T-45 Master Alert Lights

• CAUSES (any)
• A/C system - overpressure to CAU compressor
• CAU compressor outlet temp > 500°F
• CAU compressor inlet temp > 250°F
• Cockpit ALT > 24,500 ±500

May be due to high AOA or low Airspeed

• EGT ≥650 ± 8°C
• N1 RPM ≥ 112.4 ± 1%

• Engine bay fire detected
• >300°C

• Secondary indications:
• - Rising EGT
• - Excessive fuel flow
• - Erratic or rough engine operation
• - visible flames or smoke trail
• - EGT/RPM and/or OIL PRESS
• - HYD
• - TP HOT
• - abnormal fuel flow
• - visible signs of smoke

• Generator Failure
• - Only caused by undervoltage condition (<25 V)

• C AUG or F PRES may also illuminate
• - C AUG (due to SADS inop)
• - F PRES (boost pumps shutdown after 30 seconds)
• HUD & Right MFDs will shut off
• Left MFDs default ADI, powered 2 mins (unless ORIDE)
• MIP or CONSOLE lights come on (if not off)

If GEN will not reset and voltage shows 27-29 volts, likely cause is undervoltage sensing unit failure.

• GTS Bay fire detected
• >300°C

Hook position does not agree with handle

• >300 KIAS, airloads may prevent hook from fully extending.
• - < 300 KIAS, hook extends and warning should extinguish

Total hydraulic pressure loss

• HYD1 <1660 ± 110 psi
• HYD2 <1660 ± 110 psi
• RAT   <  600 ±   50 psi

• In-flight
• CAUSES (all required)
• Launch bar not retracted,
• ALL landing gear down & locked,
• Weight off wheels for > 10 seconds

Launch bar will mechanically retract when gear is retracted, but may extend again upon gear extension

Altitude (AGL) below LAW setting

One landing gear differs from Handle position

• Handle Down
• All gear not down and locked

• Handle Up
• All gear doors are not up and locked

Front cockpit MASTER ARM Switch set to ARM

Oil Pressure low - < 3 psi differential (supply vs scavenge)

Momentary illumination acceptable under positive g flight following period of zero or negative g.

Issue with OBOGS system

• CAUSES
• - Concentration or supply pressure below acceptable limits
• - Heat Exchanger failure
• - bleed air supply > 250°C
• - OBOGS BIT failure
• - OBOGS/ANTI-G switch is OFF

• Indications
• - OXYGEN
• - Problem breathing
• - Hypoxia

Transient OXYGEN warning during engine start or initial startup does not necessarily indicate system failure requiring mission abort.

Persistent intermittent OXYGEN warning lights may be indicative of OBOGS failure requiring mission abort.

Free flowing mask can induce OXYGEN warning light and is not indicative of system failure requiring mission abort.

HPC PRESS at IDLE might already be 27 psi or above. In this case, increasing RPM may mask leak in system.

If prolonged breathing on OBOGS required on deck, maintain adjusted N2 RPM to keep HPC PRESS at least 27 psi (if practical)

• LDG handle is not set to DN when Throttle below 95% n2 and either:
• - Altitude below 7,200 MSL (9,500 ± 300 climbing, 7,700 ± 500 descending) & < 170 KIAS
• - OR
• - FLAPS/SLATS lever not set to UP.

Either or both AC inverters have failed.

If already illuminated and second inverter fails, no additional warning will be given.

Shot of fuel solenoid or steam ingestion valve is not in proper position.

Shot of fuel solenoid - Altitude below 7,200 MSL (9,500 ± 300 climbing, 7,700 ± 500 descending)

Steam Ingestion valve - Opened when Launch bar not retracted, Weight on wheels, and N2 >70% (rpm provides the switching)

May occur temporarily when passign in close proximity to another aircraft's exhaust on deck.

• Avionics bay air > 67°C
• GROUND INDICATION ONLY

• IN CATAPULT
• Brake pressure release system has failed, meaning brake pressure is available.
• Brake pressure release system
• - MLG down and locked
• - Launch Bar switch UP
• - Throttle > 95%
• - Parking brake handle - IN
• - NWS button not depressed
• Meeting the above conditions will release brake pressure for launch

Having throttle below 95% will restore brake pressure in emergency situation.

• Caution light only
• Illuminated when canopy unlocked

• Master alert Light & tone
• Throttle above 95%

• CAUSES
• - Control Aug off (paddle switch)
• - Control AUG degraded
• - IBIT in progress

• Functions of C AUG
• Weight off wheels & < 217 KIAS
• - Yaw damp
• - Turn coordination (also requires Flaps/slats lever to 1/2 or DOWN)

• Available weight-on and weight-off wheels
• - Speed-brake-to-Stab interconnect
• - Rudder trim

A landing gear door is not up and locked

If DOOR is due to a fault in emergency gear extension system, NWS may be inoperative. Be prepared to execute go-around and subsequent Short Field Arrestment if NWS is inop.

ECA dual channel failure

Likely to result in a no trim position (increase RPM and EGT - must be controlled carefully)

Unlikely to result in full trim (only if failure occurs when throttle is moved initially). EGT, RPM, and thrust decreases.

• CAUSES
• Fuel pressurization failure
• Fuel boost pump failure
• ADR Failure
• One or both ENGINE switches set to OFF

Avoid negative g and abrupt maneuvers

Fuel boiling/vaporizing may occur above 25,000 MSL

Collector tank < 350 pounds

HYD 1 and/or HYD 2 pressure <1660 ± 110 psi.

Must check HYD gauge to determine system

No additional alert if other system falls below 1660 ± 110 (MONITOR GAUGES)

Extinguishes when both HYD 1 & HYD 2 pressure is ≥ 2000 psi

• Engine driven low pressure fuel pump failure/outlet pressure low (<35 psi)
• LP pump filter blocked

Manual fuel system is selected

• A warning or caution has been activated
• Audio alert until silenced

Nosewheel steering failure or paddled off

NWS AUG failure

• Momentarily pressing NWS button causes the NWS AUG to attempt a reset.
• - If clears, NWS AUG extinguishes and returns to normal operation
• - If still failed, NWS AUG remains on

Throttle above intermediate psotion (60-70% rpm) and parking brake set

RAT is extended

• Uncommanded RAT extension
• RAT illuminated
• normal HYD 2 pressure
• HYD NOT illuminated

To verify HYD 2 pump integrity, may need > 80% rpm.

One or both seats not armed and throttle above intermediate position (approx 60-70%)

Anti-skid system failure

• CAUSES
• Slats not in selected position(one or both)
• Split slats
• >217 KIAS with FLAPS/SLATS selected 1/2 or down (slats will not extend)

Split slats or no flaps, abrupt roll off with no stall warning may occur at clean stall AOA (approx. 25 units).

• Tailpipe bay temperature has exceeded limits.
• >150°C

Designated COMM is controlled by aft cockpit

• CAUSE
• Attitude data is invalid

• RESULT
• ADI attitude info removed

• If restart attempted, GINA attempts an alighment until attitudes are valid.
• - Attitude info not available until alignment progress to point where attitude is valid.
• INS alignment: up to 3 minutes
• In-Flight align: must be straight & level
• Shipboard: up 18 minutes

A BIT failure has occurred

May be simulated

Fuel below BINGO setting

• GPS corridor violation (estimated error)
• - GPS mode only

Single lane ECA failure

Flaps fully extended

Designated COMM or NAV is controlled by forward cockpit

• CAUSE
• Glideslope invalid

• RESULT
• Glideslope steering needle removed

GTS is at IDLE speed and ready for start

Flaps are in 1/2 position

• Localizer and glideslope invalid
• Both needles removed

Launch bar is extended on the deck, and LAUNCH BAR switch set to EXTEND

LEFT MLG is down and locked

• Localizer invalid
• Localizer needle removed

Manual fuel system selected

INS and GPS outputs do not agree within a certain threshold

NLG is down and locked

NWS High gain in use

• CAUSE
• Positional data invalid

• RESULT
• Heading and velocity data removed

• If restart attempted, GINA attempts to an alignments until attitudes are valid.
• INS alignment: up to 3 minutes
• In-Flight align: must be straight and level
• Shipboard align: up to 18 minutes

N1 ≥ 100 rpm in correct direction and ignitors on

Right MLG down and locked

Improper discrete being input to DEU, MFDs, and HUD remain inoperative

Anti-skid system is selected

Speed brakes partially extended

Speed brakes fully extended