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

Page: 303 / 1956

PAGE 7
Feb 28/07
2D1
21-30-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
3. Components
A. Cabin Outflow Valve / Cabin Safety Valve (See Figure 2.)
The outflow valve consists of two sections, a head section and a base section. The head section
contains port "2" (controller connection) and a plugged cabin air port. Mounted on the head is the
differential control, which contains port "1" (true static atmosphere connection with orifice). The
base assembly encloses a poppet outflow valve which seats on a surface of the base assembly
when in the closed position.
The safety valve consists of two sections, a head section and a base section. The head section
contains port "2" depressurization connection and a cabin air filter with orifice. Mounted on the head
is a differential control which contains port "1" (true static atmosphere connection with orifice). The
base assembly encloses a poppet outflow valve which seats on a surface of the base assembly
when in the closed position.
(1) Removal
(a) Disconnect the two lines from the valve being removed.
(b) Remove the three nuts which secure the valve to the aft pressure bulkhead.
(c) Remove the valve from the pressure bulkhead.
(2) Installation
(a) When reinstalling outflow and/or safety valve, the gasket dimension shown in Detail A of
Figure 2 must be met to ensure proper sealing. To provide proper clearance between nuts
and gasket face, adjust for clearance as follows:
1 Remove nuts using a deep socket and remove enough shims to meet dimensional
requirements. A minimum of one shim is required each place for installation of nut.
2 Install nuts and tighten.
3 Apply a drop of locking compound, MIL-S-22473-EV, to the top of nuts between nuts
and studs.
(b) Position the valve on the rear pressure bulkhead.
(c) Install the three nuts which hold the valve to the aft pressure bulkhead. Torque nuts to 20
in. lbs.
(d) Reconnect the two lines to the valve.
(3) Servicing
Routine maintenance of the valves is limited to the replacement of the filter in the safety valve
and cleaning of the seats in both valves.
Using Joy detergent or isopropyl alcohol, clean the seats of either valve thoroughly.
B. Auxiliary Volume Tank
This is a small sealed chamber located close to the controller; and when connected to the
controller, it provides additional volume to the rate pressure chamber in the controller, thus
providing greater accuracy of the cabin rate-of-control.
C. Vacuum Regulator (See also 37-10-00.)
Vacuum to operate the safety valve and controller is obtained from the vacuum system which
utilizes its own regulator. The regulator, set to provide 4.8 to 5.2 inches of mercury (relative to cabin
pressure), is incorporated in the system between the vacuum-driven instruments and the pump.