BMS F-16C/D 4.34, Flight Manual

Page: 19 / 234

T.O. BMS1F-16CM-1 BMS 4.34 Change 2.00
BMS 4.34 Dash 1
© Red Dog 2012-2019
Page: 19
BMS Key Callbacks for the FUEL panel:
SimToggleMasterFuel
SimMasterFuelOn
SimMasterFuelOff
SimDecFuelPump
SimIncFuelPump
SimFuelPumpOff
SimFuelPumpNorm
SimFuelPumpAft
SimFuelPumpFwd
SimFuelDoorToggle
SimFuelDoorOpen
SimFuelDoorClose
1.2.1.5 IFF panel
BMS 4.34 introduced a fully implemented IFF system and the AUX
COMM panel has been replaced with the IFF panel in some AIFF
equipped aircraft. Backup TACAN controls have been moved to a MFD
page and have been replaced by backup IFF controls. Please note,
some non AIFF aircraft still have the AUX COMM panel (see below).
For more information about the IFF system, please refer to Chapter 1.16
IFF.
The IFF MASTER knob controls power to the IFF transponder/interrogator unit..
in OFF the system is unpowered. In STBY the system is powered but unable to answer IFF
interrogations. In LOW the IFF is operating normally (can interrogate) but responds to interrogation at
half effective distance (reduced interrogation range). NORM is the normal operation position; the IFF
can interrogate and respond to interrogations.
In EMER, the IFF can interrogate but responds to interrogations with a fixed emergency code:
(Mode 1: 70; Mode 2: 7777 and Mode 3: 7700; Mode C and Mode 4 response is normal)
The M-4 CODE switch controls how the IFF responds to mode-4 interrogations.
A/B is the normal operation position; the IFF uses the normal secret key that is either stored in A or B
bank (set in UFC for normal operations and set with the Mode 4 reply switch in backup mode).
In ZERO, both code A and code B are erased from memory when the position is held for 2 seconds
(keys are also erased automatically upon shutdown).
In HOLD, power-off zeroing is temporarily disabled and the Mode 4 codes are saved.
The CNI knob allows the pilot to toggle between the BACKUP system and the UFC (Up Front
Controller). The heart of the F-16 cockpit is the UFC made of the ICP, the DED and the two MFDs.
Those need the main generator running and are thus unavailable at ramp start, shut down or in the
event of malfunction or battle damage. In that case the CNI switch needs to be placed in BACKUP
which provides alternate operation of the UHF, IFF and other systems.
The IFF enable switch enables control of IFF modes in backup mode (CNI in Backup position).
Normal IFF controls are set through the IFF UFC pages (more information in the UFC chapter)
M1/M3 enables Mode 1 and Mode 3 responses with the relevant codes inputted in the backup IFF
digits codes.
M3/MS enables Mode 3 and Mode S responses (Mode S is not implemented in BMS 4.34).
The digit selectors of the IFF panel are relevant to Mode 1 and Mode 3 IFF codes. Do not confuse
them with the old TACAN channel digit selectors on the AUX COMM panel.
The MODE 4 REPLY switch is a three-position switch that controls the Mode 4 reply in backup mode
OFF: no response to mode4 interrogation. A: reply to Mode 4 interrogations with code A, B: reply to
Mode 4 interrogations with code B.
The MODE4 MONITOR switch enables AUDIO feedback of the IFF system in AUDIO position. No
audio feedback is provided in OUT position. Audio feedback is a tone which signals the inability of the
system to answer a Mode 4 interrogation correctly.