Table 3-2. Various Values For UTM Grid Coefficients
Universal Transverse Mercator
Grid Technical Manual
TM 5-241-8, Headquarters
Department of the Army.
30 April 1973, page 4
Flatness Coefficient:: 100 (1/f)
Relative Radius: a-6,3700.000
(4) Abbreviated INS Interface Test As required.
Assuming a level aircraft, attitude
indicators will become level during
alignment state 8 and remain level in
all modes until INS is shut down.
Warning indicators for INS attitude
signals from the INS are valid while
attitude sphere display is level.
The INS can provide test signals
Indicator (HSI) and connected
displays. Pressing TEST switch
during STBY, ALIGN, or NAV
indicate 8's, and illuminates the
WYPT on the pilot's HSI and the
ALERT annunciator. Additional
HSI test signals are provided
when INS is in ALIGN and data
selector is at any position other
than DSRTK/STS. Under those
conditions, pressing TEST switch
causes HSI to indicate heading,
drift angle, and track angle error,
all at 0° or 30°. At the same time,
cross track deviation is indicated
at 3.75 nautical miles (one dot)
right or left and INS-controlled HSI
flags are retracted from view.
Output test signals are supplied to
the autopilot when INS steering is
selected. Rotating AUTO/MAN
switch to AUTO and pressing
TEST during alignment furnishes
a 15° left bank steering command.
AUTO/MAN switch is set to MAN.
The autopilot will not engage until
after the CDU test switch is
pressed and the NAV flags are
pulled out of view.
The quick test procedure may be
alignment state 8 is reached and
prior to entry into NAV.
1. Mode selector (MSU) - ALIGN.
Observe CDU displays are illuminated.
2. Data selector (CDU) DSRTK/STS. Monitor
right data display until state 8 (or lower) is
reached. Observe right data display is ---N4,
where N is not 9.
3. AUTO-MAN switch (CDU) - MAN.
4. Data selector Set to any position except
5. CDU test switch - Hold depressed.
6. INS Couple to flight director and autopilot, as
After performing the preceeding step, observe:
a. All annunciators in MSU Check
b. All annunciators in CDU - Check