BendixKing KMH 920 System KMH 980 - Manual (Page 36)

Rev 2
KTA 970/KMH 980 Pilot’s Guide
006-18273-0000
TCAS I System Considerations
28
LIMITATIONS AND NOTES
LIMITATIONS
Refer to the Airplane Flight Manual.
NOTES
The capability of TCAS I is dependent upon the type of transponder
in the Intruding aircraft:
The Intruding aircraft must be equipped with a properly operating
transponder for normal TCAS I operation. TCAS I is unable to detect
any aircraft without an operating transponder.
If the Intruder is Non-Altitude Reporting (NAR), TCAS I will display
only the range and bearing. It can issue a TA (Traffic Advisory)
based on distance and direction of flight. TCAS I assumes Non-
Altitude Reporting (NAR) traffic is at the same altitude as your own
aircraft.
Options for TCAS I also include the following:
* The maximum number of targets displayed (3 - 30) can be selected
via the configuration module.
* The TCAS I display may have pilot selectable range or may be a
fixed range controlled by the aircraft wiring.
* The TCAS I system can be automatically placed in standby when
the aircraft is on the ground.
* The manually initiated system self test can be inhibited in flight.
* TCAS I can be wired to give EGPWS and Wind Shear a higher
aural warning priority.
If a radio altimeter is installed, the TCAS I aural warning (TRAFFIC,
TRAFFIC) is inhibited below 400 feet AGL during descent and below
600 feet during ascent. If no radio altimeter is installed, then the
aural warning is inhibited whenever the Landing Gear is EXTENDED.
It is possible to see an aircraft flying the same course and direction
as your own aircraft, yet TCAS I may not consider it a threat. TCAS I
calculates the closure rate of the Intruder, and derives the time to the
Closest Point of Approach (CPA). If there is no closure rate, no advi-
sory will be issued, unless the Intruder is very close (within approxi-
mately 0.2 mile). Conversely, traffic at the same altitude very far
ahead (about 10 miles) may be shown as a TA by TCAS I because
of a very rapid closure rate.
On a bottom monopole antenna installation, the TCAS I bearing and
display of a Non-Altitude (NAR) aircraft may appear erratic when the
intruding aircraft is close in range but distant vertically. This may make
the NAR traffic symbol momentarily disappear or move around the
TCAS I display. The range distance for the NAR will be accurate but the
intruder may be well above or well below your aircraft. Use NORMAL
visual scan techniques to scan for this and other intruding aircraft.