Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual page 1381

C. Rigging and Adjustment
WARNING: STABILIZED GROUND OPERATION BELOW 1200 RPM (N P ) CAN GENERATE HIGH
PROPELLER STRESSES AND RESULT IN FATIGUE DAMAGE TO THE
PROPELLER. THIS DAMAGE CAN LEAD TO A REDUCED PROPELLER FATIGUE
LIFE, PROPELLER FAILURE, AND LOSS OF CONTROL OF THE AIRCRAFT.
CONTACT THE PROPELLER MANUFACTURER FOR CORRECTIVE ACTIONS IF A
PROPELLER RESTRICTION OR LIMITATION IS VIOLATED.
The propeller speed control rod is designed to act as a propeller control lever set at full fine pitch
(i.e. - maximum). Accordingly, adjust it to hold the governor propeller speed control arm full against
its stop.
(1) With engine static, disconnect pneumatic (P y ) line from left rear of governor. Blank off nipple
with suitable cap.
(2) Perform pre-start check.
(3) Start engine and allow it to warm up in idle setting until normal operating oil temperature is
reached. (60°C (140°F) minimum.)
(4) Advance power control lever to obtain 80% Ng. Perform two feathering cycles to purge air from
system. To reduce feathering time, turn feathering adjuster (Figure 2) counterclockwise.
NOTE: Two complete turns (counterclockwise from the nominal setting) is the maximum
permitted adjuster range.
(5) Advance power control lever to allow constant propeller speed. Temporarily mark position of
lever on quadrant and record Ng.
(6) Adjust governor maximum speed adjuster (Figure 2) as necessary to obtain 2000 RPM
propellor speed. Turn screw counterclockwise to increase speed and clockwise to decrease
speed.
(7) Record Ng, torque, and fuel flow.
(8) Shutdown engine and reconnect pneumatic (Py) line to left rear of governor. Torque coupling
nut 90 to 100 in. lbs and safety. Restart engine.
CAUTION: DO NOT ADJUST PNEUMATIC MAXIMUM ADJUSTMENT (FIGURE 2).
(9) Advance power lever to position previously marked. Compare Ng with previously recorded
figure. Maximum permissible Ng drop is 100 RPM. If previous Ng is exceeded, check topping
governor (i.e. - air bleed) linkage is contacting the maximum stop, adjust link rod as necessary.
(10) Repeat step (9).
(11) Shutdown engine, disconnect topping governor link rod (Figure 2) at air bleed link. Secure link
to minimum stop.
(12) Restart engine. Advance power control lever to maximum stop and record Np. Check that Np is
86% ± 1% of maximum speed set in step (6). Adjust pneumatic minimum eccentric adjuster
(Figure 2), in increments, to meet this requirement.
(13) Shutdown engine and reconnect air bleed link to topping governor link rod.
(14) Restart engine and check reverse power setting. Reverse propeller Np should not exceed
1900 ± 10 RPM.
7C17
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
61-20-00
Apr 15/07
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