Crew Coordination, Systems Management, and Aerodynamic/Engine-Related Decisions
This domain tests the judgment layer: who flies, who monitors, how automation is used, and how aerodynamic and engine limits shape decisions at altitude and during asymmetric flight.
Crew coordination and monitoring
- The sterile flight deck rule (14 CFR 121.542) bars nonessential conversation and activity during critical phases of flight - taxi, takeoff, and landing, and all operations below 10,000 ft.
- Use clear challenge-response callouts, a takeoff and approach briefing that assigns who calls what, and explicit transfer of aircraft control.
- The pilot monitoring watches flight path, speed trend, and engine parameters; the pilot flying flies. Announce deviations early rather than correcting silently.
Aerodynamic and engine decisions
- Approaching high-altitude cruise, low-speed stall buffet and high-speed Mach buffet converge - the coffin corner. Maneuver margin, not just thrust, sets the ceiling.
- Mach buffet at high speed calls for reduced thrust and a slower target speed; a descent may be required. Exceeding Mmo risks Mach tuck and control loss.
- Asymmetric thrust near Vmc demands rudder, reduced power on the live engine, and prompt feathering; yaw damper use does not substitute for rudder discipline.
- Engine limits drive decisions: a high ITT may require a lower cruise thrust setting even if N1 looks normal.
Worked example
Cruising at FL410, Mach 0.80, you feel light buffet and the Mach trend is rising. The margin between low- and high-speed buffet is small at that altitude, so the correct response is to reduce thrust, hold altitude momentarily to slow, restore a comfortable margin, and descend to a lower level if the buffet persists. Pushing over or adding power to "climb out of it" narrows the margin further.
Traps
Treating the yaw damper as an autopilot; letting the monitoring pilot become a passenger; delaying the control transfer callout; ignoring an ITT trend because N1 is on target; briefing the approach after top of descent instead of before.