During opening of an entry door from the interior, why do the upper and lower door gates fold inward before the door moves fully through the frame?, They reduce the effective size of the door, break the pressure seal and vent any remaining cabin differential pressure before the door is cocked open., They disengage the upper hinge lock so the door can rotate parallel to the fuselage., They unload the door stop fittings by moving cabin pressure loads back onto the latch rollers., Why are the entry-door latch mechanisms substantially unloaded once the airplane becomes pressurized?, The latch rollers retract slightly from the latch tracks as cabin pressure rises., Cabin pressure moves the door slightly outboard, causing the stop pins to seat against the frame pressure pads so pressure loads transfer through the stop fittings rather than the latch mechanisms., The upper and lower gates automatically move inward and transfer loads into the hinge torque tubes., An overwing emergency exit door is being opened while substantial cabin differential pressure still exists. What feature initially prevents normal handle movement?, The flight-lock solenoid mechanically disconnects the handle from the lock torque tube whenever any differential pressure exists., The counterbalance mechanism increases spring force in proportion to cabin differential pressure., The pressure vent panel resists handle movement until cabin pressure can vent sufficiently through the panel., The Mid Cabin Emergency Exit Door is being opened normally. Which motion sequence allows it to clear the fuselage pressure-stop fittings?, The door initially moves inward and upward, then rotates outward and downward to the open position., The door first moves directly outward, then rises vertically before rotating aft., The door initially moves downward and inboard before translating upward through the fuselage cutout., A cargo door is closed and latched while the aircraft is unpressurized. Which components principally hold the door closed, and how does this change after pressurization?, The stop pins hold the door closed in both conditions, while the latch rollers only operate the warning switch., The hinges carry the closing loads unpressurized, while the counterbalance carries pressure loads after pressurization., The overcenter latch mechanisms hold the door closed while unpressurized; after pressurization, the door moves outward slightly and pressure loads transfer through the stop pins and pressure pads., The forward equipment-compartment access door is closed, but its latch pin has not entered the frame boss. What indication should result?, The P5 EQUIP door warning light remains illuminated because the warning microswitch is not opened by the latch pin., The P5 FWD CARGO light illuminates because both doors use the same Proximity Switch Electronics Unit channel., No indication occurs until the aircraft becomes pressurized., The flight-compartment door lock system is powered and the door-lock switch is in AUTO. A valid emergency access code has been entered on the keypad. What happens if the flight crew subsequently selects DENY before the automatic unlock occurs?, The door unlocks immediately, but the keypad is disabled for the next access attempt., The pending access request is rejected and keypad operation is disabled for a period of time., The mechanical dead bolt automatically extends and can only be released with the passenger-compartment key., During rapid flight-compartment decompression, what causes the two flight-compartment-door decompression panels to open?, The electric door-lock solenoid releases both panels when the pressure sensor detects a rapid pressure change., A differential pressure of approximately 0.5 pounds per square inch differential releases the pressure-release latches, after which differential pressure pushes the panels open., The panels are mechanically linked to the dead bolt and open whenever the dead bolt retracts automatically., During normal forward-airstair retraction, why must the upper handrails be stowed and the lower ladder fully folded before the stair can move back through the door opening?, The handrail and lower-ladder safety switches form part of the K1 normal-relay control circuit and prevent continued retraction unless the stair is in a safe configuration., The 115-volt alternating-current normal motor cannot generate sufficient torque until the handrails are mechanically locked., The door-lock actuator remains energized until both handrails transmit a mechanical unlock force to the airstair carriage., Maintenance uses the S14 airstair maintenance switch because one of the retraction protection circuits is faulty. What is the significant effect of this action?, It permanently removes the handrail and lower-ladder interlocks until the next electrical power cycle., It transfers airstair operation from normal mode to standby mode and disables all limit switches., It creates a temporary bypass around the handrail and lower-ladder safety switches for one retraction cycle, requiring maintenance personnel to manually ensure the stair is correctly configured.

ATA 52

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