Beechcraft TRAVEL AIR 95 Shop Manual page 105

TROUBLE PROBABLE
CAUSE
CORRECTION
6.
Cycling valve automatic
a.
Cycling valve
out of
a. Adjust
the
cycling valve
return functions
before
de-
adjustment.
"pop-off"
pressure,
icers are fully inflated
or
inflation cycle is longer
than
5
to
9 seconds.
ENGINE-DRIVEN DEICER
(TAVCO OR
GOODRICH
VALVES)
The
following troubleshooting
procedures are based on
the
assumption
that the
aircraft
engine-driven
vacuum
pumps
and
the
aircraft
electrical system
are operational.
TROUBLE PROBABLE CAUSE
CORRECTION
1. Deicer boots do not inflate a.
Open
circuit breaker. a.
Push deicer circuit
breaker
to
(either or
both engines reset,
operating at minimum
cruise
rpm for a period b. Loose
electrical
connection b. Tighten or repair
as required,
of
eight seconds). or broken wire.
c.
Timer not functioning. c.
See
Component Maintenance and
Replacement, Timer.
d.
Control valves
not func-
d. See system
Checkout,
Control
tioning.
Valves,
e. Control valve poppet e. See Component Maintenance and
sticking.
Replacement,
Control
Valves.
f
.
Piping lines
kinked,
blocked,
f
.
Inspect lines
and
connections;
or not connected. blow out lines.
g.
Leak
in
system.
g. See
System Checkout,
Air Leakage
Test.
2. Deicer boots
inflate
too
a.
Piping
lines kinked,
par-
a. Inspect lines and connections;
blow
slowly (either or both
blocked,
or not connected out lines.
engines operating
at securely,
minimwn cruise
rpm
for a period
of
eight b.
Leak in system.
b. See System Checkout Air Leakage
seconds)
.
Test.
c. Shuttle
Valve not func-
c. Check fitting
in shuttle valve
deicer
tioning.
port
for
proper installation
(Good-
rich control
valves only)
,
d.
Deicer
boot puncture.
d. Repair as prescribed in
Part
III
of
this
amendment or replace.
3. Deicer boots do not deflate.
a. Pilot
pressure and priority a.
Install each
line between
pilot
pressure lines
improperly port
of one
valve
assembly
and
installed (Tavco
control priority
port
of opposite
valve
valve assemblies
only)
.
assembly.
4. Deicer boots deflate
too
a. Defect in aircraft vacuum
a. See
Vacuum System,
this
manual.
slowly.
system.
b.
Clogged air
filters
(Good-
b.
See Component
Maintenance
and
rich
control
valves only)
.
Replacement, Air Filters,
c. Piping
lines kinked or
c.
Inspect
and
blow
out lines.
partially
blocked.
3-72