No one should be allowed to show his work to any private person without first submitting it to the appointed assessors and to the Guardians of the Laws, and getting their approval
GLARESHIELD *EFIS CONTROL PANEL * BAROMETRIC REFERENCE .................................................SET | BOTH ‐ Set QNH on the EFIS control panel and on the standby altimeter ‐ Check the barometric reference and altitude indications on the PFDs and on the standby altimeter. The maximum difference is: ± 20 ft between both PFDs And depending on the aircraft configuration: ± 60 ft between ISIS and PFDs, or ± 300 ft between mechanical standby altimeter and PFDs.