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

Page: 630 / 1956

PAGE 2
Feb 28/07
3G14
28-40-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
2. Fuel Quantity Gauge Accuracy Test ( S/N’s 4636001 thru 4636020 only. )
(PIR-PPS60032-8, Rev. B.)
A. Pre-installation check.
Prior to installation, bench test the gauge as follows:
(1) Install dummy resistor across left or right sender as shown in Figure 1.
(2) Connect resistance decade across sender terminals not used by dummy resistor.
(3) Apply 28 ±1 VDC to the positive and negative terminals at the rear of the gauge and through
the resistance decade as shown in Figure 1.
(4) Low end adjustment: Select position “G” on resistor decade. Verify that instrument needle
points to “E.” If not, adjust respective “NULL” potentiometer to center needle on “E” radial.
(5) High end adjustment: Select position “A” on resistor decade. Verify that instrument needle
points to “F.” If not, adjust respective “GAIN” potentiometer to center needle on “F” radial.
(6) Full range check: After low and high end adjustments have been made, verify that for each
resistive value the gauge indication is as specified in Chart 1.
B. Post-installation functional check.
(1) Set up:
(a) Level the airplane ±1 degree laterally and longitudinally. See 8-20-00.
(b) Place the battery switch in the OFF position.
(c) Connect the external power supply unit.
(d) Adjust the power supply to provide 28 ±1 VDC.
(e) Continue with procedure below, record test results when completed.
Pre-Installation Test Set-up ( S/N’s 4636001 thru 4636020 only. )
Figure 1
102.3 OHMS
58.7 OHMS
38.8 OHMS
2 9 .5 OHMS
16.1 OHMS
B
C
D
E
F
A
SWITCH
FUEL QUANTITY
INDICATOR
(REAR VIEW)
DUMMY RESISTOR
( ANY VALUE
6.8 TO 102.3 OHMS )
28 VDC
LEFT
RIGHT
GND
6.8 OHMS
G
75.2 OHMS
+
LEFT
NULL AND GAIN
POTENTIOMETERS
RIGHT
NULL AND GAIN
POTENTIOMETERS