1111111
••••••
DC POWER LOSS - ESSENTIAL BUS
(Aircraft
35-067
thru
35-201,
35-205,
and
aircraft
36-018
thru
36-040
except
when
these
aircraft incorporate
AMI(
78-13)
(CONT)
If ESS BUS Circuit Breaker
Does
Not Hold:
4.
Wait
at
least
one
minute before attempting reset.
If ESS BUS Circuit Breaker Holds After
Being
Reset:
5.
Add
loads only as necessary for safe operation.
Do
not
reset
the
open
ES5
BUS
TIE
Circuit Breaker.
'If
ESS BUS
Circuit
Breaker
Opens
Again:
6. Essential Bus Electrical Load - Reduce as follows:
a. AUTOPILOT Switch -
OFF.
b. Select
PH
on
both audio panels
(use
headphones for communi-
cation).
c. Instrument panel light rheostats -
OFF
if
conditions pennit.
d. Restrict operation of the following systems
to
one
at a time.
(1) Pitch,
roll
and yaw trims.
(2) Communication transmissions.
(3) Fuel transfer and standby pumps.
(4) Raps.
(5) Landing Gear.
e. Pull
the
follOwing
circuit breakers on the failed essential bus.
(l)
COMM.
(2)
S
WARN
HT.
(3)
PITOT HT.
(4)
Yaw
damper.
f.
Select the following primary
or
secondary systems for opera-
tion from the remaining essential bus.
(I)
Pitch trim.
(2) ATC transponder (if dual).
(3)
COMM 1
or
COMM 2.
(4)
Yaw
damper.
g.
ESS
BUS
TIE
Circuit Breaker (copilot's panel) - Reset.
E~
Cross-check airspeed/Mach, altitude and angle-of-
attack displays against opposite system on frequent ba-
sis. Use reference from system
on
remaining essential
bus if differences exist and icing conditions are present.
FAA APPROVED 4-30-76
REISSUED
2-25-81, CHANGE
10
3-5
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