead to tube which are attached to instruments requiring static pressure
The pressure in the tubes is the static pressure at that altitude

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22
Q

How is temperature measured for the DADC?

A

A sensing device which is placed in the airstream
The thermometers contain temperature probes placed in temperature bulbs.
Each probe provides a resistance value equivalent to an OAT

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23
Q

What is true regarding the DADC temperature readings?

A

The sensors will always read a temperature which is higher than the actual OAT due to friction heating

24
Q

How can temperature readings be corrected in the DADC?

A

Automatically via the ADC

Mathematically using the Jeppesen

25
Q

What are the inputs for the DADC?

A

Pitot pressure
Static pressure
Temperature

26
Q

What are the outputs provided by the DADC?

A 
TAS
Pressure altitude
OAT
Maximum operating speed
Uncorrected pressure altitude (for the NTS only)
27
Q

Which DADC outputs are for the pilot/ co-pilot only?

A

TAS

Pressure altitude

28
Q

Define Indicated Airspeed

A

Airspeed shown on the ASI

29
Q

Define Calibrated Airspeed (CAS)

A

IAS corrected for instrument and position error

AKA Rectified Airspeed (RAS)

30
Q

Define Equivalent Airspeed (EAS)

A

CAS corrected for compressibility

Omitted below 250 kts IAS

31
Q

Define True Airspeed (TAS)

A

EAS corrected for pressure and temperature

32
Q

What does the memory aide ICE-T stand for?

A

IAS
CAS
EAS
TAS

33
Q

What are the Raw Data components received from the DADC inputs?

A

IAS
ALT
VSI

34
Q

Describe the Flight Management System

A

A fully integrated nav management system designed to provide the pilots with centralized control for the computer based flight planning and fuel management.

35
Q

What is the FMS capable of navigating along?

A

Pilot-programmed flight paths, including SIDs, airways, in-flight maneuvers, holding patterns, STARs, approached and runway data

36
Q

What are the UNS-1C (FMS) components?

A 
UNS-1C CDU x2 
Data Transfer Unit (DTU) x 1
Airdata Converter Unit x 2 
Glareshield advisories x 2 
GPS antennas x 2 
Config module
37
Q

How does the Kalman filter work for the FMS?

A

It blends the 2 GPS and IRU positions to derive the “best computed position”

38
Q

Describe RNAV

A

A method of navigation that permits aircraft operation on any desired course within the coverage of station-referenced nav signals or within the limits of a self-contained system capability, or both

39
Q

What are the advantages to RNAV?

A 
Nav does not need to be beacon to beacon
Can program routes into FMS
Conserves flight distance
Reduces congestion
Allows flights into airports without beacons
40
Q

Describe RNP

A

Required nav performance: A statement of navigation performance accuracy necessary for operation within a defined airspace

Arcs or fire

41
Q

What does the UNS-1C use from the IRS?

A

True headings which are then converted into a magnetic course which is displayed on the EHSI

42
Q

Where can the CT-142 not fly?

A

Latitudes above 73N

43
Q

Standard Jeppesen data includes what?

A

VORs, NDBs, enroute intersections, airports

44
Q

Extended Jeppesen data includes what?

A

SIDs, STARs, approach and runway info for selected airports

Extended database for all hard surface runways over 3 000 ft

45
Q

Regarding Receiver Autonomous Integrity Monitoring (RAIM):
4 satellites:
5 satellites:
6 satellites:

Provides what?

A

4 satellites: Provides 3-D position
5 satellites: RAIM
6 satellites: Fault detection exclusion (FDE) -> IDs and drops a bad satellite

46
Q

What is HIL?

A

Horizontal Integrity Limit (HIL) describes the size of error that the FDE can exclude

47
Q

HIL depends on what?

A

Depends on the number of satellites and the satellite geometry

48
Q

If the HIL is exceeded what happens?

A

GPS integrity warning is given

49
Q

RNAV approached require how many satellites?

A

5

50
Q

What does the Vertical Navigation function allows?

A

To define a desired vertical flight profile along the flight plan route.

51
Q

Review Questions

How do we measure static pressure?

A

Static port or vent

52
Q

Review Questions

What is the ideal orientation of the static sensor with regards to the airflow.

A

The vent should be positioned so that none of the airflow enters the holes

53
Q

Review Questions

How we we measure pitot or total pressure?

A

Pitot tube

54
Q

Review Questions

What is the ideal orientation of the sensor with regard to the airflow?

A

The tube should be oriented so that the maximum amount of the airflow due to aircraft motion enters the hole in the probe

55
Q

Review Questions

What are the components of the DADC?

A

2 pitot heads
2 static heads
2 temperature bulbs
2 Digital Air Data Computers (DADCs)

56
Q

Review Questions

What display instruments receive raw data?

A

IAS (PLT)
ALT (PLT SBY)
VSI (PLT)

Aircraft Systems (19 decks)

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