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Page 49
Sub-section - 4.05
ABNORMAL PROCEDURES
FAA Approved
Original Issue: Feb 28, 2006
Hawker 850XP Pro Line 21 Airplane Flight Manual
COMPARATORS
(continued)
No Compare Annunciators
No Compare annunciators are displayed on the PFD when compared parameters are valid, but
no valid data is being received from a second source allowing the comparators to function.
No Compare annunciators are displayed in white, flash for 5 seconds initially and then remain
illuminated. They are extinguished when the No Compare condition is removed.
No in-flight action is required.
Crosstalk Fail
A yellow boxed XTLK flag appears above the location of the ATT and IAS comparator flags on
the PFD, and equivalent MFD location when applicable, when any flight display loses crosstalk
input from any other PFD or MFD. The yellow boxed XTLK will be removed when communication
is restored.
Displays that have been deselected by pilot reversion will not cause the yellow boxed XTLK flag
to come into view.
Comparator Function
No Compare
Annunciations
Heading
XAHS
Pitch
XAHS
Roll
XAHS
Pitch and Roll
XAHS
Altitude
XADC
Airspeed
XADC
Left N
1
or N
2
or ITT
ENG 1
Right N
1
or N
2
or ITT
ENG 2
For Training Purposes Only