Piper Navajo PA-31 Service Manual page 130

PIPER NAVAJO SERVICE MANUAL
4-50. INSTALLATION OF WINDSHIELD. (Heated) (Refer to Figure 4-8.) When installing
the heated
windshield, to prevent damage, the protective paper on the windshield should remain until
the installation
is complete. Do not allow the vinyl tape used to install the heated glass to contact any
surface of the plastic
windshield. Use only a non-metallic window sealer.
a.
Apply Behr-Manning Vinyl Sponge Tape 1 x 1/16 inches, P/N 542 or equivalent on the
outside
surface of the windshield, around the outer edges.
b. Apply masking tape around windshield and along the edge of the collar, skins and trim strip before
applying S E M KIT Sealer PR 1221 -B2 or PR 1425 on the outside surface of the windshield around
the edges of
each side and top
c. Slide the windshield aft and up into place. Use caution not to dislocate the sealer or vinyl
tape
around the edges of the windshield.
d. Install outside center trim strip, machine screws and round nuts. Do not tighten.
e. Install the retainer screws around the top, outboard side and bottom of the windshield. Do
not
tighten.
f. Torque (std torque) the screws that secure the retainer molding around the inside of
the
windshield.
g. Torque the retainer screws around the outside of the windshield and center trim strip to 20
+ 2
inch pounds.
h.
Apply Sealer PR 1221-B2 or PR1425 at the bottom of the windshield in the hollow between
the
outside edge and the channel. Do not build up the sealer above the inside contour of the collar
molding, thus
causing a poor fit of molding against the windshield.
i.
Install the collar molding around the bottom of the windshield and tighten the retainer screws until washers
begin to compress snug against strip.
j. Apply Sealer PR 1221-B2 or PR1425 to any areas around windshield that may allow water
to
penetrate past the windshield.
k. Install switch panel and trim molding around inside of windshield.
l.
Remove excess exposed sealer or tape.
m. Connect the electrical leads to the windshield. Ascertain that the positive lead at the center
of
windshield is connected to the red terminal marked "P". The heat sensor leads connect
to the white
terminals. (Refer to Heated Windshield Schematic, Section XI.)
n.
Remove protective covering from windshield.
o. Check operation of the windshield heating element and timer by first connecting a 24-volt test
light to the positive and negative terminals on the windshield.
q.
Hold a hand against the windshield to determine that the windshield heating element is operating.
The test light should go out before it becomes too hot to hold hand against the windshield (95°-100)
indicating that the temperature sensing element is operating properly and it has passed
through its
thermostatic on/off cycle. Repeat this for one or two more cycles.
r.
When check is completed, turn off the switch.
s.
Check electrical resistance of windshield by connecting ohmmeter to positive lead (on terminal bar
at center edge of windshield) and ground tab (on left edge of windshield). Resistance should be 1.5 to 2.0
ohms.
t. Check temperature sensor electrical resistance by connecting an ohmmeter to the lower two termi-
nals (on terminal bar at center edge of windshield). Resistance should be 125 ohms at 60° F and 140
ohms at
110 F.
4
-50a. WINDSHIELD WIPER MECHANISM.
4-50b. REMOVAL OF WIPER MECHANISM. (Refer to Figure 4-9 )
a.
Remove the access panel on the left side of the nose section.
b.
Cut the lockwire (5) at the bolt which secures the arm (3) to the serrated converter shaft
and
remove the bolt.
Revised: 10/12/83
STRUCTURES
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