Comm/Nav Flashcards

1
Q

EGI

A

Embedded GPS Inertial Navigation System

consists of a 12 or 24 channel coarse acquisition system and precise (P) code GPS receivers with full selective availability/anti-spoofing (SASSM) capability embedded in an all attitude ring laser gyro

SAASM EGIs have direct Y code acquisition

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2
Q

INS? Disadvantage?

A

Worldwide, passive and self contained, provides heading/attitude data

precisely accurate for only a short amount of time

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3
Q

GPS? Disadvantage?

A

worldwide, passive, updates INS

not self contained, vulnerable to jamming and spoofing, incapable of providing aircraft heading and attitude info

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4
Q

GAS 1

A

7 element anti-jam controlled reception pattern antenna with an antenna electronics (AE) unit that nulls out suspected erroneous signals
backup unit provides GPS signal to EGI 2 if AE fails via DTIU

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5
Q

Which EGIs connected to GAS 1?

A

Both; in event of SATCOM (AE) failure, EGI 2 auto connects to backup unit

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6
Q

EGI modes

A
  1. Default HNAV
  2. Commanded HNAV
  3. Gyro compass
  4. Stored Heading
  5. Directional gyro
  6. data link/manual
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7
Q

Stored heading requires what?

A

completion of GC alignment, orderly shutdown, parking brake set

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8
Q

Shore only EGI modes?

A

Gyro compass, stored heading

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9
Q

Which EGI mode is used for quick launch?

A

Directional gyro

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10
Q

Comms B/U/Failure Modes

A
  1. Single mission computer failure
  2. 1553 data bus failure
  3. AMC or OCP failure
  4. Battery mode
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11
Q

Single Mission Computer failure

A

amc operational, ac power available, no impact on radio or ics

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12
Q

1553 Data Bus Failure

A

amc operational, ac power available, No impact on ICS, radios function normally but can only be selected via OCP and only tuned via RCU

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13
Q

AMC or OCP Failure

A

mission computers are operational, ac power available
after a/c power transients
RAD 1 is hardwired to pilot station, 2 to copilot, both controlled by RCU, PTT only
ICS Call available all stations

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14
Q

Battery mode

A

electrical problem or prior to APU start; dc battery power available
only radio 1 available, controlled by RCU, PTT only
ICS PTT (fixed volume) available to pilots
ICS available to aft stations

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