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

Page: 974 / 1956

PAGE 28
Feb 28/07
5E8
34-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(a) Required Equipment
Instrument Flight Research Corp. RF signal generator NAV-40IL or equivalent.
Characteristics of the signal generator include: Frequency ranges 108 to 118 MHz, 117 to
136 Mhz, 328 to 336 MHz; +1/-0.01% accuracy, output level continuously adjustable from
1 .0uV to 0.1V into a 50 ohm load; 50 ohm output impedance; and internal adjustable or
stepped VOR, LOC, and GS modulation. The RF signal generator should be portable and
convenient for use while sitting in the aircraft cockpit.
(b) Procedure
1 Apply power to the Model ST-180 HSI System. Allow at least three (3) minutes for the
gyro to erect and synchronize.
2 Prior to actual alignment of the flux sensor, turn the aircraft to both north and east
headings. Apply power to electrical equipment such as navigation and beacon lights
and verify that the compass system is not affected.
3 Align the aircraft to an approximate magnetic north heading. On Chart 10, record the
actual magnetic heading and the HSI heading card reading.
4 Determine and record on Chart 10 the deviation between the actual magnetic
heading and the heading card heading. If the heading card reads high, the deviation
is a plus.
5 Repeat steps (3) and (4) for east, south, and west headings. Record actual magnetic
headings, heading card readings, and deviations on Chart 10.
6 Plot deviations on the initial deviation graph in Figure 3.
7 Realign the aircraft to north. Adjust the north-south corrector on the Slaving Panel,
for one half of the difference between the north and south deviations. Record the new
deviation for north and south on the initial deviation graph in Figure 3.
8 Realign the aircraft to east. Adjust the east-west corrector on the Slaving Panel, for
one half the difference between the east and west deviations. Record the new
deviation for east and west on the initial deviation graph in Figure 3.
9 If the pattern is not centered around zero, rotate the flux sensor clockwise to correct
for minus deviations or counterclockwise for plus deviations. Plot final deviations on
the final deviation graph in Figure 3.
10 The deviations should now center around the zero reference line of the graph. If the
error exceeds the specified system error limits (± 3 degrees), repeat the complete
procedure.