Specific Details

Read the passage and evaluate the statement below.

An aircraft pitot-static system measures air pressure to operate three primary flight instruments: the airspeed indicator, the altimeter, and the vertical speed indicator. Forward motion forces ambient air into the pitot tube, generating ram air pressure. To prevent icing at high altitudes, the pitot tube contains an internal electric heating element. Flush-mounted static ports located on the aircraft fuselage measure undisturbed atmospheric pressure. The airspeed indicator requires differential input from both the pitot tube and the static ports to determine velocity. In contrast, the altimeter and vertical speed indicator connect exclusively to the static ports and do not utilize ram air pressure. Pre-flight inspections require personnel to verify that moisture drain openings in the lines remain unobstructed.

Based on the passage, the vertical speed indicator relies on both ram air from the pitot tube and atmospheric pressure from the static ports.

On-Board Inert Gas Generating Systems (OBIGGS) protect military aircraft fuel tanks from explosion by replacing oxygen in the fuel tank ullage with inert nitrogen. Ambient air from the engine bleed system is first routed through an air separation module containing semi-permeable hollow fiber membranes. These membranes separate oxygen and water vapor from nitrogen molecules. The resulting nitrogen-enriched air is continuously discharged into the fuel tanks, maintaining oxygen concentration below nine percent. Because OBIGGS generates nitrogen continuously during flight, it eliminates the requirement for heavy liquid nitrogen storage dewars on board.

According to the passage, all of the following are true of the On-Board Inert Gas Generating System EXCEPT:

Read the following technical passage:

During routine servicing of aircraft liquid oxygen (LOX) converters, ground crew technicians must verify that the converter build-up coil is free of frost accumulation before flight. If external frost appears along the lower housing during stabilization, technicians must immediately depressurize the vent line to prevent cryogenic seal degradation. The system pressure gauge must stabilize between 285 and 305 psi within twelve minutes of closing the external fill valve. If stabilization takes longer than fifteen minutes, the relief valve assembly must be removed for ultrasonic cleaning.

Based on the passage, technicians must depressurize the vent line immediately if frost forms along the lower housing during stabilization.

Pneumatic de-icing boots are inflatable rubber membranes attached to the leading edges of aircraft wings and tail surfaces to remove accumulated structural ice. During flight in icing conditions, engine bleed air or an auxiliary pneumatic pump inflates these rubber bladders in rapid cycles. As the rubber expands outward, it cracks and breaks the bond of the brittle ice layer, allowing high-speed oncoming airflow to strip the ice away. The system then applies vacuum suction to deflate the boots completely flat against the wing to minimize aerodynamic drag. Flight crews must activate the system only after a measurable layer of ice forms, as inflating them prematurely can cause ice to bridge over the inflated boot without breaking off.

Based on the passage, which of the following statements about pneumatic de-icing boots is NOT accurate?

During monthly safety inspections of shipboard Emergency Escape Breathing Devices (EEBDs), damage control personnel must examine the pressure relief indicator disc. If the visual inspection gauge indicates a charge level below 2,800 pounds per square inch (psi), the unit must immediately be removed from the berthing compartment and tagged for depot overhaul. Additionally, the tamper-evident security seal on the clear casing must remain intact; any broken seal requires complete hydrostatic testing rather than simple cylinder recharging. Units that meet all pressure requirements are wiped with a dry lint-free cloth and returned to their designated bulkhead mounting bracket.

According to the passage, what procedure must be performed if the tamper-evident security seal is found broken?

Read the following technical passage:

Before operating portable reverse osmosis water purification units (ROWPU) in sub-freezing environments, technicians must activate the internal manifold heating jacket. If ambient temperatures fall below 25 degrees Fahrenheit, the chemical injection metering pump requires pre-heating for 15 minutes to prevent hypochlorite crystallization. Additionally, operators must ensure the high-pressure concentrate discharge valve is positioned open by three full rotations to avoid membrane burst during initial startup.

Based on the passage, complete the statement with the exact number or word specified in the text.

Hydraulic accumulators in military aircraft store pressurized fluid to dampen pressure surges and provide emergency power if primary engine-driven pumps fail. Most tactical aircraft use nitrogen-charged piston accumulators, where a floating piston physically separates hydraulic fluid from a pre-charged chamber of dry nitrogen gas. Because nitrogen is chemically inert and non-flammable, it eliminates the risk of diesel effect combustion under high-pressure compression. While hydraulic fluid volume varies with system demand, the mass of sealed nitrogen gas remains constant during normal operations. Routine maintenance inspections verify the accumulator's static pre-charge pressure using an external pressure gauge only when the hydraulic system is fully depressurized.

According to the passage, routine maintenance inspections verify the accumulator's static pre-charge pressure while the aircraft hydraulic system operates under full pressure.

Read the following technical passage:

During daily operation of shipboard centrifugal fuel oil purifiers, operators must monitor the operating water pressure to maintain the liquid seal. If the operating water pressure falls below 25 pounds per square inch (psi) during fuel separation, the sliding bowl bottom drops prematurely, discharging unprocessed fuel directly into the sludge collection tank. During initial startup flushes, the manual three-way operating valve must remain open for at least 15 seconds to verify full bowl closure before introducing raw fuel.

Based on the passage, a drop in operating water pressure below 25 psi during fuel separation causes the sliding bowl bottom to drop prematurely.

Sound-powered telephone systems provide critical emergency communication aboard naval vessels without relying on external electrical power. When a user speaks into the transmitter, acoustic sound waves vibrate a flexible diaphragm linked directly to a magnetic armature, generating weak electrical currents through electromagnetic induction. These self-generated electrical signals travel along dedicated, shielded two-wire circuits to the receivers of connected handsets. Because the system produces its own operating energy directly from voice vibrations, communication remains active even during complete shipboard electrical blackout. However, operational range is strictly limited compared to amplified networks, and having multiple talkers on the same circuit simultaneously diminishes audio clarity due to signal division.

According to the passage, which of the following is NOT true regarding sound-powered telephone systems?

Passage:
Nuclear submarines rely on regenerative carbon dioxide ($CO_2$) scrubbers to maintain breathable atmospheric conditions during prolonged submerged operations. Ambient air is drawn continuously through beds of solid amine resin, which chemically bind $CO_2$ molecules at room temperature. Once a resin bed becomes saturated, the system automatically redirects incoming airflow to an alternate bed and exposes the saturated resin to steam heat and a vacuum, venting the desorbed $CO_2$ gas directly into the surrounding seawater. This cyclical thermal desorption allows the amine resin to be reused indefinitely without consuming consumable chemical cartridges. In contrast, older non-regenerative systems required manual replacement of disposable lithium hydroxide ($LiOH$) canisters, which generated hazardous solid waste and occupied valuable storage space.

Statement: According to the passage, modern regenerative carbon dioxide scrubbers require consumable chemical cartridges that must be manually replaced when saturated.

During scheduled quarterly servicing of tactical quiet generator (TQG) sets, maintenance personnel must inspect the mechanical governor actuator linkage. Before adjusting the linkage turnbuckle, technicians must loosen the jam nuts on both rod ends and verify that the throttle lever rests fully against the low-idle stop screw. The linkage rod must be set to provide exactly 0.125 inches of free travel before engaging the governor spring arm. Applying excessive torque to the aluminum bellcrank during adjustment can distort the internal pivot bushing, leading to erratic engine surging.

According to the passage, what condition must technicians verify before adjusting the linkage turnbuckle?

Read the following passage about naval degaussing systems:

Naval degaussing systems counteract a ship's magnetic signature to prevent the detonation of magnetic influence sea mines. As a steel-hulled vessel moves through the Earth's magnetic field, its hull acquires permanent and induced magnetization. Degaussing installations consist of heavy electrical cables wrapped around interior compartments through which controlled direct current (DC) is passed. This current produces an opposing magnetic field that neutralizes the ship's overall magnetic field. Shipboard sensors continuously monitor local magnetic field variations and ship heading to automatically adjust coil currents. However, degaussing does not eliminate acoustic or thermal signatures, and it requires dedicated electrical power from shipboard generators rather than relying on natural hull dissipation.

Which factual assessment from the passage corresponds to each statement regarding the naval degaussing system?

Read the following technical passage:

High-altitude transport aircraft utilize catalytic ozone converters to decompose atmospheric ozone entering the environmental control system before it reaches the passenger cabin. The converter core is composed of a ceramic honeycomb matrix wash-coated with a noble metal catalyst, primarily palladium and platinum. At normal cruise altitudes, ambient bleed air passes through the matrix at temperatures exceeding 150 degrees Celsius. The catalytic reaction breaks down toxic ozone into diatomic oxygen without consuming the precious metal coating. If the core becomes contaminated with silicone vapors, the catalyst surface undergoes irreversible poisoning, requiring immediate solvent degreasing and ultrasonic bath cleaning to restore baseline efficiency.

Complete the statement below based directly on the explicit facts provided in the passage:

Reverse Osmosis Water Purification Units (ROWPU) provide potable water in field operations by filtering fresh, brackish, or saline water sources. Incoming raw water first undergoes chemical pretreatment with coagulants and passes through multimedia sand filters to eliminate suspended solids and turbidity. Next, cartridge filters capture finer particulate matter before high-pressure pumps force the water through semipermeable polyamide membranes that block dissolved salts, heavy metals, and biological pathogens. Treated water is subsequently chlorinated to maintain residual disinfection during storage. However, ROWPUs cannot treat water contaminated with petroleum products, as hydrocarbons rapidly degrade the reverse osmosis membranes.

According to the passage, which of the following statements about the ROWPU is NOT true?

During pre-deployment staging of armored vehicle launched bridge systems, technicians must carefully verify the hydraulic scissor arm mechanism. The secondary mechanical bypass valve must remain closed until hydraulic reservoir pressure stabilizes at 2,400 psi. If the ambient fluid temperature drops below 40°F, operators are required to cycle the auxiliary warm-up circuit for eight minutes before engaging the scissor release. Engaging the release mechanism prematurely can distort the internal bronze thrust bushings.

According to the passage, what must operators do if the hydraulic fluid temperature falls below 40°F before engaging the scissor release?

Steel ship hulls in saltwater environments are highly vulnerable to galvanic corrosion caused by electrochemical reactions between dissimilar metals. To protect the primary steel structure, sacrificial anodes made of zinc or aluminum alloys are mounted directly to the hull below the waterline. Because zinc has a lower electrochemical potential than steel, the zinc anode oxidizes preferentially, corroding away while the steel hull remains protected as the cathode. Sacrificial anodes require zero external electrical power to function and are routinely inspected during drydock servicing. Technicians schedule replacement when an anode is depleted by approximately 50 percent of its original mass.

According to the passage, all of the following statements regarding sacrificial zinc anodes are true EXCEPT:

Passage:
Submarine atmospheric monitoring systems employ catalytic burner units to eliminate trace hydrogen gas generated by lead-acid battery banks. Ambient air drawn into the burner assembly first passes through an activated charcoal filter to capture volatile organic contaminants that could poison the catalyst. The filtered air stream then enters the preheater chamber, where electric heating elements raise the sample temperature to exactly 280°C before it reaches the precious-metal catalyst bed. Once oxidized into water vapor, the treated air flows through a secondary heat exchanger that lowers the discharge temperature below 45°C prior to releasing the stream back into the ventilation ductwork.

Statement: According to the passage, electric heating elements in the preheater chamber raise the air sample temperature to 280°C prior to reaching the catalyst bed.

Read the following technical passage:

During pre-flight pressure testing of an aircraft's pitot-static system, technicians connect a calibrated field test set to the fuselage pitot probe adapter. To prevent rupture of the internal airspeed indicator diaphragms, the pitot line pressure must not exceed 25 inches of water before the static equalization valve is opened. If the test set displays an unexpected differential pressure spike, the technician must immediately vent the pneumatic manifold using the manual dump valve rather than cycling the electrical pump switch. This ensures that moisture and pressurized air escape without straining the sensitive aneroid wafers.

According to the passage, what action must a technician take if an unexpected differential pressure spike occurs?

Read the following technical passage about aircraft emergency systems:

A Ram Air Turbine (RAT) is an emergency power source installed on modern military and commercial aircraft. In the event of total engine failure or primary electrical and hydraulic loss, the RAT automatically deploys into the airstream from a compartment in the fuselage or wing. As oncoming airflow spins its multi-blade propeller, the turbine directly drives a dedicated hydraulic pump, an electrical generator, or both. The RAT is governed to operate only when the aircraft maintains a minimum airspeed to ensure sufficient rotational speed. Because it derives its kinetic energy strictly from forward motion, it cannot generate power while the aircraft is stationary on the ground. Once deployed in flight, standard RAT systems cannot be retracted from the cockpit and must be manually reset by ground maintenance personnel after landing.

Match each statement regarding Ram Air Turbine (RAT) operation with its factual status according to the passage.

Read the following technical passage and fill in the blanks with the exact details explicitly stated in the text.