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attitude indicator operates from a separate gyro. If either
the pilot or the copilot gyro fails, signaled by the OFF flag
on the indicator, manual switching to the remaining gyro
is accomplished by placing the respective VGI switch to
EMER. The switching of the gyros from NORM to EMER
operation is accomplished by a gyro transfer relay. Failure
of the gyro will also result in failure of the associated
AFCS. Power is supplied by the No. 2 DC bus through the
NAV CONT VGI circuit breaker on the No. 2 PDP.
2-14-18. Turn and Slip Indicator (4-Minute Type).
Each turn and slip indicator (fig. 2-1-7 and 2-1-9) is controlled
by an electrically actuated gyro. The instrument
has a pointer (turn indicator) and a ball (slip indicator).
Power to operate the gyros is supplied by the DC essential
bust through the NAV TURN & SLIP circuit breakers
on the No. 1 and No. 2 PDP.
2-14-19. Magnetic Compass.
The magnetic compass is mounted on the top of the
center instrument panel glareshield (fig. 2-1-3). It is a
direct reading instrument requiring no electrical power. It
consists of compass card mounted on a magnetic element
in a liquid-filled bowl.
2-14-20. Free Air Temperature Gauge.
The free air temperature gauge is on the exterior of the
pilot’s eyebrow window (fig. 2-1-3). The unit is calibrated
in degrees from -70 to + 50
C.
TM 1-1520-240-10
2-14-7
2-14-21. CHRONOMETER.
Two digital clocks labeled CHRONOMETER are located
on the copilot and pilot instrument panels (fig. 2-14-4).
Each clock has a six-digit GMT (greenwich mean time)
display and four-digit selectable display. A test mode is
provided to check system. A flashing annunciator identifies
which clock mode has been selected. There are
three controls on each clock, a SELECT button, a CONTROL
button, and a DIM switch.
Figure 2-14-4. Chronometer
a. SELECT Button. It allows the selection of any of
three modes on the four-digit display: GMT, LT (local
time), or ET (elapsed time). The six-digit display shows
GMT only.
b. CONTROL Button. It is used to set the time selected
on the four-digit display. When the CONTROL and
SELECT buttons are pressed simultaneously, the fourdigit
display is changed from the normal to the time set
mode, and the CONTROL button is functional.
c. DIM Control Switch. It is used to set the light
intensity of the display. At low light settings, the clock
display is NVG compatible.
Integral alkaline batteries maintain clock operation when
no aircraft power is applied, but the CONTROL and SELECT
buttons are disabled. Power to operate the chronometers
is supplied by the DC essential bus through the
CPLT CLOCK and PLT CLOCK on the No. 1 PDP and
No. 2 PDP.
2-14-22. Normal Operation - CHRONOMETER.
2-14-23. Setting GMT.
Press the SELECT button until GMT is selected. Simultaneously
press both the SELECT and CONTROL buttons
to enter the set mode. The tens of hours digit will start
flashing and the CONTROL button has full control of the
flashing digit. Each time the CONTROL button is pressed
, the flashing digit will increment. Once the tenth of hours
is set, pressing the SELECT button will select the next
digit to be set. After the last digit has been selected and
set with the CONTROL button, press the SELECT button
to exit the set mode. The annunciator will resume its
normal flashing condition to indicate that the GMT clock
is running.
2-14-24. Setting LT.
Press the SELECT button until LT is selected. Simultaneously
press both the SELECT and CONTROL buttons
to enter the set mode. The tens of hours digit will start
flashing and CONTROL button has full control of the
flashing digit. Use the same sequence as for setting GMT
with the exception that the minutes are already synchronized
with the GMT clock and can not be set when in LT
mode.
2-14-25. Setting ET.
The elapsed time allows for count up or count down
modes.
a. Count Up. Press the SELECT button until ET is
selected. Press the CONTROL button to start count up
sequence. The clock will count up to 59 minutes, 59
seconds and then changes to hours and minutes. It will
count up to 99 hours and 59 minutes. Pressing the CONTROL
button again resets the ET to zero.
b. Count Down. Press the SELECT button until ET
is selected. Simultaneously press both SELECT and
CONTROL buttons to enter the set mode. A count down
from any time, not to exceed 59 minutes and 59 seconds,
can be set using the same sequence as for setting GMT.
Once the last digit is set, pressing the SELECT button
exits the set mode and the clock is ready to start count
　
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