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FOSTER AREA NAVIGATION
PILOT'S OPERATING HANDBOOK
(TYPE 511)
SUPPLEMENT
7.
WAYPOINT PUSHBUTTON (WPT) - Activates the waypoint data dialed into the
RIGHT side thumbwheels (8). When pressed, the WPT pushbutton lights to
indicate which waypoint is "active". The WPT pushbutton light intensity is
controlled by photocell (4).
8.
RADIAL AND DISTANCE THUMBWHEELS - Waypoint location (RADIAL and
DISTANCE) is dialed into thumbwheels to 0.1° and 0.1 NM resolution. Maximum
waypoint offset from the VORTAC is 199.9 NM.
9.
TEST PUSHBUTTON - Press to check proper calibration of RNAV 511. If the
computer is properly calibrated, the displays (2 & 6) read the "active" WPT
RADIAL and DISTANCE as dialed into the thumbwheels. Test may be performed
anytime, (during or before flight).
10.
LOCKING SCREW - Secures RNAV 511 in dustcover. Turn locking screw
counterclockwise several turns to release unit from panel.
11.
RADIAL AND DISTANCE THUMBWHEELS - Waypoint location (RADIAL
AND DISTANCE) is dialed into thumbwheels to 0.1° and 0.1 NM resolution.
Maximum waypoint offset from the VORTAC is 199.9 NM.
Figure 1. Foster Area Nav (Type 511) Computer Operating
Controls and Indicators (Sheet 2 of 2)
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1 July 1979
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PILOT'S OPERATING HANDBOOK
FOSTER AREA NAVIGATION
SUPPLEMENT
(TYPE 511)
SECTION 4
NORMAL OPERATION
VOR/LOC OPERATION
VOR NAVIGATION CIRCUITS VERIFICATION TESTS:
1.
See appropriate Nav/Com supplement.
AREA NAVIGATION OPERATING NOTES
1.
Proper RNAV operation requires valid VOR and DME inputs to the
RNAV system. In certain areas, the ground station antenna
patterns and transmitter power may be inadequate to provide valid
signals to the RNAV. For this reason, intermittent RNAV signal
loss may be experienced enroute.
2.
When a waypoint from one VORTAC is displaced over a second
VORTAC, interference from the second VORTAC sometimes
causes erratic and unusable BEARING and RANGE displays on
the RNAV at low altitude.
3.
The RNAV BEARING readout (to the waypoint) becomes
extremely sensitive and may become unusable within 1 - 1 1/2
miles of the waypoint. Thus, the RANGE readout is the primary
means of approximating waypoint passage.
4.
Tracking from a waypoint is not recommended since the pilot
would have to fly a reciprocal bearing and make error corrections
in the opposite direction from flying to a waypoint.
DIAGNOSTIC FUNCTIONS
All RNAV systems are rendered inoperative under certain conditions.
The RNAV 511 provides a Flag mode and permits a diagnostic interpreta-
tion of why the system is inoperative.
FLAG MODE INDICATIONS:
1.
Six "Bars" Appear in the Digital Displays (2 & 6):
a.
PRESS VOR/DME button (5) to determine if the VOR radial
signal is absent. If VOR radial signal is absent, bars will
change to show as "000" in the BEARING window (2). (One
possible cause of this condition could be that the NAV receiver
is channeled to a localizer signal.)
b.
Excess RADIAL waypoint address entry (11 or 8) such as
360.1° or 389° -- The computer will not accept this entry.
1 July 1979
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