Fuel Purge System - Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual

2.

Fuel Purge System

In serial numbers 4697174 and up,
combustion chamber and consumed.
The system consists of a bleed air purge tank, lines, filter and check valves. Engine pressure bleed air
accumulates in the purge tank and is released during shutdown, as the fuel pressure drops, forcing
residual fuel back into the burner. The fuel is then completely consumed. The upper check valve allows
bleed air into the purge tank until pressure in the tank reaches equilibrium with the bleed air system. The
lower check valve keeps fuel out of the purge tank when the fuel system is pressurized and as fuel
pressure drops during shutdown allows the air in the purge tank to force the residual fuel into the
combustion chamber. The air filter ensures that any particles found in the bleed air system cannot
contaminate the fuel system.
A. Removal. (See Figure 4.)
The purge tank, clamp, air filter, upper check valve, and inlet tube are removed together and
disassembled on the bench. The outlet hose and lower check valve/union assembly are removed
individually.
(1) Remove upper forward and lower cowlings as described in 71-10-00.
(2) Purge tank, clamp, upper check valve, air filter, and inlet tube:
(a) Disconnect the inlet tube from the bleed air tube.
(b) Disconnect the outlet hose from the purge tank.
(c) Remove clamp retaining screw and remove components.
(d) See Bench Disassembly, below.
7F5
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
residual fuel remaining in the lines at shutdown is blown into the
P3 AIR
(SEE 21-20-00, FIGURE 1)
FLOW DIVIDER
Fuel Purge System Functional Schematic
Figure 3
AIR FILTER
UPPER CHECK VALVE
FUEL PURGE TANK
LOWER CHECK VALVE
71-70-00
Effectivity
4697174 & up
PAGE 3
Apr 15/07