This comprises a pump on each engine either of which draws air through the gyro‐operated instruments via a change‐over cock (dash‐starboard) and Plessey 215B adjustable relief valves, set to 5 in. Hg. on forward face of each firewall. The suction gauge is on the port side of the dash. If an automatic pilot is fitted, it is connected to the discharge from the port pump, otherwise the pumps exhaust into an oil drain collector box at the bottom of each firewall.
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