The active IASC loses its ability to control its associated pack temperature and flow. What capability is specifically designed into the system to maintain pack control?, The ACAU assumes direct closed-loop temperature control of the failed pack, The opposite IASC can provide automatic standby temperature and flow control, The standby temperature control valve independently assumes full pack flow and temperature control, During cruise with the flaps up, the inlet SRADA fails and remains at a fixed position. What response is commanded to reduce the likelihood of a pack overtemperature shutdown?, The exit SRADA drives the exit louvers fully closed, The exit SRADA drives the exit louvers to 100% open, The inlet modulation panels are commanded to 40% while the exit louvers remain fixed, Why is water extracted from the conditioned-air stream subsequently routed back to the ram-air duct?, To increase compressor inlet humidity and reduce ACM rotational speed, To provide evaporative cooling of the ram-air stream and improve heat-exchanger cooling, To prevent ice formation by warming the secondary heat-exchanger surface, A pack overheat occurs with the PACK switch in AUTO. Which sequence most accurately describes the protection response?, K8 energizes, the FCSOV closes, the TCV closes, and the trip remains latched until the overheat condition clears and TRIP RESET is selected, K17 energizes, the FCSOV remains open at low flow, and the TCV drives fully cold until the overheat clears, K8 de-energizes, the FCSOV closes mechanically, and the pack automatically resets when temperature falls below the switch threshold, During unpressurized flight, why can recirculation-fan operation remain important even though normal fresh-air pack supply is unavailable?, The fans maintain airflow to occupants by recirculating cabin air, The fans create sufficient pressure to replace pack airflow for cabin pressurization, The fans supply cooling air directly to the air-cycle machine heat exchangers, The primary flight-compartment zone temperature-control channel fails BITE. What is the immediate system reconfiguration?, The flight-compartment ZTAMV closes and the pack automatically changes to unbalanced average mode, Both IASCs stop trim-air control and the left pack controls all three temperature zones, The left IASC backup flight-compartment control channel assumes control of the ZTAMV, The trim-air system becomes unavailable. In unbalanced coolest-demand mode, how are the two pack outlet temperatures allocated?, Both packs supply the average temperature demanded by all three zones, The left pack serves flight-compartment demand while the right pack supplies the coolest demand of the two passenger zones, The right pack serves flight-compartment demand while the left pack supplies the average passenger-zone demand, Equipment-cooling smoke is detected and smoke-clearance logic energizes the supply-system interrupt relay. Why is a delayed purge sequence used before normal smoke detection is restored?, To clear residual smoke particles from the duct without immediately generating another smoke warning, To allow both supply fans to operate simultaneously and cool the detector, To allow the overboard exhaust valve to repressurize the EE compartment before restoring airflow, What feature makes the complete cabin pressurization control architecture effectively triple redundant rather than simply dual redundant?, Two CPCs control two independent outflow valves plus a common backup valve, Each CPC has three separate cabin-pressure sensors supplied from different electrical buses, Two automatic CPC/motor channels are supplemented by an independent manual motor system that bypasses both CPCs, During normal pressurization, both automatic CPC systems fail. Which indication distinguishes this condition from a single automatic-controller failure?, AUTO FAIL illuminates, the FLT ALT and LAND ALT displays show dashes, and the ALTN light does not illuminate, AUTO FAIL and ALTN remain illuminated, showing the remaining standby controller is operating, MANUAL automatically illuminates and the manual outflow-valve motor assumes control

ATA 21

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