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

Page: 335 / 1956

PAGE 17
Feb 28/07 2E9
21-50-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
10 Close the low pressure control valve and the high pressure control valve on the
charging stand. Stop the vacuum pump and observe the compound gauge. If the
gauge rises at a rate faster than 1 in. Hg. in 5 minutes, there is a leak in the system.
Locate and fix the leak. Repeat the evacuation steps above.
11 Open the low pressure control valve and the high pressure control valve on the
charging stand. Continue pumping and hold the system pressure below 26 in. Hg. for
a minimum of 30 minutes. All the pumping time specified above may be included in
the 30 minutes provided that no leaks or blockages are noted, and provided that the
system is not opened by removal or disconnection of components.
12 Close the low pressure control valve, the high pressure control valve and the vacuum
control valve. Stop the vacuum pump and perform the charging procedure
immediately.
(b) Using a Robinair 34700 or similar charging/recovery stand: (See Figures 3 and 6.)
Turn aircraft power OFF before beginning.
1 Remove access panel at rear of cabin to gain access to service valves.
2 Remove protective caps from the high and low side service ports on the evaporator
unit.
3 Close both the low side and high side valves on charging unit.
4 Connect the blue and red hoses to the service ports (see Figures 1 and 2). On
systems equipped with quick disconnect connections, open coupler valves.
5 Open blue (low side) valve (1) on unit’s control panel.
6 Open both the red GAS (vapor) valve and the blue LIQUID valve on the tank.
7 Program the length of evacuation time.
a Press the VACUUM key on control panel key pad.
b Display will show unit is in VACUUM mode.
c Refer to operator’s manual for further detail.
8 Enter the required time in minutes and seconds (30:00 minutes minimum) by
pressing appropriate keys and then ENTER on keypad. The display will show
selected time in minutes and seconds. Example: one hour and fifteen minutes (1:15)
would be entered as 7500. The display will show 75:00. Thirty minutes is entered as
3000. the display will show 30:00.
9 To start the vacuum pump press the VACUUM key on keypad again.
10 Vacuum sequence will continue for the programmed time. Digital display will then
show CPL, indicating that the evacuation is completed.
11 If, after 5 minutes of pump operation, the RED gauge does not indicate a little below
zero:
a Stop the pump by pressing the 1 key or the SHFT/RESET key.
b Eliminate blockage in the system by replacing faulty parts.
c Repeat steps (1) through (8) above.
12 After 5 minutes of pump operation, when RED gauge indicates a little below zero,
open red (high side) valve (2), and continue evacuation.
a System vacuum should attain 24 to 26 inches of mercury (in. Hg.) in 10 to 15
minutes.
b Allow pump to hold system vacuum at or below 26 in. Hg. for a minimum of 15
minutes.
c Failure to achieve or hold a vacuum at or below 26 in. Hg. indicates a leak in the
system. Perform Leak Detection, below, to locate and repair all leaks.