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Aircraft Systems > AS 08 - AN / APS 504 (V) 3 CT 142 Radar > Flashcards

AS 08 - AN / APS 504 (V) 3 CT 142 Radar Flashcards

1
Q

Review Questions

What are the distance rules for avoiding storm clouds?

A

5 NM below freezing level

10 NM above freezing level

20 NM when flying above 30 000’

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2
Q

Review Questions

What do scalloped or rapidly changing edges indicate on a weather radar return?

A

Developing storm, should be avoided by greater distances.

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3
Q

The ANAPS 504 Radar system is a multi-mode unit. What are it’s applciations?

A

SAR, surveillance, nav and WX detection.

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4
Q

What are the AN/APS 504 components?

A 
SPCU
Power Supply
Antenna
Waveguide Pressurization System
NTSC
LCD
ATS Controls
Receiver/ Transmitter
Pilot's Control Panel
RRIU
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5
Q

What is the Radar Hazard Area for exposed personnel and refueling vehicles, 360° around the AC, even in DUMMY Load?

A

100 ft

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6
Q

When does DUMMY Load have to be on at all times?

A

When the AC is on the ground.

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7
Q

Describe the Antenna component specs.

A

14x42’’ flat plate planar array
360° rotation capability
Manual tilt control of +/- 16°

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8
Q

Describe the Waveguide Pressurization System

A

Pressurizes the R/T and waveguide with nitrogen to prevent condensation and arcing at high altitude.
Located in the nose
System comprised of high-pressure nitrogen bottle, a large gauge and a regulator.

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9
Q

Radar Location & Power Supply

  • How many inverters provide power for the RADAR only?
  • Where is the radar power switch located?
  • What does the radar power switch allow?
A

There are three separate inverters for the radar located in the AC’s nose

The radar power switch is located on the co-pilot’s side console

The inverter power switch allows the three radar inverters to power up and supply the radar system with 115V AC

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10
Q

Describe the Radar/ Transmitter components

  • Explain the process
  • Frequency
  • Signal
A

The transmitter generates a RF signal and the receiver processes the returned RF signal for conversion to a video signal.
The R/T isolates and monitors faults and key radar parameters.
The transmitter frequency is 9310 to 3975 MHz
80 KW minimum peak signal, 100KW is typical
R/T is located in the nose

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11
Q

Pitch, roll and heading from IRU are sent to the antenna to ensure what?

A

The antenna rotational plane remains stationary with changes in AC attitude, up to 20° from horizontal (think a chicken’s head)

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12
Q

Describe the Navigation Training System Computer (NTSC)

A

The NTSC is the heart of the NTS, it interfaces with the radar via RRIU and it processes all video data

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13
Q

Describe the Remote Radar Interface Unit (RRIU)

  • Interfaces with
  • CDU and PCU significance
A

The RRIU interfaces with the ATS computer with the search radar via a full duplex RS-422 data link
This interface allows the radar to be controlled by operator inputs through emulated CDU
Also interfaces the radar with the PCU, allowing pilot-control of the radar when the NTS is not selected

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14
Q

Describe the Synchronizer Processor Converter Unit (SPCU)

  • Timing
  • Processing
  • Supplies
  • Receives
  • Circuitry
A

Provides overall radar system timing and control, video/signal processing and radar scan conversion.
Supplies the transmitter with command and control signals
Receives radar video inputs from the receiver
Contains control/ sync circuitry, video signal processing circuitry and scan converter circuitry

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15
Q

What does the Display provide?

A

High resolution, 3-colour Liquid Crystal Display (LCD) of enroute weather, ground mapping and navigation information within the antenna scan area.

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16
Q 
What does the Display receive from the:
R/T
Antenna
PCU
NTS
A

R/T: Video data & a trigger pulse
Antenna: Azimuth synchro data
PCU: Control signals
NTS: Emulated CDU

17
Q

What is the only control provided on the indicator?

A

Brightness

18
Q

What is the keypad and trackball used for on the display?

A

Used to input information into the computer

19
Q

Fun Fact:

Sliced bread was first manufactured by machine and sold in the 1920s by the Chillicothe Baking Company in Missouri.

A

Carry on with your studies soldier

20
Q

What does the Radar display present the user?

A

Scan return
AC’s True heading & local variation
Current time in UTC
Bearing from AC to cursor location & distance from the AC to the cursor location
The hook’s bearing in relation to the AC & hooks distance to the AC

21
Q

How many ranges are available for radar selection? What are they?

A

8 in total

All ranges in NM

3
6
12
25
50 NP
50 WP
100
200
22
Q

Which Range Selections have a narrow pulse and high PRF?

A

3, 6, 12, 25 and 50NM narrow pulse.

23
Q

Which Range Selections are wide pulse?

A

50 (WP), 100 and 200NM

24
Q

A low PRF and and wide pulse are better suited for what range?

A

Long range detection

25
Q

A high PRF and narrow pulse are better suited for what range targets?

A

Closer range

26
Q

True or false

The radar RPM is determined by range selection.

A

True

27
Q

Fill in the following Antenna RPMs for the corresponding Ranges
3NM to 50NM NP
50NM WP to 100NM
200NM

A

3NM to 50NM NP = 30 RPM
50NM WP to 100NM = 12 RPM
200NM = 7.5 RPM

28
Q

What do the following inputs provide/ allow/ receive?
IRU
Fix Button & Keyboard
NTS Computer

A

IRU: Provides heading, pitch, roll information for antenna stabilization (chicken head)
Fix Button & Keyboard: Allows inputs of target coordinates and altitude
NTS Computer: Receives video input from the radar

29
Q

WRT Outputs, control signals from the CDU go to the radar via the _____.

A

RRIU

30
Q

WRT Outputs, video display, radar range & mode and ____ ________ go to the LCD (operator display) via the what?

A

Fix information

Via the NTS computer

31
Q

WRT Outputs, cursor position goes to the DID via the what?

A

NTSC

32
Q

Fault Response - Radar Hot indicates what and require what steps to be taken?

A

Indicates the SPCU is overheating
Steps to be taken:
Radar system shut off via the radar power switch, located on co-pilots side panel
Open the computer cabinet and inspect for smoke or fire.

33
Q

Review Questions

What is the difference between 50NP and 50WP modes?

A

50NM NP - High PRF for target definition and good target detection at close range by providing more target returns per scan.

50NM WP - Low PRF keeps the average power high, provides the time needed to receive returns at longer ranges, improving long range target detection capabilities

34
Q

Review Questions

The Antenna is stabilized to what horizontal limits?

A

20° from the horizontal

35
Q

Review Questions

What does “HOT” indication mean when it is displayed in the Control area?

What should be done to prevent further damage to the system?

A

SPCU is over heating

Turn it off via the radar power switch
Inspect the computer cabinet and inspect for smoke or fire

Aircraft Systems (19 decks)

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