Installation Of Jet Transfer Pump - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Distribution (continued)
11. Installation of Jet Transfer Pump
(a) Slide pump inlet port into tank nipple and install retaining clamps.
(b) Connect fuel lines to pump.
(c) Install wing root fairings (if previously removed).
12. Removal of Submerged Fuel Pump
(a) Drain entire system or ensure crossfeed valve is off so either wing can be drained separately
without draining fuel from opposite side.
(b) Remove lower wing root fairing from under side of wing where pump is to be removed.
(c) Remove access plate on top of wing, ahead of main spar, next to fuselage. Remove fuel cell
cover plate to gain access to fuel pumps (refer to 28-20-00 Figure 402).
CAUTION: WHEN DISCONNECTING ANY ELECTRICAL CONNECTION ON FUEL PUMPS,
A WRENCH MUST BE USED TO BACK UP EACH TANK CONNECTION TO
PREVENT NYLON FITTING FROM TURNING. IF FITTING TURNS, INTERNAL
WIRE CONNECTION WILL BREAK, NECESSITATING PUMP REPLACEMENT.
(d) In wing root cavity, back up and disconnect electrical connections, fuel, and drain lines from
pump.
(e) While holding pump through cell access opening in top of wing, an assistance must remove
four pump mounting bolts in wing root cavity and pull pump up and out of fuel cell.
13. Installation of Submerged Fuel Pump
(a) Install new gasket on fuel pump mounting boss, insert pump into cell, and hold in place while
assistant attaches it to wing but rib with four mounting bolts.
(b) Reconnect electrical connections, fuel, and drain lines and ensure valves are positioned
properly.
(c) Install fuel cell cover plate and access plate on top of wing. Fill fuel cell through nacelle filler
and check all connections in the wing root cavity for leaks.
(d) Install lower wing root fairing.
EFFECTIVITY:
040-999
PAGE 10 040-999
Jan 10/90
28-20-00