If environmental control limits are at risk during a leg, what action should be taken?

If environmental control limits are at risk during a leg, what action should be taken?

• A. Climb to a higher altitude to bypass limits
• B. Review and adjust cabin pressure, temperature, bleed air within AFM limits
• C. Cancel the flight
• D. Ignore and monitor later

Answer: (B)

Controlling the environmental control system to keep cabin pressure, temperature, and bleed air within the approved AFM limits. When environmental control limits are at risk on a leg, the correct action is to review and adjust the cabin pressure setpoint, cabin temperature, and bleed air supply within those limits. This keeps the ECS operating within the safe, required ranges so passengers and crew aren’t exposed to unsafe pressures or temperatures, and so equipment isn’t stressed. Climbing to a higher altitude to bypass limits isn’t a valid corrective method because altitude changes can affect differential pressure and pack operation and isn’t the prescribed way to manage these systems. Canceling the flight is only for situations where in-flight correction isn’t possible or safe, and ignoring the issue isn’t acceptable because it leaves a safety-critical parameter unresolved.

Controlling the environmental control system to keep cabin pressure, temperature, and bleed air within the approved AFM limits.

When environmental control limits are at risk on a leg, the correct action is to review and adjust the cabin pressure setpoint, cabin temperature, and bleed air supply within those limits. This keeps the ECS operating within the safe, required ranges so passengers and crew aren’t exposed to unsafe pressures or temperatures, and so equipment isn’t stressed. Climbing to a higher altitude to bypass limits isn’t a valid corrective method because altitude changes can affect differential pressure and pack operation and isn’t the prescribed way to manage these systems. Canceling the flight is only for situations where in-flight correction isn’t possible or safe, and ignoring the issue isn’t acceptable because it leaves a safety-critical parameter unresolved.