SH/HH-60F/H EAWS SPECIFIC

1. State the purpose of the following communication system:

a. Very High Frequency/Ultra High Frequency radio set:
Line of sight communication. Two radios provide AM, FM, VHF, and UHF coverage between 30.00 MHz and 399.975 MHz.
b. High Frequency radio set:
Over the horizon. The HF radio operates in the frequency range of 2 to 29.9999 MHz, with 280,000 channels at intervals of 100 Hz.
c. Intercommunication system ICS:
Internal communications (talking to one another in the aircraft) 7 stations on the SH-60F, 6 on the HH-60H.

a. Tactical air navigation:
The TACAN navigation set consists of a receiver/transmitter and control. The TACAN set receives an UHF signal from a TACAN surface station (ground or shipboard) or aircraft and calculates the magnetic bearing and slant range to that station.
b. Global Position System:
GPS processes signal received from 4 GPS satellites to compute a position and provides latitudinal and longitudinal coordinates of the aircraft’s present position to the TDP.
c. Compass:
There are two displacement gyroscopes. Each gyroscope consists of a vertical and a directional gyro, mounted in multiple gimbals. Synchro outputs representing heading, roll, and pitch, and roll synchro signals to the TDP and to AFCS for distribution to the various equipment.
d. Doppler:
The DOPPLER radar navigation set is the ground speed sensor for the main backup (to the GPS) tactical navigation system. It provides three axis velocities that are used to compute the ground speed that may be displayed on the HSVD.

a. Smoothes out the flight control to enable the pilot to handle the aircraft. Improves aircraft handling
and stability, controls pitch roll and yaw. b. Made up of three systems:

a. Stability Augmentation System (SAS).
b. Stabilator.
c. DAFCS.

a. Tactical navigation:
Collects navigation information for visual display on cockpit indicators. b. Identification Friend or Foe (IFF):
Replies to interrogations from other aircraft or ships. H-60 has respond only capability. Five modes 1-4 and C, Mode 4 is military use only.
c. Mission Data Loader (MDL):
Programmable data cartridge for flight plans etc.
d. Downed Aviator Locator System (DALS):
Locks on signal from PRC-112 provides pilots with direction of flight and distance to find downed aviator or aircrew.
e. Heads Up Display (HUD):
Used in HH-60H in conjunction with NVG goggles. Provides flight parameter information through the NVG’s.
f. Sonar detecting ranging set:
Used as either a variable depth passive/active or an acoustic processor for display of passive/active sonobuoy information. Also provides under water communications (UQC) and water temperature (BT) reading.

5. State the purpose of the following survivability system:

a. Radar warning:
The radar signal detecting set detects radar tracking (high-band) and missile guidance (low-band) signals which may represent a threat to the helicopter. The system provides visual directional indication of the source if a tracking signal, indicates when a tracking radar has locked onto the helicopter, and identifies the presence of low-band signals used for missile guidance.
b. Missile warning:
The Missile Warning Set (MWS) is an electronic countermeasure unit designed to protect helicopters and low, slow flying aircrft against surface to air and air to air missiles. The MWS will detect a missile fired at the aircraft and provide a sector warning message to the pilot through the indictor and control unit of the AN/APR-39A(V) Radar Signal Detecting Set
c. Laser warning:
The AN/AVR-2 Laser Detecting Set (LDS) is a frequency extension of the AN/APR-39 Radar Signal Detecting Set (RSDS). The LDS shares three of the ten RSDS’s Weapon Replaceable Assemblies (WRA’s). The LDS detects and displays to the aircraft pilot information concerning the laser environment around the aircraft.
d. Countermeasures:
Dispenses metallic chaff, flares, and two other categories of expendables to defeat air intercept, anti-aircraft artillery, and surface to air missiles.

6. State the purpose of the following flight instruments:

a. Horizontal Situation Video Display (HSVD):
Primary flight instruments display.
b. Attitude Indicator (AI):
Provides displays aircraft attitude also known as artificial horizon.
c. Radar altimeter:
Reads distance from aircraft to ground 0-5000 ft.
d. Barometric altimeter:
Reads aircraft position above sea level.
e. Vertical Speed Indicator (VSI):
Indicates vertical speed.
f. Airspeed Indicator (AI):
Measures difference between impact pressure and static pressure.

7. State the purpose/location of the position and anti-collision lights.

a. Position lights:
White light located tail rotor pylon/ red light on the left and green on right main landing gear sponsons or stub wings.
b. Anti-collision lights:
On top of the tail underside of tail cone clear lens for day and red lens for night.
c. Both used as navigational aids.

a. AC generator:
Produces A/C power 115 volts ac 3 phase 400 Hz.
b. Generator control unit:
Controls generator. Regulates output and protects against over, under volts and feed faults.

9. Briefly describe and state the purpose of the following ASW system components:

a. Transducer:
A waterproof sensor holding active projectors and passive receiver’s as well as electronic equipment and batteries. Actively and passively detects underwater contacts.
b. Reeling machine:
Hydraulically operated reeling machine, with an AC back up motor, incorporating a hand crank reeling capability. Used to raised and lower sonar transducer.
c. Azimuth range indicator:
Circular display. Displays all active and passive information.
d. Sonobouy receiver:
4 receivers. Receivers radio information from sonobouies and routes to SDC.
e. Sonar data computer:
Computer that receives, process all acoustic information and formats them for display.