Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 346 / 1956

PAGE 28
Feb 28/07
2E20
21-50-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(f) Tighten/re-tighten fittings as necessary to stop leak(s). If leaks are due to damaged or
worn components, proceed with refrigerant recovery/system discharge, perform repairs or
component replacement and repeat leak detection procedure.
(g) Check that the both high side and low side valves on the manifold hand set are closed.
(h) Close service valve on refrigerant container. Disconnect yellow manifold hand set center
hose from refrigerant container.
(i) On systems equipped with quick disconnect connections, close coupler valves.
Disconnect manifold hand set red and blue hoses from airplane service ports. Remove
manifold hand set.
(j) Recover remaining refrigerant from system using the Robinair 34700 (or other approved)
charging station (ref. paragraph 3.C.(1)). Any quantity of oil recovered from aircraft must
be measured and an equal amount of new oil (mineral oil or P. A. G., as appropriate) must
be added to system before recharging.
(k) On systems equipped with quick disconnect connections, close coupler valves.
Disconnect charging/test station from service ports.
(l) Perform evacuation procedure per Evacuating the System, above.
(m) Immediately charge system per Charging the System, above or below.
(4) Charging the System
This method is the least desirable due to the requirement of operating the airplane’s engine to
run the compressor.
CAUTION: ASCERTAIN THAT THE AREA AROUND THE AIRPLANE IS CLEAR AND THAT
A QUALIFIED PERSON IS AT THE CONTROLS OF THE AIRPLANE.
(a) Keep the system under the vacuum established during the evacuating procedure with
both hand valves in the closed position. Disconnect evacuation set-up, if not already
disconnected.
(b) Attach a container of the appropriate refrigerant to the manifold set and open the
container service valve.
(c) Loosen the center hose at the manifold set until a hiss can be heard. Allow the gas to
escape for 2 to 3 seconds, then tighten the connection.
(d) Open the high side manifold set hand valve, observe the low side gauge, then close the
high side hand valve. The low side gauge should immediately change from an indication
of a vacuum to an indication of pressure. If it does not, the system is blocked, and the
blockage must be corrected before proceeding.
(e) Start the engine and operate it at 1000 rpm.
(f) Adjust the airplane air conditioning controls for maximum cooling, high blower speed.
(g) Keep the refrigerant cylinder in an upright position. A slug of liquid refrigerant entering the
system would damage the compressor.
(h) Open the low side manifold set hand valve and allow 1.5 pounds of refrigerant in the gas
state to enter the system.
(i) Close the low side manifold set hand valve.
(j) Proceed with the Post Charging Operation Check, below.