Pre-Installation Instructions For Radome Erosion Shield; Preparation And Installation Of Radome Erosion Shield - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
g. Oil can - 3 or 4 oz. dirt and oil free.
h. Masking tape - 1/2" and I" widths.
i. Flexible straightedge.
i. Hypodermic needle - 22 ga.
k. Steel stitcher roller - 1/8".
I. "V" knife.
NOTE
MEK (Methylethylketone) can be used instead ofToluoltoactivate
cement. However. MEK causes very rapid dryingand provides only
10 seconds working time for application compared with 40 seconds
for Toluol.
4-115. PRE-INSTALLATION
INSTRUCTIONS FOR RADOME EROSION SHIELD.
a. Ambient temperature for installation should be between 40°F and I 10°F. Humidity must be below
99% during installation. Longer drying time of cement coats may be required as humidity approaches 99%.
b. EC 1403 cement is normally used as received. However, erosion shields with a tapered trailing edge
or shields with a gauge of less than .060 should be installed with cement diluted with one part ME K to two parts
cement for smoother, neater installation.
c. Use only clean, lint-free cloths for cleaning and activating cement coats.
d. Apply cement coats evenly and uniformly.
e. Cement has reached "proper tack" when it looses "webbiness" and, when touched with back of a
finger knuckle. feels sticky but will not pull loose.
4-116. PREPARATION AND INSTALLATION
OF RADOME EROSION SHIELD.
a. All paint must be removed by using appropriate paint remover or by sanding. (Epoxy-based paint
need only be roughened.) Any holes or dents in the structure must be filled with the appropriate repair material
and sanded. Clean the area to be covered, using MEK or equivalent.
b. Dry fit the erosion shield to the cleaned structure. Position identified "top" surface of erosion shield
on top surface of structure. Then adjust each side to provide equal distance from structure attachment line.
Smooth out any wrinkles. Apply 1/2" wide masking tape to the structure, next to the shield's trailing edge.
(Refer to Figure 4-31. View 1.)
c. Establish a reference line at the top and draw a pencil mark on the masking tape to correspond with
the center line mark on the inside of the erosion shield. Repeat at bottom and remove erosion shield from
structure. (Refer to Figure 4-31. View 2.)
d. To establish a trim line apply I " wide masking tape to butt against forward edge of the 1/2" wide tape
previously applied. Leading edge of 1 tape will now provide the final trim line. (Refer to Figure4-31. View 3.)
NOTE
Smaller erosion shields with a distance of less than 10" from the
center to the trailing edge may be installed by applying the 1/2"
masking tape approximately 1/4" beyond the shield trailing edge and
need not be final trimmed.
Added: 10/5/83
STRUCTURES
1H12