: Every commercial airline must provide a copy to its pilots, and in many regions, at least one physical copy must be permanently stored in the flight deck. Structure of the Boeing 737-800 QRH
The design of the QRH directly addresses human factors. Studies of aviation accidents reveal that under stress, pilots suffer from "attention narrowing" and "confirmation bias." The QRH counters this through three key features: boeing 737-800 qrh quick reference handbook
The Boeing 737-800 Quick Reference Handbook (QRH): A Pilot's Ultimate Guide : Every commercial airline must provide a copy