PILOT’S OPERATING HANDBOOK
SECTION 3
EMERGENCY PROCEDURES
EASA Approved
Edition 0 -- October 31, 2013
Rev. 1
Page 3.9.12
AHRS FAILURE
Symptoms : Autopilot is disconnected
-
On PFD(S) : COMPARATOR WINDOW (WHITE ANNUNCIATION) :
HDG NO COMP
and/or
PIT NO COMP
and/or
ROL NO COMP
-
On PFD(S) : REVERSIONARY SENSOR WINDOW (YELLOW ANNUNCIATION) :
BOTH ON AHRS1
or
BOTH ON AHRS2
Lost systems :
-
AHRS1 or AHRS2
-
AUTOPILOT (AP)
Systems still operative :
-
FLIGHT DIRECTOR (FD), when engaged again
Actions : AUTOPILOT IS NOT OPERATIVE
1 - AHRS1 and/or AHRS2 circuit breaker
CHECKED ”IN”
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A - If yellow annunciation
BOTH ON AHRS1
or
BOTH ON AHRS2
is associated to white annunciation
HDG NO COMP
and/or
PIT NO COMP
and/or
ROL NO COMP
:
1 - Fly the airplane manually
2 - AHRS1 and/or AHRS2 circuit breaker
CHECKED ”IN”
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
If pilot wishes :
3 - ”FD” (default mode : ”PITCH” and ROLL”)
ENGAGED
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 - ”FD” (specifics modes : ”HDG”, ”NAV”, ”ALT”, …)
ENGAGED as DESIRED
. . . . . . . . . . .
5 - Fly the airplane manually to follow Command Bars
If
ALL
white
annunciations,
(
HDG NO COMP
and/or
PIT NO COMP
and/or
ROL NO COMP
), go ”OFF”, refer to following ”B” procedure.
B - If yellow annunciation
BOTH ON AHRS1
or
BOTH ON AHRS2
ONLY (not associated to white
annunciation
HDG NO COMP
and/or
PIT NO COMP
and/or
ROL NO COMP
) :
1 - PFD1 and PFD2 ”SENSOR” softkey’s
PRESSED
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 - AHRS1 on PFD1 and/or AHRS2 on PFD2
RESET
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 -
BOTH ON AHRS1
or
BOTH ON AHRS2
annunciation – OFF
CHECKED
. . . . . . . . . .
4 - Autopilot
NORMAL USE (as desired)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .