Aircraft masks

During the 1990s, the army standardized several new protective masks. In 1990, the M43 CB AH-64 Aircraft Mask was standardized for use in Apache helicopters. The unique aspect of the mask was its compatibility with AH-64 display sighting system. Within 6 years, the army improved the mask and... 

The facepiece of the M43 Chemical-Biological Aircraft Mask is fabricated of bromo butyl and natural rubber with an integral butyl hood and skull-type suspension system (Figure 16-10). The M43 has two models, designated Type I and Type II. The two models are identical with the following exceptions Type I has a notch in the right eyepiece that accommodates a special sighting device used by Apache helicopter pilots, and uses a different microphone for communication Type II has two spherical lenses and uses a dynamic microphone. Both microphones interface with the helicopter communications systems. 

Fig. 16-10. The M43 Chemical-Biological Aircraft Mask. Photograph Courtesy of Visual Information Division, US Army Chemical and Biological Defense Command, Aberdeen Proving Ground, Md.

When indium bumps are used to connect two chips having different thermal expansion coefficients and the chips are exposed to repeated temperature cycling, the mechanical stress in the bumps is reduced when the bumps are made taller. If the indium bumps are formed using vapor deposition through a photo-reduced mask pattern, the height of the bumps are limited to 6-9 microns. A fabrication process for making taller indum bumps is disclosed in EP-A-0405865 (Hughes Aircraft Company, USA, 02.01.91). 

We do not know how much ozone may actually be present in a pressurized cabin of future aircraft, as other factors, such as heating of the air passing the compressor or contact with various substances, may destroy part of the ozone and use of oxygen masks would prevent inhaling of ambient air entirely still, the possibility of inhaling ozone exists. The use of ozone as a rocket oxidizer H) may add to such a possibility. 

The M45 will replace the Army s M49 Mask System. The mask provides the required CB protection without the aid of forced ventilation air while maintaining compatibility with rotarywing aircraft sighting systems and night vision devices. See FM 3-5 for filter exchange rates. 

The M48/49 has a pilot-mounted, motor blower, does not require an aircraft-mounting bracket, and can operate continuously for 8 hours on a single battery. The M49 will replace the M24 protective mask, as the general aviator s mask. The M48 will replace the M43 mask and will be worn only by Apache Helicopter Aviators. See FM 3-5 for filter exchange rates. 

Extrusion grade, PEI/PC blend was developed for aircraft applications to meet the federal aviation standards for low flammability, smoke and toxic gas generation [Skeist, 1991]. PEEPC ther-moformable sheet is used for the fabrication of transport aircraft window housings, air ducts, consoles and other components. PEI/PC sheet is also used as high temperamre paint mask in the automotive industry. PEI/PC molding compounds have also been evaluated for microwave-able cookware. Due to the high cost of PEI,... 

Each protective mask in current use is described in detail. There are some differences between the masks designed for helicopter use and high-performance aircraft, owing notably to the operational... 

The mask is connected to two C2A1 canisters, which lower breathing resistance. A hose assembly that attaches to the two C2A1 canisters is located on the left cheek. The canisters are attached to a motor blower unit (capacity 4 cu ft/min), which is powered either by aircraft electrical power or a... 

Mask, Chemical-Biological Protective Aircraft, M43. US Army Chemical Research, Development and Engineering Center Purchase Description EA-M-1352A. Edgewood Area, Aberdeen Proving Ground, Md January 1988. 

Department of the Army. Operator s and Organizational Manual Mask, Chemical-Biological Aircraft M43. Washington, DC HQ, DA June 1988. Training Manual 34240 312-12 P. 

In contrast, the longer wavelength infrared (LWIR) band is desirable for imaging cooler bodies (such as the aircraft itself rather than just the hot engines, which can be masked ) and although LWIR detector materials and missile seekers have been... 

Figure 8.4 The electrochemical machining of air passageways in an aircraft engine component (a) the final component, (b) the mask and electrode assembly and (c) the cathode tool Photographs supplied by Rolls Royce Ltd, Aero Division,...

Defense applications for ACC include NBC (Nuclear, Biological, Chemical) face masks, respirators, filters in closed air conditioning systems such as tanks, submarines and aircraft, protective clothing and combat gear. 

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