TM 1-1510-223-10
Change 3 3-69
(5) Pattern steering using INS. Pattern steering
provides a box or straight line pattern which may be used
to fly the aircraft in a specific pattern. The pattern will
originate at the current TO waypoint. The length of the
base leg, true bearing of the pattern, offset distance of
the return leg, and direction of the turns are loaded into
the computer via the ASE/ACS. Should the operator
specify a zero offset distance for the return leg, the direc-
tion of the turns will alternate at each end of the pattern.
A waypoint change to 00 will cause the computer to
enter the pattern steering mode. The coordinates for
waypoints 1, 2, 3, and 4 will be saved and replaced with
computed waypoints for the pattern. Waypoints 0 and 4
will be the initial point (IP) for the pattern. The differences
between the pattern steering mode and the normal steer-
ing mode are:
Automatic leg switching will occur when directly over
the destination waypoint.
Leg switching can only be accommodated automati-
cally. If MAN leg changing was specified on the INS SET-
UP page, the aircraft will continue on the same path with
a flashing WAYPOINT ALERT lamp until leg changing is
changed to AUTO on the MFD.
The approach to the base or return legs will be at 90
degrees versus the normal approach of 45 degrees.
The program is designed to overfly all waypoints with
a minimum of overshoot, provided sufficient distance to
the return leg has been entered. When coupled to the au-
topilot, up to three maximum bank turns may be com-
manded while performing the 180 degree return.
The pattern steering mode is exited when the opera-
tor inserts a valid non 00 leg switch command. The origi-
nal set of four waypoint coordinates will be returned to
their former location.
d. Normal Operating Procedures.
(1) Preflight procedure.
(a) GPU - Connected.
(b) Battery Switch - ON.
(c) Overhead and mission panel switches -
Set as follows:
1. Aircraft
#1
and
#2
INVERTER
switches - ON.
2. AUTO PLT POWER switch - ON.
3. AVIONICS MASTER POWER switch
- EXT PWR.
4. #1 and #2 EFIS POWER switches -
ON.
5. #1 and #2 three phase inverter
switches - RESET/ON.
6. BUS CROSS TIE SWITCH - AUTO.
7. ATT push-button selector switch (dis-
play controller) - Depress as required.
8. Autopilot EFIS 1/2 switch - EFIS 1.
(2) INS Alignment. Align as follows:
(a) Mode switch B (MFD) - Depress to select
FPLN page.
(b) NAV SETUP (R5) - Depress.
(c) INS SETUP (R5) - Depress.
(d) INS mode selector - STBY. (Text at L1 will
be blank until the INS mode selector is placed in STBY
or ALIGN. Then 1. LAST ALIGN and 2. LAST KNOWN
text will appear.
(e) Present position - Enter by one of these
methods:
1. To accept LAST ALIGN coordinates,
SKPD 1, then depress L1.
2. To accept LAST KNOWN coordinates,
SKPD 2, then depress L2.
3. SKPD alignment coordinates, then
depress L1.
4. If using the Data Transfer System,
load the present position by depress-
ing SETUP DATA L5 in the desired
data set on DATA TRANSFER page.
NOTE
When L1 is depressed INS LOADING will ap-
pear at the top of the MFD and L1 text changes
to ALIGN = X.DD.MM.SY.DDD.MM.SS and
ALIGN STATE 9. It takes 6 to 8 minutes for the
program to load.
Valid
alignment
data
for
LAT/LONG
is
X.DD.MM.SS.T.YY.DDD.MM.SS.T where:
X = Latitude hemisphere (N or S)
DD = Degrees of latitude (0 - 90)
MM = Minutes of latitude
SS = Seconds (0 - 59)
T = Tenths of seconds (0 - 9)
Y = Longitude hemisphere (E or W)
DDD = Degrees of longitude
