I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 88
FOR SIMULATION USE ONLY ā NOT A TRAINING AID
located in the front cockpit. If the preset database is loaded, up to 99 preset
frequencies can be selected from the IACs for retrieval by the UFCP.
The active COM2 frequency is displayed in W2 of the UFCP persistent display.
Power is provided through a circuit breaker, placarded COM2, located on the
generator bus circuit breaker panel in the front cockpit and by the auxiliary battery
with emergency tuning through the backup VHF control head.
TRANSPONDER
The aircraft is fitted with an altitude-reporting Mode S transponder that replies to
ground station and airborne interrogations.
Control of the transponder is provided through the UFCP.
The transponder provides three modes of operation: backup, active, and altitude
reporting. When in standby (SBY displayed in W4 of the UFCP persistent display),
the transponder code may be selected, but the transponder will not respond to
ground or airborne interrogations.
When set to active (blank display next to transponder code on W4 of the persistent
UFCP display), the transponder code may be selected and the transponder
transmits the selected code when interrogated, but will not provide altitude
reporting information. When set to altitude reporting (ALT and transponder code
displayed in the W4 on the UFCP), the transponder code may be selected and
responds to interrogations with the selected code and altitude information received
from the air data computer.
The transponder system provides modes A, C, and S for operation in the air traffic
control radar beacon system (ATCRBS). The transponder accepts altitude (air data)
information from the air data computer via the data bus for altitude encoding. When
queried by a radar system (ATC or airborne collision warning), the transponder
sends a reply which includes the transponder code and aircraft pressure altitude.
Power is provided through a circuit breaker, placarded XPDR, located on the
generator bus circuit breaker panel in the front cockpit.
VERY HIGH FREQUENCY (VHF) NAVIGATION (NAV) SYSTEM
The very high frequency (VHF) navigation (NAV) system provides VHF Omni-
directional range (VOR), Omni-directional navigation and instrument landing system
(ILS) capability, including localizer (LOC) and glideslope (GLS) reception.
The NAV receiver provides 200 VOR/LOC channels from 108.00 to 117.95 MHz; 40
glideslope channels from 329.15 to 335.00 MHz, which are automatically paired with
localizer channels; and a marker beacon receiver tuned to 75.00 MHz
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