Directs the PM to flip the "STAB TRIM CUTOUT" switches to cutout, mechanically cutting power to the trim motor. The QRH then guides the crew on how to manually trim the aircraft using the mechanical trim wheels. Scenario B: Engine Fire or Severe Damage
In normal operations, we follow standard flows and checklists from memory or the Normal Procedures checklist. But when an amber caution light illuminates or a Master Warning sounds, the QRH takes over. It is designed for non-normal operations . It strips away the fluff and gives pilots the exact steps needed to stabilize the aircraft when seconds count.
Pilots do not guess what to do. They open the QRH and follow the exact words. This keeps the flight safe. How the QRH is Built
Engine Fire, Cabin Altitude Warning/Rapid Depressurization, Aborted Engine Start, Runaway Stabilizer. Reference Items boeing 737-800 qrh quick reference handbook
Electronic performance tools can automatically calculate landing data based on the QRH, reducing human error.
: This chapter covers issues that do not trigger a specific warning light, such as fuel leaks or ditching.
After securing the engine, you turn to the Performance section. You look up "Landing Distance – Single Engine." You find you need 2,500 meters plus a wind factor. You check your destination runway length. Only then do you decide to land or divert. Directs the PM to flip the "STAB TRIM
The bulk of the QRH is organized by system chapters, matching the standard ATA chapters used in aviation: Air Systems (Air Conditioning, Pressurization) Chapter 2: Anti-Ice, Rain Chapter 3: Autoflight Chapter 4: APU (Auxiliary Power Unit) Chapter 5: Communications Chapter 6: Electrical Chapter 7: Engines, APU Chapter 8: Fire Protection Chapter 9: Flight Controls Chapter 10: Flight Instruments Chapter 11: Flight Management, Navigation Chapter 12: Fuel Chapter 13: Hydraulics Chapter 14: Landing Gear Chapter 15: Warning Systems 3. Performance Inflight (PI) Section
While the paper QRH is iconic, technology is evolving. The "Boeing Interactive QRH" (IQRH) is an official iPad application for operators with a data subscription. It provides instant updates, eliminates revisions, and links directly to relevant performance calculations. However, it's important to note that these apps are replacements for the official, regulatory-approved paper copy required for dispatch; they serve as supplements or the primary approved EFB medium for airlines that have secured regulatory approval.
Located at the back of the handbook, the PI section contains critical data tables for non-normal configurations. If a 737-800 suffers a hydraulic failure and must land with a non-standard flap setting, the pilot uses this section to calculate the exact landing distance required based on weight, weather, and runway conditions. Types of Checklists: Memory Items vs. Reference Items But when an amber caution light illuminates or
The crew executes the memory items first. Once the aircraft trajectory is stabilized, the Pilot Flying (PF) will command: "QRH [Checklist Name] Checklist." Phase 2: Reference Checklists
The QRH is divided into logical sections to ensure quick navigation. While specific airline operators may customize their checklists, the standard Boeing 737-800 QRH typically includes: 1. Introduction and General Procedures
Located on the front cover or first few pages, this index lists time-critical emergencies in bold, enlarged font
