Honeywell International Inc. KSN770 Manual De Usuario
Draft
Page 3-45
6 Dec 2012
34-70-06
SYSTEM INSTALLATION MANUAL
066-01204 / 066-01213
© Honeywell International Inc. Do not copy without express permission of Honeywell.
The KSN 7xx can be configured to receive RS-232 serial air data in one of two different formats:
• Format C-Fuel and Airdata
• Format D-Fuel and Barometric Airdata.
The format of the RS-232 data can be configured in the Maintenance pages.
Barometric altitude information is used for aiding the GPS receiver in acquiring and tracking its
position, ensuring the accuracy of RAIM calculations (outside of SBAS coverage),for altitude
alerting functions, and for advisory VNAV calculations.
position, ensuring the accuracy of RAIM calculations (outside of SBAS coverage),for altitude
alerting functions, and for advisory VNAV calculations.
True airspeed is used to compute winds aloft.
C.
Fuel Flow
The KSN 7xx may be interfaced to fuel flow systems with a separate fuel flow indicator for
enhanced flight planning.
enhanced flight planning.
3.9.3
Requirements and Limitations
A.
Altitude/Airdata
A source of true airspeed is optional. With an airspeed input, an automatic winds aloft calculation
is provided. True airspeed may be entered manually when it is not provided electrically.
is provided. True airspeed may be entered manually when it is not provided electrically.
A source of barometric altitude is required for GPS installations certified for IFR.
The KSN 7xx accepts analog altitude inputs which utilize DC excitation only. Certain aircraft are
wired to excite altimeters with 400 Hz AC, and the KSN 7xx is not compatible with these
installations.
wired to excite altimeters with 400 Hz AC, and the KSN 7xx is not compatible with these
installations.
The KSN 7xx DC altitude resolution is such that you may see as much as 200 feet (61 meters) of
error between the altimeter and the altitude displayed on the KSN 7xx. This performance is
acceptable for aiding the GPS receiver, but is marginal if VNAV or altitude alerting are to be used.
error between the altimeter and the altitude displayed on the KSN 7xx. This performance is
acceptable for aiding the GPS receiver, but is marginal if VNAV or altitude alerting are to be used.
Some Airdata computers require up to ten minutes warm-up time. This can result in an ALTITUDE
FAIL message on the KSN 7xx during the Airdata warm-up period. Connecting to a gray code
altitude source that does not require warm-up will prevent this message as the KSN 7xx will revert
to the gray code source until the airdata becomes valid.
FAIL message on the KSN 7xx during the Airdata warm-up period. Connecting to a gray code
altitude source that does not require warm-up will prevent this message as the KSN 7xx will revert
to the gray code source until the airdata becomes valid.
B.
Fuel Flow
The KSN 7xx receives fuel flow information from external equipment over the
AIRDATA/FUEL/HDG 232 RX bus. It can receive one fuel flow from each of up to two engines.
AIRDATA/FUEL/HDG 232 RX bus. It can receive one fuel flow from each of up to two engines.
Draft as of 10/15/2012