iE90T400sLN
lIIGROUND
POWER
UNIT
CHAPTER
1
SECTION
2
OPERATION
1. CONTROLS
AND INDICATORS
Prior to operating
the
GPU,
personnel
must
become
thoroughly
familiar
with the operating
controls, indicators and
procedures
described
in this section.
Refer
to figure 1 for illustrated
control location and
functional description.
2. OPERATING PROCEDURES
A. Pre-Operationallnspection:
CAUTION
A PRIOR.TO.USE INSPECTION
MUST BE
PERFORMED BEFORE
EACH
OPER,ATION
TO ENSURE SAFE
AND
RELIABLE
OPERATION
OF THE
GPU. FAILURE TO
PERFORM
THE
PROCEDURES
LISTED BELOW MAY
RESULT IN
SEVERE DAMAGE
TO THE EQUIP-
MENT.
(1)
Enclosure:
Inspect
for
obvious
defects, i.e., security
of common
hardware.
(2)
Towbar: Excessive movement.
(3)
Brakes: Check brakes for
proper
operation.
(4)
Tires: Inspect tread wear, and check
tire inflation
(60
psig).
(5)
Engine hoses
and clamps:
Inspect for leaks
and security.
(6)
Radiator Coolant: Open forward canopy.
Observe level of coolant in overflow
container.
Coolant
should be
near the
full
line.
Service as required
(Refer
to
Section 2-2, Servicing).
(7)
Oil
level: Open left front
access door.
Check that oil
level is at the full mark
on
the dip stick,
(Refer
to section 2-2,
Servicing).
(8)
Fuel
level: Set IGNITION
switch to
ON
position,
observe reading on fuel
gauge.
Service
with fuel as necessary.
(9)
Engine Assembly:
Visually
inspect fuel lines and
fittings
for
evidence
of fuel
leakage. lnspect valve
cover, oil
pan,
and cylinder
block for
evidence of oil
leakage.
(10)
Fan Belt: Visually inspect
for wear and cracking.
Check
belt for
proper
tension.
(11)
Air Filter
(Minder):
Check
Filter Minder@ Indicator located to the left
of the right
front
access door, under
the air filter assembly.
Replace
air filter if
a
reading
of
25 or higher
is
noted
(engine
running). Recheck when unit is running under
load.
(12)
Ether Start
(Optional):
Check
ether start supply cylinder
installation for
operational readiness.
January
15, 1999
Original
1-2
Page 1
Property of American Airlines
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