Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 721 / 1956

PAGE 15
Feb 28/07
30-60-00
3K9
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(2) S/N’s 4636132 and up :
(a) Lock brakes, with engine operating at 2,000 rpm, and one alternator ON, turn PROP
HEAT switch ON.
(b) Verify that the green PROP HEAT switch flashes rapidly for 30 seconds, indicating the
deicer is in the ON cycle. After approximately 30-45 seconds, the flash rate should
reduce, indicating the deicer is in the OFF cycle. The switch will continue to flash at the
reduced rate as long as the airplane remains on the ground or until the PROP HEAT
switch is deselected. Verify that the PROP DE-ICE FAIL annunciator does not illuminate.
(c) Verify that the ship’s total amperage (LH and RH combined) shows an increase of
approximately 15 amps with the 3-bladed propeller, or 10 amps with the 2-bladed
propeller, when the PROP HEAT is cycled ON.
(d) Turn PROP HEAT switch OFF. Turn engine OFF.
(e) Perform “heat test” as follows: with engine stopped, turn PROP HEAT switch ON and
within 30 seconds feel deicer on propellers to verify ON cycle. Within 30-45 seconds of
switching ON, the system will shut itself OFF - verify that this occurs.Temperature rise
should be noticeable. Local hot spots indicate surface damage of deicers requiring
replacement of deicer.
B. 100 Hour
(1) Remove cowling. Conduct appropriate 50 Hour Inspection, above.
(2) Check for radio noise or radio compass interference by operating the engine at near takeoff
power with radio gear ON while turning PROP HEAT switch ON and OFF. If noise or
interference occurs with PROP HEAT switch ON and disappears when switch is OFF, refer to
troubleshooting chart.
(3) Ascertain that all clamps, clips, mountings and electrical connections are tight. Check for loose,
broken or missing safety wire.
(4) Deicers: Closely check deicers for wrinkled, loose or torn areas, particularly around the
outboard end. Check that terminals and terminal studs are not shorting out to each other or the
propeller hub. Inspect wire harness for evidence of chafing or shorting. Ensure that all clamps
and tie straps are properly installed. Look for abrasion or cuts, especially along the leading
edge and the flat or thrust face. If deicer wires are exposed in damaged areas or if rubber is
found to be tacky, swollen or deteriorated (as from oil or solvent contact), replace the damaged
deicer (see Deicers (Propeller Deice System), below).
NOTE: Operate propeller from full low pitch (high RPM) to feathering and check that deicer
lead wires do not come under tension or are pinched by propeller blade (refer to
Figures 3 and 6).
(5) Slip Rings: Check slip rings for gouges, roughened surface, cracks, burned or discolored
areas, and for deposits of oil, grease or dirt.
CAUTION: DISPOSE OF UNUSED MEK AND OTHER CHEMICALS AND SOLVENTS IN A
MANNER CONSISTENT WITH LOCAL LAWS AND/OR ENVIRONMENTAL
PROTECTION AGENCY REGULATIONS.
(a) Clean greasy or contaminated slip rings with CRC 2-26 solvent or with Stoddard solvent.
If Stoddard solvent is used, wipe off with a clean cloth dampened with MEK to avoid
leaving a film.
(b) If uneven wear is found or if wobble is noticed, set up a dial indicator as shown in Figure 5
and check alignment of the slip rings to the propeller shaft as explained in this section.