Reversion Control Panel
Overview
The Reversion Control Panel is used to control cursor inhibition, toggle EICAS display modes, and cancel aural alerts.
Control Elements Description
CURSOR INHIB Button
- Function: Inhibits cursor movement on the corresponding flight display.
- Light ON (white): Inhibition active.
- Light OFF: Inhibition canceled.
EICAS Reversion Selector Knob
- Three selectable positions:
- REV (Reversion): Activates when two or more IDU display units fail; shows compressed format with PFD + EICAS.
- NORM (Normal): PFD shown on left IDU, EICAS shown on right IDU2.
- SWAP: When only IDU5 fails or all IDUs are functioning normally, EICAS is shown on the left side of IDU3.
AURAL ALERT Cancel Button
- CNCL Button: Momentary push to cancel aural warning chimes.
IRS Select Buttons (L/R)
- Function: Manually select the IRS data source for PFD when IRS voting fails.
- Note:
- Buttons are disabled during normal IRS operation.
- If IRS voting fails, the system defaults to IRS1 → IRS3 → IRS2 (or IRS2 → IRS3 → IRS1) in sequence.
EMER COMM Button
- ON (Light ON): Activates emergency communication. VHF 1 auto-tunes to 121.500 MHz, VHF 1 becomes untunable via TCP; other VHF radios remain unaffected.
- Light OFF: Emergency communication not active.
G/S CNCL (Glideslope Cancel) Button
- Function: Cancels "Glideslope" aural alerts when triggered.
- Light ON: Cancellation in effect.
- Light OFF: Not active.
AURAL ALERT CNCL Button
- Function: Cancels continuous aural alerts in the cockpit, including those that cannot be silenced via MASTER WARN or MASTER CAUT.
- After Pressing: EICAS will show a cyan message: "AURAL CANCELED".
- Light OFF: No active alerts.