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

Page: 719 / 1956

PAGE 13
Feb 28/07
30-60-00
3K7
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
CHART 2
DEICER ELECTRICAL RESISTANCE
Maximum Minimum
Two (2) Blade Propeller
Single Blade 4.90 4.70
Both Blades in Parallel 2.45 2.35
Three (3) Blade Propeller
Single Blade 4.56 4.12
All Blades in Parallel 1.52 1.37
(2) Ammeter Test
(a) Check ammeter by connecting calibrated test ammeter or volt-ohmmeter with ammeter
scale, into de-icing system circuit between bus bar and system ammeter. Activate system
and check amperage reading on test ammeter. Reading should agree with reading on
system ammeter. Deactivate system and remove test ammeter or volt-ohmmeter. If
readings are different, and deicing system operates satisfactorily, replace system
ammeter.
(b) If the timer and ammeter tests are satisfactory, circuit breaker and switch are functioning
correctly. If testing is unsatisfactory, and timer and ammeter check out satisfactorily, repair
or replace circuit breaker and/or switch.
C. Propeller Deicers (i.e. - Heater Boots)
(1) Final Electrical Check
(a) Verify that deicers are installed so that blades can be moved throughout the entire blade
pitch range without placing deicer leads or straps under tension. Make certain that all
terminals are tight. Do not over torque.
(b) Check the electrical resistance between terminals or between the slip rings. The reading
should be per Chart 2.
(2) Functional Check
(a) S/N’s 4636001 thru 4636131 only:
CAUTION: DO NOT OPERATE PROPELLER HEAT EQUIPMENT WITH ENGINE NOT
RUNNING FOR MORE THAN 30 SECONDS.
1 Lock brakes, with engine operating at 2,000 rpm, turn PROP HEAT switch ON.
2 De-ice ammeter shall indicate in the green range (8 to 12 amps). Cycle time is 90
seconds ON and 90 seconds OFF.
3 Turn PROP HEAT switch OFF. Turn engine OFF.