Air Intake; Mass Flow Control And Accessory Cooling Intake - Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual

Mass Flow Control and Accessory Cooling Intake

Ambient air for the mass flow control valve is provided by an air inlet in the rear upper cowling
hatchback. In addition, this air inlet provides engine accessory cooling for the starter-generator and
alternator.
The open-top design of the air inlet demands proper drainage for correct operation. Accordingly, a drain
hose is attached on the right side.
CAUTION: THE AIR INLET DRAIN HOSE (A) MUST BE ROUTED AS SHOWN IN FIGURE 1.
On several occasions, after the removal and reinstallation of the rear upper cowling hatchback and/or the
air inlet duct assembly itself, the drain hose (A) has been inadvertently re-routed as shown in Figure 2.
Additionally, the electrical connector (B), can also be reinstalled in the wrong location. The configuration
of the hose and the connector shown in Figure 2 could interfere with the fuel control arm (C) on the fuel
control unit, which could result in an inability to reduce engine power.
NOTE: Item callouts (i.e. - (A), (B), (C), etc.) are keyed to Figures 1 and 2.
Drain Hose Routing Inspection.
Each 100 hours and whenever the rear upper cowling hatchback, the air inlet duct assembly or
drain hose, or the engine overboard breather drain tube are removed, replaced, or reinstalled:
(1) Open Gull Wing door on right side on the engine compartment.
(2) Inspect air inlet drain hose routing. If the air inlet drain hose (A) is routed as shown in Figure 1,
the electrical connector (B) is installed as shown in Figure 1, and the area around the fuel
control arm (C) is clear, no further action is required - proceed to step (4).
(3) If air inlet drain hose (A) is improperly routed and/or the electrical connector (B) is improperly
installed (see Figure 2 for examples), re-route and resecure the air inlet drain hose (A) and/or
reinstall the electrical connector (B) in the configuration shown in Figure 1. Install new clamps
and hardware as required: (see Figure 1)
(a) For the drain hose add (D) two (2) clamps (one (1) P/N 554-906 and one (1) P/N 454-977)
with one (1) each screw MS35207-263, washer NAS1149F0332P and nut MS21042-3.
(b) For the electrical connector add (E) two (2) clamps (one (1) MS21919-WH8 and one (1)
MS21919-WH16) with one (1) each screw MS35206-245, washer NAS1149GFN816P
and nut MS21045-08.
(4) Close Gull Wing door on right side on the engine compartment.
7E23
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
AIR INTAKES
71-60-00
Apr 15/07
PAGE 1