Thoroughly clean affected area using
methyl ethyl ketone, ASTM D 740.
cements and solvents utilized during
Apply a brush coating of sealing
compound, MIL-S-8802, approximately 1/32 inch thick
over clean area.
Allow sealing compound to dry until
no longer tacky.
remove brush marks and feather edges using abrasive
paper, 400 grit, Federal Specification P-P-101, or
Remove powdered sealing compound
with compressed air or a dry, clean cloth.
conductive cement to entire surface of shoe.
Deicing System Troubleshooting. A typical
troubleshooting chart for deicing systems is shown in
Deicing System Maintenance. Maintenance
of deicer system consists primarily of the care and
repair of deicing shoes and the replacement of defective
component parts The following paragraphs explain
general maintenance for deicing systems.
Patch installation Install patches using
the following procedures:
Thoroughly clean affected area,
using methyl ethyl ketone, ASTM D 740.
Buff affected area until
Clean buffed area with a clean
cloth completely dampened with methyl ethyl ketone.
Select a patch of ample size to
Apply one coat of Goodrich 60
cement, or equivalent, to damaged area and patch, and
allow to dry thoroughly (5 to 10 minutes).
surfaces with a cloth dampened with methyl ethyl
ketone, and apply patch to deicer shoe, starting at edge
and working down carefully to avoid trapping air beneath
Allow patch to set 15 minutes,
then wipe patch and surrounding area with methyl ethyl
Buff and clean a minimum area
of 1/2 inch around patch.
Apply a brush coat of sealing
Weather-checked surfaces and
abraded areas not requiring a
patch will be treated as outlined
in paragraph 9-14b.
Repair cuts, tears, and severe
scuff damage to tube or stretch
area with reinforced (one-way
Damage to nonstretch areas will
be repaired with plain neoprene
Cold patch limits. Limits for cold
patching are as follows:
Cuts up to one inch on deicer
shoes attached with fairing strips.
Cuts up to three inches in length
on deicer shoes attached with cement.
9-15. Fire Detection and Extinguishing Systems.
Fire detection and extinguishing systems are explained
in the following paragraphs.
a. Fire Detection Systems. The fire detection systems
are designed to detect the presence of fire in zones
such as engine compartment and combustion-type
heater compartment, and to light a red warning light in
the pilot's compartment in event of fire To detect fires or
overheat conditions, detectors are placed in the various
zones to be monitored. Fires are detected in aircraft
using one or more of the following: