EGI Flashcards
What two things make up HNAV
GPS+ INAV
Describe INS / What does it provide / What’s a weakness
Passive, worldwide, self contatined // Att, HDG, Postion, Velocity, Accleration / Only accurate for a short period of time.
Describe GPS / What does it provide/ What’s a weakness
Passive, worldwide // GPS is worldwide precise and regular position // Not self contained and is vilnerable to jamming and spoofing, no heading and attitude
What do P codes give me access to?
Military GPS
What is SAASM
Full selective availability/ anti-spoofing
GAS-1 stands for what?
GPS antenna System
Which EGIs are connected to GAS-1
Both
EGI 2 automatically connects to what if GAS-1 Fails / what about EGI 1
SATCOM/GPS
There is no backup
What are the four EGI Alignment Types
(1) GPS/INS
(2) Gyrocompass (GC)
(3) Stored Heading (SH)
(4) Directional Gyro (DG)
HNAV ( ATT/ HDG Valid / Where/ Align Time )
10 Seconds/ 7 minutes/shore&Shipboard / 15 minutes
Directional Gyro ( ATT/ HDG Valid / Where/ Align Time )
10 Secs/ -/Shore&Shipboard/ 2 minutes
It will take like 2 minutes to get off deck
Store Heading ( ATT/ HDG Valid / Where/ Align Time )
10 Seconds/ 30 seconds / Shore/ 3 minutes
Gyro Compass ( ATT/ HDG Valid / Where/ Align Time )
10 Secs/ 90 Seconds/ shore / 4 mins
Which EGIs are required for full AFCS Function
Both
EGI #2 provides what for AFCS
Pitch+Roll+ +ATT+ HDG + Vel
What does a DG aligment not provide, thus effecting which two functions?
Valid Velocity/ Hover coupler and autp Approach
What is a normal Display for FOM
2 or less
What is a normal display for EHE
Less than 25 ft
What information do the ADCs supply after processing data?
- Barometric altitude and local barometric pressure
- Vertical speed
- Indicated Airspeed (IAS)
- OAT
What configurations can the EGI support?
- Two current legacy EGIs
- A current legacy EGI and a SAASM EGI
- Two SAASM EGIs
What are the two navigation modes of the EGI?
- Hybrid navigation (HNAV)
- Inertial navigation (INAV)
When is the Gyrocompass (GC) alignment type used?
When the helicopter is not in motion on the ground
What does the Directional Gyro (DG) alignment provide?
Attitude and true heading outputs to support a quick launch capability
What does the EGI require for coupled approach and hover function?
Valid heading and velocity data from EGI 2
What is the purpose of manual entry of latitude and longitude in EGI?
Aids in alignment aboard ship or ashore and satellite acquisition
What is required for GPS alignment to begin?
The GPS must acquire and track at least four satellites.
What indicates that aircraft heading has become valid after alignment start?
A heading display on the HSI and ‘HDGV-G’ displayed in Display Area 1 of the MD.
What is the maximum time for a complete GPS alignment?
15 minutes.
What is a Gyro Compass (GC) alignment designed for?
To align an EGI when the aircraft is on the ground.
What is required for Stored Heading (SH) alignment to occur?
A GC alignment must be completed prior to the last shutdown.
What is the main purpose of a Directional Gyro (DG) alignment?
To provide a quick launch capability.
What must be entered by the operator during DG alignment?
Magnetic heading.
