Vol 2. Aircrew Personal Protective Equipment

The density of the atmosphere rises and falls due to changes in altitude. As altitude increases, the atmospheric pressure decreases, causing the air molecules to spread out and resulting in lower density. Conversely, at lower altitudes, the atmospheric pressure increases, causing the air molecules to compress and resulting in higher density. Therefore, altitude is the main factor that causes variations in the density of the atmosphere.

Chicken wire is a term used to describe an irregular pattern of dark thin lines that can appear in the field of view of night vision goggles. This visual defect is caused by the design of the image intensifier tube in the goggles, which consists of a grid-like structure resembling chicken wire. This grid pattern can sometimes be visible in the image produced by the goggles, creating the appearance of dark thin lines.

Aircrew laser eye protection (ALEP) devices are fitted as close to the face as possible to maximize the area of protected vision. By placing the devices close to the face, they can provide a wider coverage and protect the eyes from laser beams coming from various angles. This positioning ensures that the eyes are shielded effectively and minimizes the risk of any exposure to harmful laser radiation.

The purpose of the aircrew contamination control area (ACCA) is to provide detection, contamination control, and processing provisions for aircrew members. This means that the ACCA is designed to detect any potential contamination, provide measures to control and mitigate the contamination, and also offer facilities for processing and decontamination of the aircrew members if necessary. It is a dedicated area that ensures the safety and well-being of the aircrew members by addressing any potential contamination risks they may encounter.

A gradient visor assembly is a light weight visor assembly used on the HGU-55 series helmet that has a viscosity from 25 to 15 percent color shade. This means that the visor has a gradual transition of color, starting from 25 percent shade at one end and gradually decreasing to 15 percent shade at the other end. This allows for better visibility and protection against varying light conditions, as the visor can adapt to different levels of brightness.

Prior to selecting an HGU-55/P helmet size for fitting, the measurements taken of the aircrew member's head include head length and breadth. These measurements are essential in determining the appropriate helmet size that will provide a comfortable and secure fit for the aircrew member.

Two lens stops are used to prevent the lightweight visor assembly from rotating off the back of the HGU-55P helmet shell. These stops act as barriers, limiting the movement of the visor assembly and ensuring that it stays securely in place. The lens stops are designed to provide stability and prevent any unwanted rotation or displacement of the visor assembly during use.

The correct answer is weight and height. In order to properly size the CSU-13 series anti-G garment for an aircrew member, it is necessary to know their weight and height. This information is crucial for ensuring that the garment fits the individual correctly and provides the necessary protection against the effects of high G-forces. Waist and thigh measurements, chest circumference, and waist and stature measurements are not directly relevant to determining the appropriate size of the anti-G garment.

The correct answer states that the leak check of the Aircrew Eye/Respiratory Protection (AERP) system should be completed any time the AEPR is repaired or disassembled or during annual inspection. This means that the leak check should be conducted whenever there is a repair or disassembly of the system, as well as during the annual inspection. This ensures that any potential leaks in the system are identified and addressed, maintaining the effectiveness and safety of the AERP system.

When aircrew members enter area 4, they are required to remove their respiratory protection for the first time. This can present the greatest danger of contact contamination hazard because without respiratory protection, they are exposed to any potential airborne contaminants in the area. The removal of respiratory protection for the first time increases the risk of inhaling hazardous substances, making it the most dangerous aspect in this situation.

The Scott 358 series folding quick don mask assembly is secured to the wearer's face with spring loaded telescopic mounts on the suspension assembly. These mounts provide a secure and adjustable fit, allowing the mask to be comfortably worn by the wearer. The spring loaded feature ensures that the mask stays in place during use and can be easily adjusted as needed. This method of securing the mask to the face is effective and reliable, making it a suitable choice for the Scott 358 series mask.

The viewing window of the protective breathing equipment (PBE) turning pink indicates that it is unserviceable. The color change is likely due to a chemical reaction or damage to the equipment, indicating that it may not provide the necessary protection in emergency situations. The moisture indicator readings do not necessarily indicate the serviceability of the PBE, so they are not the correct answer.

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The correct answer is 180 days because a periodic inspection is done every 180 days on the CWU-74/P anti-exposure suit.

The pressure exerted by the atmosphere at high altitudes is greater near the surface of the earth. This is because the weight of the air above exerts a force on the air below, creating higher pressure at lower altitudes. As altitude increases, the weight of the air above decreases, resulting in lower pressure. Therefore, the pressure is greatest near the surface of the earth and decreases as you move higher in altitude.

The correct answer is Type IVB, 8/4 double-waxed. This type of thread is used to tack the buckles on the MBU-12/P strap and buckle assembly to prevent movement. The double-waxed coating provides added durability and strength to the thread, making it suitable for securing the buckles tightly in place.

The correct answer is 17½ inches. The length of the MBU-12/P oxygen mask hose is 17½ inches.

The CSU-13 B/P anti-G garment bladders are made of polyurethane-coated taffeta cloth. This material is used because it provides a combination of strength, durability, and flexibility. The polyurethane coating adds water resistance and helps to protect the bladders from damage. Taffeta cloth is lightweight and breathable, making it comfortable for the wearer. Overall, the polyurethane-coated taffeta cloth is the ideal choice for constructing the bladders of the CSU-13 B/P anti-G garment.

A 7 watt light bulb is used for a night vision goggle (NVG) test lane because it provides a sufficient amount of light without being too bright. Night vision goggles amplify existing light, so using a higher wattage bulb could potentially overwhelm the goggles and cause them to not function properly. A 7 watt bulb strikes a balance between providing enough light for testing purposes while still being compatible with the night vision technology.

The correct answer is to bring the EPOS seal down around the infant's waist. This provides protection to the infant by ensuring that the oxygen is properly sealed around their body, allowing them to breathe safely in an emergency situation. Bringing the seal down around the waist ensures a secure fit and prevents any leakage of oxygen.

The tilt adjustment control on the AN/AVS-9(V) binocular assembly is used to adjust the line of sight. This control allows the user to tilt the binoculars up or down, aligning the line of sight with the desired target. By adjusting the tilt, the user can ensure that the binoculars are properly aligned and provide an accurate view of the target.

A solution of a mild detergent and water is not used for decontamination of equipment in the field. While mild detergent and water can be used for general cleaning purposes, it is not effective for decontamination as it does not have the necessary disinfecting properties. The M-291 and M-295 decontamination kits, on the other hand, are specifically designed for decontamination purposes. Clorox bleach, with its 5 percent chlorine solution, is a strong disinfectant and can be used for effective decontamination.

The Zetaliner comes in 4 different thicknesses.

The correct answer is 35,000 feet. The demand oxygen system is designed to provide enough oxygen for flights up to this altitude. This system ensures that the crew and passengers have an adequate oxygen supply to breathe at higher altitudes where the air is thinner and oxygen levels are lower.

The straps of the MBU-12/P oxygen mask are attached using a capped T-nut and a self-locking screw. This method ensures a secure and reliable attachment of the straps to the mask, preventing them from coming loose during use. The capped T-nut provides stability and support, while the self-locking screw ensures that the straps remain securely fastened. This attachment mechanism is designed to withstand the rigors of use in high-pressure oxygen environments, making it a suitable choice for the MBU-12/P oxygen mask.

The CRU-60/P oxygen connector is a three-way manifold block. This means that it has three openings or ports that allow for the connection of different oxygen devices or components. This type of manifold block is commonly used in medical settings where multiple oxygen sources or devices need to be connected or controlled simultaneously.

The purpose of the CSU-17/P vest assembly in COMBAT EDGE is to provide chest counter pressure during pressure breathing for Gs (PBG). This means that the vest assembly helps to maintain the proper pressure in the chest during high-G maneuvers, which is necessary for the pilot to continue breathing effectively and prevent loss of consciousness. The vest assembly does not inflate the G-suit, hold survival items, or provide a life preserver.

The correct answer is 13+-1 inch pounds. This means that a torque value of 13 inch pounds should be applied to the helmet's integrated chin and nape straps (ICNS) screws, with a tolerance of plus or minus 1 inch pound. This ensures that the screws are tightened to the appropriate level, providing secure fastening without being too loose or too tight.

The maximum permissible oxygen leakage per minute in the CRU-60/P oxygen regulator connector is 0.25 liter. This means that any leakage beyond this amount would not be considered acceptable. It is important to ensure that the connector is properly sealed to prevent any excess oxygen leakage, as it could lead to potential safety hazards.

There are two ways to provide sufficient pressure in the lungs. One way is through the natural process of breathing, where the diaphragm and intercostal muscles contract to expand the lungs, creating a pressure difference that allows air to flow in. The second way is through artificial means such as using a mechanical ventilator, which delivers pressurized air into the lungs to assist with breathing.

The correct answer is 95. The field of view (FOV) for the AN/AVS-10(V) Panoramic Night Vision Goggles (PNVG) is 95 degrees horizontal. This means that when wearing these goggles, the user can see a wide range of their surroundings, spanning almost 100 degrees from left to right. This wide FOV allows for enhanced situational awareness and improved visibility in low-light conditions.

The interpupillary distance (IPD) adjustment control on the AN/AVS-9(V) night vision goggles allows for adjusting the distance between the eyes. The question asks for the widest eye span setting that can be made using the IPD. The correct answer is 72mm, indicating that the IPD adjustment control can be set to a maximum width of 72mm, providing a wider eye span for the user.

The HGU-55 series helmet must be modified when used with COMBAT EDGE equipment to provide for automatic mask tensioning. This modification is necessary because the thermo plastic liner cannot be used with this helmet. The automatic mask tensioning feature ensures a secure and comfortable fit of the mask, enhancing the overall effectiveness and safety of the equipment.

When setting up an aircrew contamination control area (ACCA), it is important to establish the processing direction at a 45 to 60º deviation (angle) towards the wind direction. This is because setting up the processing direction towards the wind helps to ensure that any contaminants or hazardous materials are blown away from the area where the aircrew is working. By positioning the processing direction in this manner, the wind will carry any potential contaminants away from the aircrew, reducing the risk of contamination and ensuring a safer working environment.

The correct answer for this question is a pres-to-test actuator. The pres-to-test actuator is located on the external frame assembly of the EEU-2/P goggles and allows for a self-check of the goggles' operation. This actuator is used to initiate a self-test function that checks the functionality of the goggles, ensuring that they are working properly. It is an important feature that allows users to verify the operational status of the goggles before use.

The air hose on the CSU-23/P antigravity suit is located on the right side.

The tear-away pull tabs of the Aircrew Eye/Respiratory Protection (AERP) should be positioned under the lower harness straps during wear. This placement ensures that the tabs are securely held in place and easily accessible for quick removal if needed. Placing them over the lower harness straps or on top of the nose bridge may hinder their functionality and make it more difficult to remove the AERP in case of an emergency. Therefore, positioning the tear-away pull tabs under the lower harness straps is the correct and recommended method.

The pilots are not authorized to use the high-contrast visor (HCV) on the HGU-55/P series flyer's helmet in the T-6A aircraft.

The EPOS contains one oxygen cylinder filled with 18 liters of aviator oxygen.

The HGU-56/P helmet is constructed of graphite and polyethylene. This combination of materials provides a strong and lightweight helmet. Graphite is known for its high strength and stiffness, while polyethylene is a lightweight and flexible material. The use of these materials ensures that the helmet can provide adequate protection while still being comfortable for the wearer.

The correct answer is "right rear." The communication earplugs (CEP) are attached to the HGU-56/P helmet shell using a connector on the right rear. This means that the earplugs are connected to the back of the helmet on the right side.

If a pilot is experiencing symptoms of decompression sickness, descending to a lower altitude can help relieve these symptoms. Decompression sickness occurs when there is a rapid decrease in pressure, causing gases in the body to expand and form bubbles. By descending to a lower altitude, the pressure on the body decreases, allowing these bubbles to shrink and alleviate symptoms. This is a commonly recommended action for pilots who experience decompression sickness during flight.

The CQU-7/P blower assembly requires a voltage of 28 ± 4 volts to operate when connected to the aircraft power supply. This means that the blower assembly can operate within a range of 24 to 32 volts, with 28 volts being the ideal voltage. The ± 4 volts indicates the acceptable tolerance range for the voltage supply, allowing for slight variations in the power supply without affecting the operation of the blower assembly.

The correct answer is 24 hours. Silastic adhesive needs to cure for a sufficient amount of time in order to create a strong and durable bond. Allowing it to cure for 24 hours ensures that the adhesive has fully set and will provide a secure seal for the microphone gasket on the AERP equipment. Curing for a shorter period of time may result in a weaker bond, while curing for a longer period of time may not provide any additional benefits and may unnecessarily delay the use of the equipment.

On the EEU-2/P goggles, approximately 20 percent of ambient light is allowed to pass through the analyzer in the open mode. This means that the goggles will block around 80 percent of the ambient light, providing a significant reduction in brightness and glare. This level of light transmission allows for better visibility and protection in bright environments while still allowing some light to pass through for improved vision.

The image produced by the image intensifier tube (ITT) is focused onto the diopter lens. The diopter lens is responsible for adjusting the focus of the image, ensuring that it appears clear and sharp to the viewer. It helps to correct any visual impairments or refractive errors, allowing the viewer to see the image with clarity.

To verify delamination in ALEP glasses, one needs to carefully look through the spectacle lenses. Delamination refers to the separation of layers in the glass, which can cause distortion or haziness. By examining the lenses from a distance of 1 foot, any signs of delamination such as bubbles, cracks, or separation between layers can be easily identified. This distance allows for a close inspection while still providing a clear view of the lenses.

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The correct answer is linear, angular, or centripetal. Linear acceleration refers to the change in velocity in a straight line, angular acceleration refers to the change in angular velocity, and centripetal acceleration refers to the acceleration towards the center of a circular path. These three types of acceleration are commonly encountered in aircraft movements and maneuvers.

The purpose of the thermoplastic liner (TPL) fitting caps is to simulate the thickness of the foam in the TPL removable cover. This means that the caps provide a representation of the foam's thickness, allowing for accurate fitting and alignment of the TPL. By using the fitting caps, practitioners can ensure that the TPL is properly positioned and that the final product will provide the desired level of support and comfort.