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Use this tag for questions pertaining to the maintenance of aircraft, including owner-performed maintenance and required inspections (annual, 100-hour, etc.)
4
votes
What is the function of this small hole on the B737's hydraulic reservoir line?
Answering based on ATA 49 system, B757/767 APU Surge Control Valve muscle air plumbing.
Some pneumatic sensing and pressure systems have a moisture bleed hole to prevent icing in the system. They ar …