<table><tr><th>From:</th><th>jeffrey E. &lt;jeevacation@gmail.com&gt;</th></tr><tr><td>Sent:</td><td>Sunday, June 28, 2015 9:52 AM</td></tr><tr><td>To:</td><td>Ivjet</td></tr><tr><td>Subject:</td><td>ram air duct door. ? the adc controls valves. bad adc?? ??!</td></tr></table>

ACM and rotates in consonance with them. It provides cooling air flow across the primary and secondary heat exchanges whenever=the air

conditioning unit is in operation. Air for cooling is deliv=red through the dorsal fin ram air inlet

inflight and through that =nlet plus a flapper door in the refrigeration unit ducting on the

g=ound. All air is then ported overboard. The cooling fan cannot be individu=lly controlled.

## MAINTENANCE MANUAL

Included in the Environme=tal Control System (ECS) are two ACM bypass shut-off valves and

ass=ciated ducting. The ACM bypass shut-off valves are 1.5 inch nominal diamet=r valves

which allow airflow around the turbine section of the ACM =henever open. The unit receives

its signals from the air data compu=er which opens valves at an altitude of 42,000 feet or

greater and =loses valves at an altitude of 40,000 feet or less. The valve is spring-lo=ded to

close in event of failure. The valve contains a

## =AO please note

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