ESWS Combat Systems > Sonar > Flashcards

Sonar Flashcards

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1
Q

What does SONAR stand for?

A

Sound Navigation and Ranging

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2
Q

What is the primary purpose of SONAR?

A

To locate, classify, track and if necessary engage underwater contacts

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3
Q

What is the nomenclature of the SONAR suite mentioned?

A

A(V)15

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4
Q

What types of SONAR does the A(V)15 process?

A

Active and passive sonar

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5
Q

Name the sub-systems of the A(V)15 SONAR suite.

A
  • SQS-53C Hull Mounted Array
  • MFTA (Multi-Function Towed Array)
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6
Q

What factors affect sound in the water?

A
  • Temperature
  • Salinity
  • Pressure
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7
Q

What is XBT?

A

Expendable Bathy Thermograph

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8
Q

What is active SONAR?

A

Controlled output of sound into the water with acoustic return processing

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9
Q

What is passive SONAR?

A

Listening for sounds emitted by other sources

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10
Q

What is passive broadband in SONAR?

A

Noise down a line of bearing

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11
Q

What is passive narrowband in SONAR?

A

A contact’s specific frequency signature

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12
Q

What is an advantage of active SONAR?

A

Gives bearing, range, course and speed

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13
Q

What is a disadvantage of active SONAR?

A

Overt, gives away ship’s position

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14
Q

What is an advantage of passive SONAR?

A

Covert, quiet and we can go unseen

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15
Q

What is a disadvantage of passive SONAR?

A

Can’t get specific contact classification

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16
Q

What is the SQS-53C?

A

A cylindrical array with passive and active capabilities

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17
Q

What material is the SQS-53C dome made of?

A

Rubber made by BF Goodrich

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18
Q

How many transducers does the SQS-53C have?

A

576 transducers

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19
Q

What is the pressurization level of the SQS-53C?

A

Pressurized to 39.5 (+2-0) psi

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20
Q

What is the SQS-53C filled with?

A

Fresh water, pressurized by fire main

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21
Q

What happens to the dome during dry dock?

A

The dome goes on air

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22
Q

What is the dome alarm procedure?

A

Slow the ship to 5 knots

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23
Q

What is the length of the MFTA?

A

610 ft

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24
Q

How many modules does the MFTA have?

A

7 modules

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25
What is the length of the deployable cable for the MFTA?
5200 ft
26
What material is used to fill the MFTA cable for buoyancy?
ISOPAR-M
27
What is the purpose of the 200ft drogue in the MFTA?
To stabilize the array and reduce vibration
28
What is the maximum tow speed for the MFTA?
18 kts
29
While deployed, what is the maximum angle of rudder allowed for the MFTA?
15 degrees
30
What is the maximum course change allowed for the MFTA?
180 degrees
31
What should be maintained while towing the MFTA?
Forward motion, never back down
32
What does UB stand for in Fire Control?
Underwater Battery
33
What is the responsibility of the watch stander operating the UB?
Engaging hostile underwater contacts
34
Name two types of torpedoes mentioned.
* MK46 * MK54
35
What color is the OTTO II fuel used for torpedoes?
Orange
36
What does the OTTO II fuel smell like?
Burnt almonds
37
What type of fires does OTTO II create?
Class D fires
38
What is the firing pressure minimum for torpedoes?
1600 psi
39
What is the train angle for the torpedo tubes?
45 degrees
40
How many tubes are there per mount for the MK32 MOD15 SVTT?
3 tubes
41
What are the three weapons postures?
* WP1 - Torps in tubes, tubes trained out, air flasks charged * WP2 - Torps in tubes, tubes not trained out, air flasks not charged * WP3 - No torps in tubes, tubes not trained, air flasks not charged
42
What does MK41 MOD 7 VLS stand for?
Vertical Launching System
43
What does the VLA in MK41 MOD 7 VLS stand for?
Vertical Launch ASROC
44
What is the range of the VLA?
3-18 KYDS
45
What is the booster drop zone distance for safety of other surface ships?
2.5-5 KYDS
46
Where can you fire the SVTT?
UCFS, TSP, Locally on the tubes
47
What is the designation of the helicopter mentioned?
Lamps MK III Helo
48
What is the AN/SRQ-4 used for?
HAWKLINK
49
What type of radar is the AN/ALQ-210?
ESM RADAR
50
What does AN/AAS-44 FLIR stand for?
Forward Looking Infrared
51
How many sonobuoys can be carried?
25 Sonobuoys
52
What is the capability of the AN/AQS-22 Dipping Sonar?
Active capable
53
What is the purpose of the Acoustic Device Countermeasure (ADC)?
Distract torpedoes
54
How are ADC deployed?
From bridge wing during evasive maneuvers
55
What is the designation of the towed body countermeasure system?
SLQ-25C - NIXIE
56
What is the length of the cable used in NIXIE?
2100 ft
57
How much of the cable in NIXIE is deployable?
2000 ft
58
What is the total cable length of MFTA?
5600ft
59
What are the 5 modes of operations for SLQ-25C NIXIE?
1. Swept 2. Noise 3. Alternating 4. Pulsed 5. Random
60
What are the two sonobuoys used and how do they operate?
DIFAR - Passive DICASS - Active
61
What is the pro word for DIFAR?
Pointer
62
What is the pro word for DICASS?
Cadillac
63
What is WQC-2A called?
Gertrude
64
What type of communications does WQC-2A facilitate?
2-way, non-secured communications from ship to submarine, ship to ship
65
How many units are involved in WQC-2A
3 units
66
Where are the WQC-2A units located?
Pilot House, Sonar Equipment Room 2, Sonar Control
67
What does UQN-10 refer to?
it is the ship’s fathometer
68
What is the function of a fathometer?
Measures depth of the water from the keel to ocean bottom
69
How many fathoms can a fathometer measure?
6000 fathoms 1 fathom equals 6 feet, making this a significant measure of depth.
70
What is the equivalent of 1 fathom in feet?
6 feet
71
How many units of the UQN-10 does the ship have and where are they located
4 - Sonar control room(main unit), pilot house, chart room, CIC
72
Where are the repeaters located in relation to the UQN-10?
In the Pilot House, Chart Room, and CIC
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