ENSTROM 480B OPERATOR'S MANUAL
7-75
Rev.
15
Report No. 28-AC-023
Jul 12/10
SECTION XIII. MISCELLANEOUS SYSTEMS
7-77. Ignition Lock Switch
1. The ignition lock switch, located on the left side of
the center pedestal (Figure 7-12), must be in the
ON
(horizontal) position for engine start-up. The switch is
wired in the engine start circuit between the start relay
circuit breaker and the starter button. The switch must be
in the
OFF
(vertical) position to remove the key.
7-78. Hour Meter
1. The hour meter, located on the left side of the
center pedestal (Figure 7-12), records engine operating
time. The hour meter is powered by the aircraft 28-volt
electrical system through the
HR METER
circuit breaker
and is controlled by an oil pressure switch mounted in
parallel with the engine oil pressure transducer. On aircraft
prior to S/N 5134, the hour meter circuit is protected by
the
HR METER
fuse. Starting with aircraft S/N 5048, a
collective microswitch is incorporated into the hour meter
system. The hour meter in aircraft S/N 5048 and
subsequent records flight time.
7-79. Start Counter
1. The start counter, located on the left side of the
center pedestal, records when electrical power is supplied
to the engine ignition exciter. Start count information is
required for tracking life limited components of the engine.
The start counter is powered by the aircraft 28-volt
electrical system through the
IGN EXCITE
circuit breaker.
NOTE
Prior to serial number 5048, the start counter
is located next to the ignition exciter on the
engine.
Summary of Contents for 480B
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