How do you check the cylinder starting air valve for leak?

• Finished with engine
• Get propeller clearance from bridge
• Indicator cocks must be open
• Unit to be tested to be brought to TDC
• Turning gear must be disengaged for test
• Control air to starting air distributor must be SHUT
• Automatic starting air valve must be manually opened
• If start air valve leak, hissing sound is heard at indicator valve.