Piper CHEROKEE WARRIOR PA-28-151 1995 Maintenance Manual page 310

PIPER CHEROKEE WARRIOR SERVICE MANUAL
b. Post installation functional check:
(1) Level airplane, ± 1°, longitudinally and laterally.
(2) Place battery-alternator switch in OFF position.
(3) Completely drain fuel tank that relates to the gauge to be checked. (Refer to draining fuel
system, chapter 12.)
(4) Connect external power supply to airplane's electrical system using APU connector.
( 5 ) Adjust power supply unit to provide 24 to 28 Vdc. Allow gauges to warm-up for a mini-
mum of three minutes.
(6) Place 1 U. S. gallon of fuel in each tank. After recording reading, add fuel in increments
specified in Table IX-V. Verify gauge readings.
TABLE IX-V. 28 VDC FUEL QUANTITY GAUGE TOLERANCE VALUES
FUEL ADDED ACTUAL FUEL
(U. S. GALLONS) IN TANK (U. S.
1
5
5
5
9
9 - 1 5 . CHECK AND ADJUSTMENT OF FUEL QUANTITY TRANSMITTER UNIT.
a . PA-28-151 and P28-161, Warrior II Stewart Warner Fuel Quantity Transmitter Check.
1. Remove transmitter unit to be checked from the fuel tank.
2. Check and adjust transmitter unit float position as follows:
(A) Fasten unit to a fabricated checking jig (Figure 9 - 6.) with washer and nuts. (Fabricate jig
per Figure 9-7 dimensions.)
(B) Check with the float arm down against mechanical stop on transmitter, the float is just
touching base of jig. (Float may be to 0.18 inch above base.) If float does not touch the base or float arm is not
against bottom stop, adjust float assembly arm stop by bending it per Figure 9-6. The entire surface of float
must be horizontal with the jig base.
3 Check transmitter unit for correct resistance and dead spots as follows:
(A) Connect an ohmmeter to transmitter unit and move float arm to its bottom mechanical
stop. Ohmmeter must read ohms resistance as per Table IX-VI.
(B) Move float arm to its upper mechanical stop and check ohms resistance.
(C) Check for dead spots by slowly moving float arm from bottom stop, to upper stop, and
back. Ohmmeter indicator must move steadily up and down scale without fluctuation as float arm is moved.
(D) If there is incorrect resistance or dead spots, replace sending unit.
TABLE IX-VI FUEL QUANTITY TRANSMITTER CALIBRATION TOLERANCES
UNIT
P/N 486 520
(Rubber Float)
Added: February 28, 1995
GAUGE
INDICATION
GALLONS)
1
6
11
16
25
POSITION
Empty
2A22
Island Enterprises
TOLERANCE
(NEEDLEWIDTH)
0 +0, -1
5 ±3/4
10 ±1
15 ±1 1/2
F ±1 1/2
Full
RESISTANCE
R E F E R E N C E
(OHMS BOTH
SENDERS)
3
14
23
33
45
RESISTANCE
240 +20, -0 ohms
33.5 +0, -4.5 ohms
FUEL SYSTEM