I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 97
FOR SIMULATION USE ONLY – NOT A TRAINING AID
Crew Alert System (CAS)
Red (Warning) Message Cause/Explanation
BATT BUS Battery Bus inoperative
GEN BUS Generator Bus inoperative
PMU FAIL Power Management Unit failure
GEN Generator inoperative
CKPT PX
Cockpit over pressurization; pressure exceeds 3.9
to 4.0 psi
CANOPY Canopy unlocked/unsafe
FUEL PX Fuel pressure below 10 psi
OIL PX
Oil pressure below 40 psi above idle, below 15 psi
at idle, or oil pressure between 15-40 psi at
idle for 5 seconds or more
OBOGS FAIL OBOGS system failure
CHIP Engine chip detector indicates oil contamination.
ADC FAIL Air data computer failed.
EDM FAIL Engine data manager failed.
CHK ENG
Engine parameters have exceeded operating
limitations.
Amber (Caution) Message Cause/Explanation
CKPT ALT Cockpit pressure altitude above 19,000 feet
DUCT TEMP Environmental duct or defog duct above 300 °F
HYD FL LO
Hydraulic reservoir fluid level below 55 cubic
inches (1qt)
BUS TIE BUS TIE switch open, or bus tie inoperative
FUEL BAL
Fuel imbalance exceeds 30 pounds, or fuel probe or
EDM fail
EHYD PX LO Emergency hydraulic pressure at or below 2400 psi
OBOGS TEMP OBOGS temperature above 200 °F
TAD FAIL Rudder trim aid device failure
L FUEL LO Left wing tank below 110 pounds usable fuel
Crew Alert System (CAS) (continued)
R FUEL LO Right wing tank below 110 pounds usable fuel
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