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

Page: 980 / 1956

PAGE 34
Feb 28/07
5E14
34-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
c With the ADAHR S test cable installed, and the calibration switch in the
"CALIBRATE" (closed) position, slowly taxi the aircraft in two (2) complete 3 60-
degree turns. The direction of the turn does not matter; however, a minimum
time of one (1) minute for each
3 60-degree turn (two (2) minutes minimum for
the full 720 degrees) is required for the calibration process. The slow turn rate
permits more data point samples for constructing the compensation curve. Make
sure that the turns are continued until the heading flag is replaced by a normal
heading indication.
d Upon completing the two turns, the magnetic heading will automatically be
displayed on both the EADI and EH
S I. Place the ADAHR S test cable calibration
switch in the "NORMAL" (open) position. Allow the compass system to stabilize
for one (1) minute.
e With the ADAHR S test cable calibration switch in the NORMAL (open) position,
perform a complete heading system "swing". A settling time of two (2) minutes
must be used at each heading to ensure heading stabilization. After two (2)
minutes of settling, record the indicated heading against the known compass
rose heading for all twelve compass rose points in Chart 12. The heading
system error should not exceed ± 2 degrees on any compass point.
7. Magnetic Heading S ystems - S /N’s 46 3 6 3 75 and up
Two Magnetometer / OAT S ensor Assemblies (Mag/OAT) feed magnetic heading information to the
Primary Flight Displays (PFD’s) and the Multifunction Display (MFD). The Mag/OAT’s are mounted under
the dorsal fairing atop the aft fuselage at F.
S . 2 8 2. 3 72. S ee Figure 6.
NOTE: The OAT sensors in the Mag/OAT assemblies are not used. S ee Outside Air Temperature in
3 4-10-00.
A. Magnetometer/OAT (MAG/OAT) Assemblies
(1) Removal
(a) Remove the dorsal fairing to expose the magnetometers.
(b) Disconnect the wiring harness(es) from the aft fuselage harness.
(c) Unscrew the three screws securing the OAT probe mounting plate to the mounting
bracket.
(d) Remove the OAT probe mounting plate and unscrew and remove the OAT probe nut(s)
from the bottom of the mounting plate and remove the OAT probe(s).
(e) Unscrew and remove the three brass screws and washers securing the magnetometer to
its mounting bracket and remove the magnetometer(s).
(2) Installation
CAUTION: THE MAGNETOMETER S ARE S ECURED TO THE MOUNTING BRACKET
WITH BRA SS S CREW S . EN S URE ONLY BRA SS S CREW S ARE U S ED WHEN
REIN S TALLING.
(a) Place the magnetometer(s) into position on its mounting bracket, with the arrow on the
magnetometer pointing forward, and secure with brass screws and washers (
3 ea).
(b) Place the OAT probe(s) into position on its mounting plate and secure with nut(s) from
bottom.
(c) Place OAT probe mounting plate into position on mounting bracket and secure with brass
screws and washers (
3 ea.)
(d) Connect wiring harness(es) to the aft fuselage harness.