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warning, and advisory system. These displays provide indicator. This indicator displays altitude MSL, and
all necessary information for day or night VFR flight uses the static air pressure system for measuring
and to conduct emergency instrument flight. altitude. Electrical power for an internal vibrator is
received through the 28 Vdc power assured bus and is
a. Primary Flight Displays. All primary flight protected by the AIR DATA circuit breaker (fig. 2-8).
information is displayed on either MFD when the Adjusting the barometric pressure setting on this
vertical situation display (VSD) mode is selected instrument also provides barometric pressure correction
(Chapter 3). PITCH and ROLL switches, located on for the primary altimeter on the VSD. No system
MFD auxiliary control panel (fig. 2-6), adjust attitude warmup time is required before adjustments can be
indicator display. The basic flight display is an attitude made; however, electrical power must first be applied
indicator displayed in the center of the screen. Around from the power assured bus.
the attitude indicator is displayed an airspeed indicator,
heading indicator, barometric altimeter, radar altimeter, (4) Standby Magnetic Compass. A standby
vertical speed indicator, present position readout, and magnetic compass (6, fig. 2-6) is located on the far
distance to waypoint reading. An air data subsystem is right side of the instrument panel. A compass
incorporated which compensates for the effects of correction card is located adjacent to the compass.
temperature and barometric pressure to improve the c. Slip Indicator. A slip indicator is located on the
accuracy of the barometric altimeter and airspeed pilot MFD auxiliary control panel (8, fig. 2-6) to indicate
indications on the VSD display. A submode of the VSD slip/skid (trim) conditions in flight. This is a ball-in-race
is the hover (HVR) mode (Chapter 3). This mode is type indicator that requires no electrical power.
used to aid in hovering at night or in reduced visibility.
Refer to Chapter 3 for detailed description of all
instrument readouts of the VSD and HVR modes. 2-83. MISCELLANEOUS INSTRUMENTS.
b. Secondary Flight Instruments. Several a. Free Air Temperature Indicator. The free air
secondary flight instruments are located on the temperature indicator is located at the top center area
instrument panel to provide flight reference in the event of the windshield and displays free air temperature in
of a partial or complete failure of the primary instrument degrees Celsius.
system. The secondary flight instrument group contains
a standby attitude indicator, standby airspeed indicator, b. Clock.
standby altimeter, and standby magnetic compass. An 8-day mechanical clock (5, fig. 2-6) is located on
(1) Standby Attitude Indicator. A standby the instrument panel to the right of the pilot MFD. The
attitude indicator (1, fig. 2-6) is located on the clock has a push knob in the upper right corner for
instrument panel. An OFF flag is exposed in the event setting elapsed time and rewind knob in the lower left
of instrument failure. Power to the instrument is corner.
received through the battery emergency bus and the A digital quartz time base, electronic clock (5, fig. 2-6)
circuit is protected by the STBY ATT circuit breaker is located on the instrument panel to the right of the
located on the overhead console (fig. 2-8). The standby pilot MFD. The clock indicates hours, minutes and
attitude indicator should be caged prior to placing the seconds for clock time and elapsed time modes in six
ESNTL BUS switch in RUN by pulling the PULL TO digit, twenty-four hour numeric display in addition to a
CAGE knob. sweep second, analog indicator (fig. 2-24). The clock
(2) Standby Airspeed Indicator. A standby includes a keep alive function, provided by an internal
airspeed indicator (20, fig. 2-6) is located to the left of battery to keep timing circuits continuously operating
the standby attitude indicator. This instrument while aircraft power is not applied.
measures knots indicated airspeed (KIAS) from 0 to
2-53
TM 1-1520-248-10
60
20
45
50
55
35
40
25
30
5
10
15
SEL CTRL
1 3 2
4
5
6
7
8
406961-1391
J0130
CONTROL/INDICATOR FUNCTION
1. SEL Set clock mode Depressed will flash for selection of hours, minutes, and
seconds for changes. Returns clock to clock function.
Clock mode Depressed to change to elapsed time mode.
Elapsed time mode Depressed to change to clock mode.
2. CTRL Set clock mode Depressed to increment hours, minutes, and seconds.
Elapsed mode Depressed:
1st time Starts elapsed timer
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(29)
