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poor roll coordination for large lateral inputs, pitch coupling, and/or sluggish pitch response can be
expected. Due to the higher reliability of AHRS over previous rate and acceleration sensors, a four
channel failure is highly unlikely. However, simulator evaluation has shown that a complete four
channel AHRS failure (no rate and acceleration inputs to FCCs) is controllable for most of the flight
envelope with the flaps in AUTO. Refer to figure 11-1 for AHRS channel failure indications and effects.
AHRS failure modes have not been flight tested. With a four channel
AHRS failure, the aircraft is not controllable with the flaps in HALF or
FULL. At altitudes above 25,000 feet, loss of control occurs below 0.92
Mach. For loss of AHRS above 25,000 feet, maintain airspeed above 0.92
Mach while descending.
With a four channel failure at altitudes below 20,000 feet, flying qualities are best between 190 to 210
KCAS. The worst flying qualities are between 270 to 370 KCAS. Flying qualities do improve above 370
KCAS, with a further improvement at supersonic speeds. Execute a straight-in on-speed approach with
flaps in AUTO, and limit angle of bank to 20°. Pitch and directional damping will be very low and roll
coordination weak. If not positioned for landing by in the middle to in close, a wave-off and go-around
should be executed. A clean, lightly loaded aircraft exhibits the best flying qualities. Flying qualities
are not affected by CG locations, and the aircraft can be landed to the aft CG limit. An arrested landing
should be made if airspeed permits. Avoid stabilator braking.
A1-F18EA-NFM-000
IV-11-12 ORIGINAL
Level of AHRS
Channel Failure Indications Effects
One Channel Failure · Xs in one column (CAS P, CAS
R, CAS Y, N ACC, and L ACC)
· DEGD X
No effects on flying qualities.
Two Channel (incremental failure)
· Xs in two columns (CAS P, CAS
R, CAS Y, N ACC, and L ACC)
· DEGD X
Two channel (simultaneous failure
caused by loss of communication
between the two AHRS
channels and the FCCs)
· Xs in two columns (CAS P, CAS
R, CAS Y, N ACC, and L ACC)
· DEGD X
Three channel (detected and isolated)
· Xs in four columns (CAS P,
CAS R, CAS Y, N ACC, and L
ACC)
· DEGD X
· PCAS, RCAS, and YCAS cautions
Small degradation to the g-limiter
Three channel (detected but not
isolated)
· Xs in four columns (CAS P,
CAS R, CAS Y, N ACC, and L
ACC)
· DEGD X
· PCAS, RCAS, and YCAS cautions
· Poor roll coordination for large
lateral inputs
· Sluggish pitch response
· Pitch coupling
Three channel (not detected) · Xs in two columns (CAS P, CAS
R, CAS Y, N ACC, and L ACC)
· DEGD X
Four channel · Xs in four columns (CAS P,
CAS R, CAS Y, N ACC, and L
ACC)
· DEGD X
· PCAS, RCAS, and YCAS cautions
· Uncontrollable in flaps HALF
or FULL
· Poor roll coordination for large
lateral inputs
· Sluggish pitch response
· Pitch coupling
Figure 11-1. AHRS Channel Failure Indication and Effects
A1-F18EA-NFM-000
IV-11-13 (Reverse Blank) ORIGINAL
PART V
EMERGENCY PROCEDURES
Chapter 12 - General Emergencies
Chapter 13 - Ground Emergencies
Chapter 14 - Takeoff Emergencies
Chapter 15 - Inflight Emergencies
Chapter 16 - Landing Emergencies
Chapter 17 - Ejection
Chapter 18 - Immediate Action
A1-F18EA-NFM-000
61 (Reverse Blank) ORIGINAL
EMERGENCY INDEX
CHAPTERS 12 THRU 17
Page
No.
A
ABORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-14-2
AFTERBURNER FAILURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-15-1
ARRESTMENT - FIELD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-16-10
Arresting Gear Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-16-10
Arrestment - Long Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-16-11
Arrestment - Short Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-16-11
Arrestment Decision. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-16-11
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