Pilot's Operating Handbook
Section 3
Emergency procedures
EASA Approved
Edition 0 - March 05, 2019
Rev. 0
Page 3.12.29
AHRS failure 1/2
Symptoms : Autopilot is disconnected
- On PFD(s) : Comparator window
HDG
and/or
PIT
and/or
ROL
annunciation(s),
- On PFD(s) : Reversionary sensor window
BOTH ON AHRS1 or BOTH ON AHRS2 annunciation.
Lost systems :
- AHRS1 or AHRS2,
- Autopi
lot (AP).
Systems still operative :
- Flight Director (FD), when engaged again,
- Autothrottle remains engaged or may be engaged.
Actions :
Autopilot is not operative.
1 - AHRS1 and/or AHRS2 breaker Check pushed. . . . . . . . . . . . . . . . . . . . . . . . .
If BOTH ON AHRS1 or BOTH ON AHRS2 annunciation is associated to
HDG and/or PIT and/or ROL
annunciation(s) :
2 - Fly the airplane manually.
If pilot wishes :
3 - FD default mode Engage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PIT and ROL
4 - FD specific modes Engaged as desired. . . . . . . . . . . . . . . . . . . .
HDG, NAV, ALT, …
5 - Fly the airplane manually to follow Command Bars.
End of pro
cedure ■
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