956A1601 is a precision-engineered aircraft engine bleed air pressure sensor calibration adapter, compliant with AS9100D aerospace standards and SAE AS7154 specifications, specifically designed for CFM56-5B/7B engine maintenance on Boeing 737 NG/MAX and Airbus A320 family aircraft.

Crafted from 316L stainless steel with a passivated finish for corrosion resistance, it features a 3/8-inch NPT male fitting compatible with standard calibration hoses and a quick-release locking mechanism for secure attachment to engine bleed air ports. Weighing 0.75 kg and measuring 120mm in length, it enables accurate sensor calibration within a pressure range of 0–150 psi, operating in temperatures from -50°C to 120°C. This essential GSE component ensures reliable engine bleed air system performance, making it a staple tool for MRO technicians during aircraft engine inspections and repairs.