BMS F-16C/D 4.34, Flight Manual

Page: 123 / 234

T.O. BMS1F-16CM-1 BMS 4.34 Change 2.00
BMS 4.34 Dash 1
© Red Dog 2012-2019
Page: 123
The fuel pumps from the fuel tanks to the FFP are operated through the ENG FEED knob located on
the FUEL panel on the left console. It operates as follows:
•
With the knob in OFF none of the pumps work and fuel transfer occurs only via gravity and
siphoning action. During heavy manoeuvring or negative G the engine may flame out.
•
The NORM position activates pumps for both systems (F/R & A/L) and maintains CG position
automatically.
•
When the knob is placed in AFT the AFT pump works and fuel is pumped from the AFT
reservoir tank to the engine. The CG moves forward.
•
When the knob is placed in FWD the FWD pump works and fuel is pumped from the FWD
reservoir tank to the engine. The CG moves aft.
Please note, as the reservoir tanks start to empty the possibility of negative Gs starving the engine of
fuel increases significantly. Avoid negative G loads with less than 1000 lbs. of fuel remaining.
1.7.3. Fuel pressurisation
Fuel pressurisation is only partially implemented in BMS.
For fuel to transfer from the external tanks they have to be pressurized. This is done with the AIR
SOURCE knob on the AIR COND panel on the right console:
This knob controls the ECS system and thus pressurisation of the cockpit and the fuel tanks. Fuel
tanks are pressurized only in NORM and DUMP position. In NORM both the cockpit and fuel tanks are
pressurized, in DUMP only the fuel tanks are pressurized.
This is implemented and failure to pressurize the fuel tanks with the AIR SOURCE knob may trigger
TRP FUEL conditions.
When air refuelling the fuel goes from the AR receptacle to the wing tanks and to any external tanks if
carried. Normally to allow the fuel to transfer into the external tanks the pressurisation would need to
be decreased.
This would normally be done with the TANK INERTING switch located on the fuel panel in the left
console. Unfortunately that function is not implemented in BMS and as a consequence A-A and hotpit
refuelling does not require tank inerting when external tanks are carried.
That being said some depressurisation is simulated in the current code when opening the AR door.
This prevents fuel from flowing from the external wing tank to the internal wing tank when the AR door
is opened.