Engine Run-Up - Piper Cheyenne IIXL PA-31T2 1981 Pilot Operating Handbook

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PIPER AIRCRAFT CORPORATION
PA-3112, CHEYENNE II XL
4.19 ENGINE RUN-UP
SECTION 4
NORMAt PROCEDURES
Before engine run-up. set the parking brake. Both generators should be
ON and all circuit breakers should be IN. Check the ammeters and
voltmeter. Check function of inverters and inverter bus tie. The propeller
synchrophaser should be turned OFF. Check both fuel pumps on each
engine. making sure that fuel pressure readings remain within limits during
operation of each pump. One fuel pump must be ON for an engine any time
that engine is in operation.
WARNING
Both fuel pumps for each engine must be
operative for takeoff.
Check that the fuel crossfeed valve is OFF. Before takeoff. the Cabin Air
control should be placed in the PRESS (pressurized) position. On the
overhead control panel, switch ON the Bleed Air switches for both engines.
Switch the ECS select on the Cabin Comfort control panel to LOW. To
ensure proper p ressu riza ti on oft he ca bin, the erne rgency gear extender cover
must be securely in position. and the Cabin Pressure control (Test/ Dump)
switch must be in the normal position.
Set the power levers to 1450 RPM. Check that the pneumatic pressure
and gyro pressure gauges are reading within limits.
To test the propeller overspeed governors, advance the propeller
controls to full FORWARD. Pull out and up on the hydraulic topping
governor (HTG) test switches and observe a drop of approximately 120
RPM. Release the HTG switches to their normal position and check that the
propeller speed returns to 1450 RPM.
NOTE
Observe maximum ITT and torque limits.
In accordance with Paragraph 4.39, check the pressurization system.
and set the cabin pressurization controls.
Advance the power levers to I800 RPM for a check of the engine lee
Protection System. Check that the ECS Bypass is OFF. Refer to Paragraph
4.43 for Ice Protection System preflight test procedures.
ISSUED: APRIL 22, 1981
REVISED: MARCH 30, 1984
REPORT: 2272
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