The Boeing 737-800 QRH is a mission-critical, time-sensitive reference for managing abnormal and emergency conditions. It is organized by color-coded tabs, prioritizes memory items, provides performance data, and is designed for rapid access in the flight deck environment. Operators supplement the QRH with company-specific procedures but cannot modify Boeing-published non-normal steps without regulatory approval.

This is the bulk of the book. Organized by system (Pneumatics, Electrical, Flight Controls), you only turn to this section after completing memory items. Examples include:

The QRH provides graphs & tables for:

The 737-800 is an incredibly reliable aircraft, but its "legacy" design (first certified in 1997) lacks the full automation of the 787. The QRH bridges that gap. It turns a complex, dual-engine failure into a simple 7-step checklist.

During the famous "Miracle on the Hudson" (though an A320), pilots later praised the QRH logic. On a 737, if you lose both engines, the QRH has a dedicated checklist that leads you directly to the Rapid Decompression & Engine Failure procedure—allowing you to focus on gliding, not panicking.