FMS/EGI Flashcards
What data is stored in the FMS and where is that data stored? (Reference Student Handout)
The FMS contains Non-Volatile Memory (NVM) to store data.
1) GPS time and date.
2) Position where shut down.
3) Brightness settings.
4) Aircraft tail number.
5) Engine Torque Factor (ETF).
6) A/C configuration details.
7) Frequencies.
8) Waypoints.
9) Flight Plans.
What status/indication would be displayed in the FMS if a test indicated that the status is unknown or a data path failure has occurred?
“—“
What information is provided by the status line? (Reference Student Handout)
The Status line shall consist of the title and display page numbers.
Can an EGI IBIT be ran in flight?
An EGI cannot be tested in-flight.
What are the three possible “codes” that may be displayed in regard to connectivity issues with the 1553 data bus?
NGO A, NGO B, NGO T
How does the INS detect changes in its geographic position, velocity and orientation?
The INS senses helicopter motions in terms of linear and angular accelerations, linear and angular velocity, position, attitude, platform azimuth, magnetic and true heading, altitude, and body angular rates about three axes (X, Y, and Z). The sensed angular rates and linear accelerations are processed by the EGI software to derive attitude, velocity, and position data. Angular rates are sensed by three zero-locked ring laser gyros. Linear accelerations are sensed by a three-axis accelerometer unit.
What data busses does the FMS communicate with?
1553, ARINC, Ethernet. ALL THREE
The test state is a roll up of the individual subsystem faults. Subsystem test shall have the following states?
“GO”- No active faults exist for the particular subsystem.
“NGO”- At least one fault is active.
“DEG”- For some subsystems, the FMS determines a status of degraded based on one or more subsystem faults and other subsystems provide the FMS a rollup status of degraded.
“TST” – subsystem is in test mode (IBIT).
“—“ Test has not been performed or an initiated test stopped with no results.
When is a Check Test alert displayed
A “CHECK TEST” alert shall be displayed on the FMS alert status line upon report by a subsystem of a “NGO” or “DEG” or “—“ state after a TEST has been completed.
What do status pages show?
Status pages show faults and messages that are discovered during CBIT’s
Communication status fault information related to 1553 will display what codes?
GO (FMS is receiving both channels).
NGO-A (FMS is receiving the B channel).
NGO-B (FMS is receiving the A channel).
NGO-T (FMS is not receiving either channel).
What does STAB DOWN/STAB UP LIMIT indicate?
STAB DOWN/STAB UP LIMIT indicates that the stabilator has contacted the lower/upper limiters of the stab position transducer.
Each FCC has its own longitudinal and lateral accelerometer. What do accelerometers do when electrical power is applied?
on startup the system nulls the accelerometers
How is the EGI accel/rate information used?
EGI accel/rate information is used to aid nulling (slopes vs. shipboard ops)
What determines an FMS to become the BC, the BBC or the RT?
The first FMS to complete BIT becomes the Bus Controller (BC), while the other becomes the backup bus controller (BBC) or remote terminal (RT).
