QRH 7.8 · Étape 26
Action is irreversible. Do this step only if both the captain’s and first officer’s primary attitude displays are failed.
26 IRS MODE selectors (both) → ATT
Maintain straight and level, constant airspeed flight until attitude displays recover (approximately 30 seconds). The primary attitude displays stay failed and the SET IRS HDG prompt on the POS INIT page is blank until the attitude mode alignment is complete.
Enter magnetic heading on the POS INIT page or on the overhead IRS display unit by selecting HDG/STS.
The MAP display is not available.
NOTE: Periodically enter updated heading on the POS INIT page or on the overhead IRS display unit by selecting HDG/STS.
Do not engage either autopilot.
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QRH officiel AILO-0902 (PDF)
Aide-mémoire formation. Le QRH papier/PDF Air Inuit fait toujours foi.