Available Sizes: X-Small Narrow Part Number: G010-1336-01 NSN: N/A Small Narrow Part Number: G010-1190-01 NSN: 1660-01-390-1547 Medium Narrow Part Number: G010-1190-02 NSN: 1660-01-390-1543 Medium Wide Part Number: G010-1190-03 NSN: 1660-01-390-1544 Large Wide Part Number: G010-1190-04 NSN: 1660-01-390-1548

Gentex High Altitude/Low Profile (HA/LP) Oxygen Masks are designed for use in both Pressure Breathing for G (PBG) equipped high performance fighter/attack aircraft and Non-PBG equipped aircraft. HA/LP Oxygen Masks are used by the United States and Foreign Military Services throughout the world.

The HA/LP Oxygen Masks are derivatives of the U.S. Air Force MBU-20/P Oxygen Mask. HA/LP PBG Oxygen Masks provide a bladder supply hose that connects the mask assembly to an occipital bladder in the helmet to provide automatic mask tensioning during high G flight. The Non-PBG HA/LP Oxygen Masks are direct replacements for both MBU-12/P and MBU-5/P Masks.

Similar to the MBU-20/P, the HA/LP Oxygen Masks provide +600 knot windblast protection. The lightweight, low-profile mask design provides optimal positive pressure breathing (PPB) sealing capabilities. Separate inhalation and exhalation valves minimize breathing resistance thus reducing aircrew fatigue.

The masks utilize a lightweight hardshell that may be custom-trimmed to allow optimum comfort while maintaining appropriate fit.

The silicone rubber facepiece incorporates a reflective seal design for optimum sealing capabilities, and a chin cup which provides injury protection during high speed or high altitude ejection.

The silicone breathing gas hose for Non-PBG HA/LP masks can quickly and easily be replaced with a hose that incorporates a port for the PBG helmet bladder supply hose (Gentex mask conversion kit, Part Number: G010-1044-01).

The kit enables a mask to be reconfigured from a Non-PBG to PBG configuration. HA/LP masks can be configured with a variety of microphones including the Gentex Modified M-169A/AIC, Gentex Electret (for U.S. Navy compatible communications), and a NATO compatible microphone. Depending on the microphone used and aircraft type, the appropriate communication cord is provided.

An exhalation valve occluder is incorporated on the compensated exhalation valve to assist the aircrew member in performing Valsalva. This method is in addition to the standard method of performing Valsalva via pinching of the nose.

An optional anti-suffocation valve can be incorporated on the HA/LP Oxygen Masks. The inspiratory activated anti-suffocation valve allows an unconscious or disabled aircrew member to breathe in the event the mask is not removed from the face.

HA/LP Oxygen Masks are available in five sizes to fit the 3rd percentile female through 97th percentile United States male aircrew member.

The Oxygen Masks are used in conjunction with HGU-55/P, and HGU-68/P.

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