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2nd time Stops elapsed timer
3rd time Resets elapsed timer
4th time Repeats cycle (starts elapsed timer).
3. SEL CTRL Pressed simultaneously to set clock.
4. Hours Two place numerical twenty-four hour display.
5. Minutes Two place numerical minutes display.
6. Seconds Two place numerical seconds display.
7. Sweep second hand Analog indicator for seconds.
8. ETC Mode indicator ET for elapsed time or C for clock.
Figure 2-24. Digital Clock
2-54
TM 1-1520-248-10
Figure 2-25. Warnings, Cautions, and Advisories
2-84. (CDS2/CDS3) WARNING, CAUTION, AND FADEC FAIL
ADVISORY SYSTEM. FADEC MANUAL
The warning, caution, and advisory system visually and When activated, a unique FADEC audio warning,
audibly advises the crew of specific faults in the consisting of a high/low tone is generated. This high/
helicopter systems. All warning, caution, and advisory low tone sequence is repeated until acknowledged or
messages are displayed on both MFDs and warnings the condition has been removed.
and cautions are accompanied by an audio tone that is
heard through the crew headsets. (2) Refer to Chapter 9, Emergency Procedures
for corrective action for each of these warnings. As a
a. Warning Function. Warning messages are warning condition occurs and the warning is displayed,
displayed in a box in the upper right corner of the MFD warning audio will sound. Except for LOW RPM
screen (fig. 2-25). This box will display only when there ROTOR, which has a continuous whoop, a continuous
is an active warning condition. There are seven 3 bongs per second signal will sound. The audio signal
warning messages that can be displayed: can be silenced by pressing the REC/ACK (recall/
acknowledge) switch (3, fig. 2-9) on the MFK to the
ENG OVER TRQ ACK position. The message will remain displayed on
ENGINE OUT the MFD as long as the warning condition is active. The
one exception is when the helicopter is at an ON
HIGH RPM GROUND condition. On the ground, the LOW RPM
(CDS3) LOW FUEL PRES ROTOR and ENGINE OUT warnings can be deleted
from the screen by pressing the REC/ACK switch a
LOW RPM ROTOR second time. All warning messages are recorded in C/
TGT OVER TEMP W (Caution/Warning) HISTORY, except when an ON
GROUND condition exists. If an ENGINE OUT or
XMSN OVER TRQ (CDS3) LOW FUEL PRES condition occurs, the
(1) (CDS3) In addition there are two warnings for following warnings will not be recorded on C/W
the FADEC system that are displayed as advisories: HISTORY:
2-55
TM 1-1520-248-10
ENG OVER TRQ CHIPS ENG FREEWHEEL
TGT OVER TEMP CHIPS ENG LOWER
XMSN OVER TRQ CHIPS ENG UPPER
b. Caution Function. All caution messages are CHIPS T/R GRBX
displayed in either of the two boxes that will display CHIPS XMSN SUMP
across the bottom of the MFD screen (fig. 2-25). These
CHIPS XMSN UPPER
boxes display only when there is an active caution or
advisory message that has not been acknowledged or DC GEN FAIL
has been recalled. Refer to Chapter 9 Emergency EGI FAIL
Procedures for a list of, and corrective actions to be
taken for, these conditions. When the caution condition * ENG TRQ TIME LIM [ ]
occurs, the caution message displays the word FUEL BOOST FAIL
CAUTION in the upper left portion of the screen and a
one “bong” per second audio signal will sound in the (OH-58D) FUEL CONT
crew headsets. The total number of active cautions will FUEL FILTER BYP
display to the right of the letter “C” on the bottom of
the screen. Pressing the REC/ACK switch on the MFK FUEL LOW
(fig. 2-9) one time to the ACK position will delete (CDS2) GPS DIVERGENT
CAUTION from the screen and silence the audio.
Pressing the switch a second time will delete the HIGH OIL PRESS ENG
messages from the screen if there are five or fewer HIGH OIL TEMP ENG
active caution and/or advisory messages. If there are
HIGH OIL TEMP XMSN
more than five active messages, (number of messages)
MORE MESSAGE will display on the last line of the HIGH TEMP T/R GRBX
right box. In this case, pressing the REC/ACK switch a * HIGH TGT TIME LIM [ ]
second time will display the remaining messages, up to
five. This continues until all active messages are HOT BATT 1
displayed. All messages will be stored in memory and HOT BATT 1 & 2
can be recalled by pressing the REC/ACK switch to
REC position. Caution messages have priority over HOT BATT 2
advisory messages and will precede them on the IFF FAIL
display list. All caution messages are recorded in C/W
HISTORY except when an ON GROUND condition IFF MODE 4 FAIL
exists. If an ENGINE OUT or (CDS3) LOW FUEL PRES INS FAIL
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(30)