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protection for 10 to 70 seconds.
2.12.11.2 AV COOL Switch. The AV COOL switch, located on the lower right instrument panel, is
used to deploy the FCS ram air scoop for emergency cooling of FCC A and the right TR. The AV COOL
switch should be placed in EMERG if an FCS HOT caution is displayed or during ECS OFF/RAM
mode operation as a preventative measure.
EMERG Deploys the FCS ram air scoop and provides direct ram air cooling of FCC A and the
right TR.
NORM FCS ram air scoop not deployed. Once deployed, the FCS ram air scoop cannot be
closed inflight.
2.12.12 LCS - Liquid Cooling System. The LCS is a closed loop system normally used to transfer
heat from the radar transmitter to fuel and/or ambient air. When fuel temperatures are warmer than
the radar coolant (typically at low fuel levels and high ambient temperatures), the LCS is used to
transfer heat from the fuel to ambient air. The LCS contains a pump, a liquid coolant/air heat
exchanger, and an LCS ground cooling fan (all three located in the left LEX) and two LCS/fuel heat
exchangers. The liquid coolant/air heat exchanger has two ram air inlets (upper and lower) and one
ram air exhaust duct (bottom of the LEX). The LCS ground cooling fan is located in the lower ram air
inlet.
During ground operations with normal fuel temperatures, the pump and LCS ground cooling fan are
activated when power is applied to the radar (RADAR knob in STBY, OPR, or EMERG). Fan air is
the primary cooling source on the ground. A temperature sensing bypass valve directs radar liquid
coolant to the LCS/fuel heat exchangers only when coolant temperature is warm (greater than 27°C).
Inflight, the ground cooling fan is off, the lower inlet is closed, and the upper inlet is controlled by
the mission computer. Heat is transferred to the fuel system through the LCS/feed tank heat
exchangers. The upper ram air inlet is commanded open when feed tank temperatures are excessive
(greater than 40°C), ram air is cooler than fuel, and AOA is below 15°.
During ground operations with feed tank temperatures above 40°C, the pump and LCS ground
cooling fan are commanded on regardless of RADAR knob position to provide ram air cooling for the
A1-F18EA-NFM-000
I-2-98 ORIGINAL
fuel system. In this case, placing the RADAR knob to OFF removes the radar as a heat source, aids LCS
fuel cooling, and extends ground operating time.
2.12.13 ECS Related Warning, Cautions, and Advisories. The following ECS related warnings,
cautions, and advisories are described in the Warning/Caution/Advisory Displays in Part V:
· L BLEED and R BLEED warning lights
· BLEED AIR LEFT (RIGHT) voice alert
· AV AIR HOT caution
· L or R BLD OFF cautions
· ECS ICING caution
· EXT TANK caution
· FCS HOT caution
· FLIR OVRHT caution
· GUN GAS caution
· TK PRES LO caution
· TK PRES HI caution
· WDSHLD HOT caution
· ECSDR advisory
2.13 OXYGEN SYSTEMS
2.13.1 OBOGS - On Board Oxygen Generating System. While the engine(s) are operating, OBOGS
provides a continuously available supply of oxygen for the aircrew. The OBOGS concentrator receives
air from one of two sources: cool ECS air downstream of the secondary heat exchanger and warm air
downstream of the primary heat exchanger. An OBOGS inlet air shuttle valve (solenoid operated and
pneumatically controlled) controls which pressure source is utilized. With WonW, the shuttle valve is
positioned to accept the warm air source to conserve cabin/avionics cooling capacity. Inflight, the
shuttle valve selects the source with the highest pressure.
The OBOGS concentrator receives power from the left 115 /200 volt ac bus. Dual molecular sieves
in the OBOGS concentrator remove most of the nitrogen from the bleed air. Nitrogen is dumped
overboard while the output of oxygen rich breathing gas is supplied to the aircrew. The oxygen is
routed from the concentrator to a cockpit plenum, where the temperature is stabilized and a limited
supply is stored for peak flow demands.
The cockpit OBOGS monitor continuously measures the breathing gas oxygen concentration and
provides a discrete signal to cause an OBOGS DEGD caution if the oxygen concentration falls below
an acceptable level. From the plenum, the oxygen flows through the pilot services panel oxygen
disconnect, through the seat survival kit, and to the aircrew regulators and masks.
An OBOGS failure may not be accompanied by a loss of flow or an OBOGS DEGD caution. Good air
flow does not guarantee adequate oxygen concentration. An OBOGS failure due to a total loss of bleed
air or electrical power results in abrupt termination of oxygen flow without an OBOGS DEGD caution.
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本文链接地址：
NATOPS Flight Manual 飞行手册 1(82)
