Repaso Semana 3 ATA 35

What is the capacity and nominal pressure of the crew oxygen cylinder?. 115 cubic feet of oxygen at a pressure of 2500 psi. 115 cubic feet of oxygen at a pressure of 1850 psi. 100 cubic feet of oxygen at a pressure of 1850 psi.

Where is the crew oxygen cylinder located in the airplane?. In the forward cargo compartment next to the bulk cargo area. Right side of the MEC, aft of the E3 rack and the access ladder. Left side of the MEC, forward of the E3 rack and the access ladder.

What occurs when cylinder pressure exceeds the safe limits of 2500–2750 psi?. The bleed valve opens for 25 seconds to relieve the excess pressure. The pressure regulator automatically reduces the value to 70 psi. The frangible disc ruptures and oxygen is discharged overboard.

To what pressure does the high-pressure regulator reduce oxygen for the masks?. The regulator reduces cylinder pressure down to a value of 100 psi. The regulator reduces cylinder pressure down to a value of 70 psi. The regulator reduces cylinder pressure down to a value of 50 psi.

Under which conditions does the bleed valve operate once after landing?. Airplane on ground, both engines off, and an engine is started. Airplane in flight, cabin altitude above 13 500 ft and airspeed >80 kt. Airplane on ground, one engine running, and the cylinder valve is closed.

Which system energizes the bleed-valve solenoid for 25 s on B777-300/300ER/200LR?. The AIMS system supplies the 25-second electrical pulse to the solenoid. The CCA system supplies the 25-second electrical pulse to the solenoid. The ELMS system supplies the 25-second electrical pulse to the solenoid.

With what resolution is crew oxygen pressure displayed on the STATUS page?. It is displayed in psi units rounded to the nearest 50 psi. It is displayed in psi units rounded to the nearest 10 psi. It is displayed in psi units with an exact resolution of 1 psi.

Which component absorbs the heat generated when high-pressure oxygen fills a line?. The pressure regulator installed adjacent to the oxygen cylinder. The pressure transducer installed adjacent to the oxygen cylinder. The thermal compensator installed adjacent to the oxygen cylinder.

If the green disc of the overboard discharge indicator is missing, what must be checked?. Whether the bleed valve remains open after the landing cycle. Whether the crew oxygen cylinder is empty. Whether the pressure regulator is correctly maintaining 70 psi.

With the diluter/demand control set to N (Normal), how is oxygen supplied?. Automatic pressure breathing from the moment the airplane takes off. Mixture of oxygen and cabin air according to altitude; 100 % above a preset threshold. Continuous flow of 100 % oxygen regardless of cabin pressure altitude.

How is the oxygen shutoff valve of the crew stowage box closed?. Automatically two minutes after the airplane has landed. By closing the left-hand door and pushing the reset/test lever. By closing only the right-hand door of the mask stowage box.

What signal does the oxygen shutoff valve/indicator send to the audio management unit?. A flow-indication signal sent to AIMS for display on the STATUS page. A CREW OXYGEN LOW signal to trigger the corresponding EICAS advisory. An oxygen ON signal that activates the microphone mounted in the mask.

What two conditions are required for automatic deployment of passenger oxygen masks?. Airplane in flight at >80 kt and cabin altitude above 13 500 ft (4115 m). Only cabin altitude above 13 500 ft, independent of airplane airspeed. Cabin altitude above 10 000 ft and airplane airspeed greater than 80 knots.

For how long does the ELMS hold the ground on the oxygen deployment relays?. The ELMS holds the ground for a period of 15 seconds. The ELMS holds the ground for a period of 2 minutes. The ELMS holds the ground for a period of 25 seconds.

Which system cancels the “oxygen on” signal approximately two minutes after landing?. The ELMS system cancels the oxygen-on signal two minutes after landing. The OPAS system cancels the oxygen-on signal two minutes after landing. The AIMS system cancels the oxygen-on signal two minutes after landing.

How many chemical generators are fitted in center PSUs that supply more than three seats?. Three chemical oxygen generators are installed in the center PSU. Two chemical oxygen generators are installed in the center PSU. A single chemical oxygen generator is installed in the center PSU.

How many oxygen masks are contained in a lavatory oxygen box?. The lavatory oxygen box contains one more mask than the number of seats. The lavatory oxygen box contains exactly two oxygen masks. The lavatory oxygen box contains only one oxygen mask.

If the 22-minute generator release cable is routed through the 12-minute hole on a center PSU (B777-300/300ER), what happens?. The PASS OXYGEN LOW message is generated on the airplane EICAS. The generator fires automatically when the oxygen-box door is opened. The cable binds when the mask is pulled and the generator will not fire.

What is the primary function of the door latch/actuator on passenger oxygen boxes?. To provide a visual indication of oxygen flow to the passenger masks. To keep the door closed and release it when the electrical coil is energized. To regulate the oxygen flow delivered to the masks at a pressure of 70 psi.

What special design feature does the hinge of the door-one-left lavatory mask box have?. The hinge incorporates an additional frangible disc for over-pressure protection. The hinge opens upward to allow easy access to the chemical generator. The hinge separates on release so the door hangs on lanyards without interference.

Which EICAS message appears when PASS OXYGEN is set to ON, and when does the switch return to OFF?. CREW OXYGEN LOW – the switch automatically returns to OFF after 25 seconds. PASS OXYGEN LOW – the switch remains ON until a manual reset is performed. PASS OXYGEN ON – the switch automatically returns to OFF after approximately 2 minutes.

On which panel is the PASS OXYGEN switch located?. On the captain’s stowage box next to the mask reset/test lever. On the P5 overhead panel (Window Heat / Emergency Lights) in the flight deck. On the display select panel (DSP) of the flight-deck center pedestal.

The pressure transducer sends cylinder-pressure data to AIMS only when: Cabin altitude exceeds 13 500 ft and airspeed is greater than 80 kt. The cylinder shutoff valve is open. The bleed valve is open during its 25-second operating cycle.

Which three high-pressure distribution components are located adjacent to the cylinder?. Pressure transducer, pressure regulator and thermal compensator. Door latch/actuator, chemical oxygen generator and distribution manifold. Bleed valve, frangible disc and overboard discharge indicator.

If the left door of the stowage box is closed without pushing the reset/test lever, what is observed?. The CREW OXYGEN LOW message is generated on the STATUS page. The flow indicator shows continuous oxygen flow toward the mask. The oxygen-on indicator remains visible on the front of the stowage box.

What crew-oxygen pressure value is shown as an example on the STATUS page in the manual?. The STATUS-page example shows a pressure value of 70 psi. The STATUS-page example shows a pressure value of 1850 psi. The STATUS-page example shows a pressure value of 500 psi.

What does the manual state regarding the total quantity of passenger oxygen masks?. The total number of masks is exactly two masks for every installed PSU. The total number of masks is greater than the number of passenger and attendant seats. The total number of masks equals the number of passenger and attendant seats.

What events does the CMS/CSS generate in the passenger cabin when oxygen is deployed?. Automatic opening of all emergency exits in the passenger cabin. Only the generation of the corresponding advisory message on EICAS. Aural alert, cabin lights to bright, NS/FSB signs ON, and PA volume to maximum.

Of what material is the crew oxygen cylinder manufactured according to the manual?. The crew oxygen cylinder is manufactured from an aluminum alloy. The crew oxygen cylinder is manufactured from composite materials. The crew oxygen cylinder is manufactured from high-strength steel.

The movable retainer ring of the cylinder support has two positions. What is their purpose?. One position for 1850 psi service and another position for 2500 psi service. One position for a composite cylinder and another position for a steel cylinder. One position for the B777-200 model and another position for the B777-300 model.

Where is the overboard discharge indicator of the crew oxygen system located?. On the left side of the MEC, next to the cylinder and thermal compensator. On the right side of the nose landing gear wheel well, on the airplane skin. On the left side of the nose landing gear wheel well, on the airplane skin.

During the stowage-box test, what should the flow indicator show?. Continuous flow with reset/test only; momentary flow when both controls are pressed. Momentary flow in both cases, regardless of which controls are actuated. Momentary flow with reset/test only; continuous flow when both controls are pressed.