Hud Warning; Hud Cara - BMS F-16C/D 4.34 Flight Manual

T.O. BMS1F-16CM-1 BMS 4.34 Change 2.00

1.5.7. HUD WARNING

When a relevant malfunction occurs the HUD may display a flashing WARN message in its centre.
VMS provides an audible "WARNING – WARNING" message. The flashing WARN in the HUD cannot
be reset with the MASTER CAUTION button but by the ICP WARN RESET momentary switch instead.
Other smaller warnings may accompany the WARN HUD message such as a flashing FUEL message
in the middle of the HUD, although smaller and below than where the WARN message is displayed or
a steady TRP FUEL on the left of the HUD for instance replacing the NAV mode indication.
Please note: the TFR when out of Standby mode will also trigger a lot of TFR specific warnings in the
HUD. Refer to the TFR system documentation in the TO-BMS1F-16CM-34-1-1 for details.

1.5.8. HUD CARA

The Combined Altitude Radar Altimeter provides accurate reading of aircraft
altitude above ground level (AGL).
Radar altitude is displayed on the HUD below the altitude tape, in a box
preceded by the letter R.
The CARA is controlled by the radar altimeter switch on the SNSR PWR panel,
located on the right console. When the switch is placed in RDR ALT the CARA is
functional. Radar Altitude advisory is provided by the A-LOW page of the UFC
st
that is used to set the CARA A-LOW (1 line).
The set altitude is then repeated on the HUD above the altitude
tape. When altitude goes lower than the CARA A-LOW the VMS
calls "ALTITUDE – ALTITUDE" and the HUD A-LOW flashes.
When the gear is down VMS altitude calls are inhibited but the
HUD CARA A-LOW still flashes.
The CARA has limitations depending on altitude and pitch roll (bank angle).
Pitch or roll angle limits are 10° at 50000 feet, 15° at 25000 ft, 25° at 10000 ft,
30° at 5000 ft and 30° in pitch and 60° in roll at 3000 ft.
A combination of pitch and roll angles further reduces CARA altitude capability.
When outside the specification of the CARA altitude the HUD CARA display is
blanked.
CARA is therefore most useful at low altitudes below 3000 feet.
BMS 4.34 Dash 1
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