8
PILOT'S OPERATING HANDBOOK
FOSTER AREA NAVIGATION
SUPPLEMENT
(TYPE 511)
SUPPLEMENT
FOSTER AREA NAVIGATION
SYSTEM
(Type 511)
SECTION 1
GENERAL
The Foster Area Navigation System (RNAV - Type 511) consists of a
511 Area Nav Computer, a compatible VHF navigation receiver, a DME
Adapter Module and DME.
The RNAV 511 is a basic Area Navigation Computer with two thumb-
wheel programmable waypoints. It performs continuous computation of
triangulation problems.
The
VOR
and DME equipment in the aircraft provides information to
the computer on aircraft position relative to the VORTAC station. A
waypoint is dialed into one set of waypoint thumbwheels by inserting the
RADIAL and DISTANCE of the waypoint (the position the pilot would like
to fly over, or to) relative to the VORTAC station. The RNAV 511 computer
calculates the Magnetic Bearing (BEARING) and Distance (RANGE NM)
from the aircraft to the waypoint repeatedly to provide continual informa-
tion on WHICH WAY and HOW FAR to the waypoint.
The pilot can monitor BEARING and RANGE on RNAV 511 to fly
straight line paths to waypoints up to 200 NM distance from the aircraft
position. Waypoints can be precisely dialed into the thumbwheels to 0.1°
and 0.1 NM resolution.
The RNAV 511 also provides immediate position orientation relative
to the VORTAC (VOR/DME) station being used for computation. Merely
press the V OR/ DME pushbutton to display the RADIAL and DME distance
from the VORTAC.
Another feature of the RNAV 511 is its ability to provide evidence of
proper computation in the system. The system can be tested at anytime
before flight or while airborne to confirm proper computer operation. An
acceptable "test" is evidenced by the active waypoint
'
s RADIAL/DIST-
ANCE being displayed in the BEARING and RANGE windows of the
RNAV 511 while TEST pushbutton is pressed. In addition to the "test"
feature, diagnostic functions are provided to alert the pilot of why the
system is not functional.
1 July 1979
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