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power (typically a slight increase in N2 rpm). The alternate idle schedules are deactivated with WonW,
when spin recovery mode is engaged, or when the inflight refueling probe, landing gear, or hook are
extended.
2.1.1.1.8 Fan Speed Lockup. The fan speed lockup system prevents inlet instability (buzz) at high
Mach by holding engine speed and airflow at military power levels when the throttle(s) are retarded
below MIL. Speed lockup is activated when the aircraft accelerates above 1.23 Mach and deactivated
when the aircraft decelerates below 1.18 Mach.
2.1.1.1.9 SETLIM - Supersonic Engine Thrust Limiting. SETLIM minimizes the potential for an
aircraft departure due to asymmetric thrust following an engine stall or flameout at certain supersonic
(Mach greater than 1.8), or high-q conditions equivalent to approximately 700 KCAS at sea level or 750
KCAS at 25,000 feet. If the FADEC detects a stall or flameout condition, this function terminates
afterburner operation in both engines. Normal afterburner operation is restored 12 seconds after
engine recovery or immediately when airspeed drops below 1.7 Mach and q-conditions are equivalent
to approximately 650 KCAS at sea level or 710 KCAS at 25,000 feet.
2.1.1.1.10 RATS - Reduced Authority Thrust System. The reduced authority thrust system (RATS)
reduces the wind-over-deck required for carrier landings by rapidly reducing thrust at the beginning
of a successful arrestment, reducing the energy absorbed by the arresting gear. RATS logic, only
resident in MC1, declares a successful arrestment if the landing gear and arresting hook are down and
longitudinal deceleration is more than 1.0 g (a typical arrestment is approximately 3 g). MC1 sends a
²set RATS on² signal to the FADECs, which reduce thrust to approximately 70% of MIL power. RATS
logic also senses WonW, wheel speed (less than 20 knots), and THA to prevent the engines from
spooling back to MIL power at the end of cable pullout. RATS operation is canceled when the throttles
are reduced to IDLE (THA less than 10°). RATS operation is inhibited during single engine operation.
RATS operation can be overridden by advancing the throttles to full afterburner (THA within 2° of
the MAX stop). With RATS enabled, afterburner operation is inhibited if the throttles are
subsequently advanced to afterburner (below the MAX stop). If the throttles are in afterburner (below
the MAX stop) during an arrested landing, RATS functions normally, rolling back both the main
engine and the afterburner.
2.1.1.1.11 AGI - Armament Gas Ingestion Protection. AGI protection was designed to provide
preemptive engine ignition in case armament gas ingestion caused an engine flameout. As mechanized,
AGI protection is a backup to the FADEC's inherent flameout detection and relight logic. While flight
test data indicates that the system may not be needed, AGI protection remains functional.
The AGI signal is sent by the Stores Management Set (SMS) to the FADECs and is used to initiate
engine ignition (both engines) for a period of 5 seconds. The signal is sent when the trigger is squeezed
(second detent) for the gun, any A/A weapon, or when the pickle is pushed for any selected A/G
missile/rocket. AGI is functional in the SIM mode as well as the tactical mode.
A1-F18EA-NFM-000
I-2-4 ORIGINAL
2.1.1.1.12 ABLIM - Afterburner Limiting Function. The ABLIM function limits engine power to
half afterburner with the throttles at MAX to prevent engine stalls due to exhaust gas reingestion. The
system is only to be used during carrier-based operations. The function is pilot selectable with WonW.
The system defaults to disabled (unboxed) after engine start. The ABLIM function is activated by
selecting (boxing) the ABLIM option on the CHKLIST format with the FLAP switch in HALF or
FULL. The ABLIM advisory is set to confirm that the function has been activated on both engines.
With the function activated, only half afterburner power is available with the throttles at MAX.
Indicated fuel flows are reduced from 35,000 to 45,000 pph to about 25,000 pph. The function is
automatically deactivated with acceleration due to a catapult launch, at 80 KCAS, or with WoffW. The
ABLIM function is disabled with a FCC CH 1, 2, or 4; MC1, FADEC, or INS failure.
2.1.1.2 Engine Related Cautions and Advisories. The following engine related cautions and advisories
are described in the Warning/Caution/Advisory Displays in Part V:
· L or R EGT HIGH
· L or R ENG
· L or R ENG VIB
· FADEC HOT (ground only)
· L or R FLAMEOUT
· NO RATS
· L or R OIL HOT (engine or AMAD)
· L or R OIL PR
· L or R OVRSPD
· L or R STALL
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本文链接地址：
NATOPS Flight Manual 飞行手册 1(31)
