T.O. BMS1F-16CM-1
BMS 4.34 Change 2.00
BMS 4.34 Dash 1
© Red Dog 2012-2019
Page: 18
1.2.1.3 MANUAL TRIM panel
The Manual TRIM panel provides an additional method for the pilot to
trim the aircraft. Primary trims (roll & pitch) are on the stick. The wheels
and indicators on the MANUAL TRIM provide a backup way to set the
trims by using the relevant wheel or knob.
Rudder trim can only be set on the MANUAL TRIM panel via the YAW
TRIM knob.
In the F-16 trim is often required, especially in asymmetric load
conditions. The 2 indicators move with stick trim input (when energised)
and/or manual trim input. The wheels have a white line marking their centre position.
The TRIM/AP DISC switch is a two-position toggle switch. In NORM the stick trims are energized and
AP operation is possible.
In DISC the stick trims and the autopilot are inhibited. Manual trim remains operative.
The MANUAL TRIM wheels and knobs can be interfaced through keystrokes, mouse clicks or
analogue hardware such as potentiometers. The latter solution gives much better and smoother
results. A little warning about mouse clicks: the way they are implemented is almost impossible to
manage correctly in flight and should be avoided. Left click starts the trim movement and right click
stops the trim action and starts the action in the opposite way. If you need to use the manual trims do
it with keystrokes or analogue devices, not the mouse. Note that the YAW TRIM knob does not move
in BMS when rudder trim is implemented and as a consequence you have no reference for the YAW
TRIM position.
BMS Key Callbacks for the MAN TRIM panel:
SimTrimAPDisc (toggle)
SimTrimAPDISC (DISC switch position)
SimTrimAPNORM (NORM switch position)
SimTrimNoseUp
SimTrimNoseDown
SimTrimRollLeft
SimTrimRollRight
SimTrimYawLeft
SimTrimYawRight
1.2.1.4 FUEL panel
The FUEL MASTER switch is guarded in MASTER position. In some
airforces the guard is even secured in place with a wire. This switch is
not operated by the pilot in normal operations. When placed in OFF the
fuel shutoff valve is closed, preventing fuel from reaching the engine.
The TANK INERTING switch is unsupported in BMS. In the real jet it reduces internal tank
pressurisation
.
The ENG FEED knob controls the way the fuel is pumped to the engine. Note that the fuel goes to the
engine by gravity feed, so the engine will not starve when the fuel pumps are OFF. Use of the pumps
prevents fuel starvation during negative G maneuvers and allows manual fuel balance whenever
necessary.
OFF - all pumps are off.
NORM - all pumps are on, the CG (Centre of Gravity) is maintained automatically.
AFT - aft pumps are on. Fuel is transferred from the AFT tank to the engine. The CG moves forward.
FWD
– forward pumps are on. Fuel is transferred from the FWD tank to the engine. CG moves back.
The AIR REFUEL switch is a two-position toggle switch. It opens or closes the Air Refuelling door.
Upon opening the AR door the FLCS switches to takeoff and landing gains (if airspeed is below 400
knots). It also reduces internal tank pressurisation and depressurises external tanks, so they can be
filled at air to air refuelling.
Summary of Contents for F-16C/D 4.34
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