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

Page: 446 / 1956

PAGE 4
Feb 28/07
2J4
24-60-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
Component / No. Duty CB Max. Drain
Bus System Electrical Load Units Cycle Amps Amps (28 Vdc)
CHART 1 (Sheet 3 of 3)
ELECTRICAL SYSTEM LOAD DISTRIBUTION
(PIR-VB-1349.)
AVI Vibrator Int. 2.00
AVI WX-1000 Stormscope Cont. 1.00
AVI Yaw Damper Int. 1.80
Notes: (1) S/N’s 4636001 thru 4636020 only.
(2) S/N’s 4636021 thru 4636131 only.
(3) S/N’s 4636132 and up.
(4) S/N’s 4636021 and up.
General: “Bus” Abbreviations: AVI = Avionics, M = Main, NE = Non-Essential, TIE = Tie
Avionics listed above include optional installations.
“# Units” default value is one.
“Duty Cycle” = Intermittent or Continuous.
Annunciator Control bulbs (.04 EA.) are normally OFF.
Windshield Heat Relays and High and Lo are each 50% duty cycle.
Prop Feather engages at engine shutdown.
Rudder Trim is 20% duty cycle.
S-TEC Autopilot draws 0.68 for 50% and 0.90 for 50% when in cruise; and 0.68 during takeoff and landing.
3. Volt / Ammeter
The volt / ammeter combination indicator consists of two ammeters and a volt meter mounted in one
case. The ammeters indicate amperage load on each alternator. The voltmeter indicates total system
voltage. The best troubleshooting approach to determine this instruments condition, is to compare the
readings with a known good meter.
Should rapid and steady state ammeter needle oscillation occur, first thoroughly clean all traces of
corrosion from all grounding points throughout the electrical power distribution system. This is not to be
confused with normal ammeter fluctuations showing changing current flow within the aircraft’s electrical
system. The combined ammeter readings indicates the total current flow, except for the engine starter.
The voltmeter portion of the instrument shows main bus voltage. Should the instrument fail to indicate
correctly, substitute a known good voltmeter before condemning the instrument. Placing a good
voltmeter in parallel with the indicator is the best practice.