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readout should be disregarded. Simultaneously, left
engine and right engine digital readouts appear in the
left upper corner of the panel for FWD and AFT cell
fuel quantity. The CPG engine instruments are tested
by pressing the TEST pushbutton on the SDD panel
which causes all vertical-scale readings to be fully illuminated,
and all digital displays to indicate 888. The
engine instrument test panel (fig 2-20) also has the capability
of testing the CPG engine instruments by selecting
the TST position of the DGT/OFF/NORM/TST
switch. In this position all vertical-scale displays will be
fully illuminated and the digital displays will indicate
888. Selecting the DGT OFF position will blank all
CPG digital displays.
Figure 2-21. Selectable Digital Display Panel
2.33 ENGINE CAUTION/WARNING ANNUNCIATORS.
All cautions/warnings for the engines have been discussed
in this section. These caution/warning segments,
and their fault indicators, are summarized in
Section XIV, tables 2-5 and 2-6. It should be noted that
the CPG caution/warning panel has fewer segments
than the pilot caution/warning panel and that specific
faults are often not displayed. Illumination of any one
of the pilot caution/warning segments that indicates an
engine problem will simultaneously illuminate the
CPG ENG 1 or ENG 2 segment.
2.34 ENGINE HISTORY RECORDER 701
An engine history recorder is mounted to the forward
right side of the engine 701 (fig 2-16). Signals are sent
to the history recorder by the ECU. The recorder displays
two readouts of low cycle fatigue (LCF) events, a
time temperature index, and engine operating hours.
These readouts cannot be reset to zero. The engine history
recorder is present only on the -701 engine.
2.35 ENGINE HISTORY COUNTER 701C
An engine history counter is mounted to the forward
right side of the engine 701C (fig 2-16). Signals are sent
to the history counter by the DECU. The counter displays
two readouts of LCF events, a time-temperature
index and engine operating hours. These readouts cannot
be reset to zero. The engine history counter is present
only on the -701C engine.
2-33
TM 1-1520-238-10
Section IV. FUEL SYSTEM
2.35 FUEL SYSTEM.
The fuel system provides fuel and fuel management
provisions (fig 2-22) to operate both engines and the
APU. Fuel is stored in two crash-resistant, self-sealing
fuel cells one forward and one aft of the ammunition
bay (fig 2-23). Fuel may be transferred from either cell
to the other. The system is also equipped to crossfeed
(select which fuel cell supplies fuel to the engines). The
helicopter has provisions for carrying either two or four
external fuel tanks on the wing pylon attach points. Approved
primary fuel grades and acceptable alternates
are listed in Section XV, table 2-8.
Figure 2-22 Pilot Fuel Control Panel
Figure 2-22.1 Pilot Fuel Control Panel
(Modified)
2.36.1 Pilot Fuel Control Panel. Table 2-1 outlines
the effects of switch settings on the pilot fuel control
panel (fig 2-22). Some fuel control panels have been modified
with switch barriers located on the ENG 1 and
ENG 2 fuel switches (fig 2-22.1). The following paragraphs
contain a description of fuel system provisions
controlled by the panel.
a. Fuel Switch. Two switches, ENG 1 and
ENG 2, control the activation of the crossfeed shutoff
valves. In order for fuel to flow to the engines (or crossfeed
to the opposite engine if selected), the respective
fuel switch must be ON. When in the ON position, the
crossfeed switch is enabled. This controls the positioning
of the crossfeed valve.
l The crossfeed switch shall be set to
the NORM position at all times, in
flight, unless executing emergency
procedures for FUEL PSI ENG 1
and FUEL PSI ENG 2 warning advisory.
A malfunctioning crossfeed
valve could result in a single engine
flameout.
l Do not switch directly from AFT
TK to FWD TK crossfeed (or FWD
TK to AFT TK) without pausing for
at least 15 seconds in the NORM
position to ensure both valves are
sequencing to their proper positions.
Failure to follow this procedure
may result in a dual engine
flameout if one of the crossfeed
valves fails to properly position.
b. Crossfeed Switch. This switch simultaneously
controls the position of both crossfeed/shutoff valves.
Three discrete positions, FWD TK NORM and AFT
TK allow the pilot to select the fuel cell(s) to feed both
engines. The NORM setting feeds the No. 1 engine
from the forward cell and the No. 2 engine from the aft
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