User Manual

maintenance 523-0 809018
Display Range (approx) Display Aural
12 nmi Other Traffic Symbol None
8 nmi TA Symbol TRAFFIC, TRAFFIC
6 nmi RA Symbol CLIMB, CLIMB
At a range < 6 nmi Verify that no increase climb advisory is issued. An RA should be
maintained, but which RA being issued can change. This test passes as
long as it is not an increase climb advisory.
4.9.2.5.7. Scenario 3c: Climb Inhibit. Scenario 3c can only be run if the "Climb Inhibit" discretes are connected and can be
stimulated. This t est is intended to ensure TCAS properly recognizes the climb inhibit input (1500 ft/min cl imb inhibit). Follow the
same steps as SCENARIO 3a except as follows:
a. Configure the airplane as needed to enable the 1500 ft/min climb inhibit co ndition. This may require a change to both the
altitude of the own aircraft, and the altitud e of th e target aircraft. If the alti tude of this test is greater than 20000 ft, the ranges
in the following step will be off. Also, the TA and the RA will occur sooner than indicated.
b. Monitor the TCAS display and audio system for correct presentation as follows (NOTE 1):
Display Range (approx) Display Aural
12 nmi Other Traffic Symbol None
8 nmi TA Symbol TRAFFIC, TRAFFIC
At a range < 8 nmi RA Symbol See Below
Ve rify no climb or increase climb advisory i ssued.
NOTE
An RA should be issued at about 6 nmi, and that it is possible that there is a change in which RA is being issued
inside of 6 nmi. This test passes as long as there is not a climb or an increase climb advisory.
4.9.2.5.8. Scenario 4a: Low Altitude Allow Increase Descent. Scenario 4a shows that a descend and increase descent advi-
sories will be given at low altitudes above a certain radio altimeter threshold.
a. Set airplane under test (UUT) simulated altitude to 1390 ft and set t he radio altimeter to 1700 ft agl.
b. Set the following values as necessary.
• TCAS Type: TCAS II
• Intruder Type: Mode S
• Range at Start: 15.00 n mi
• Range Rate: +720 kts
• Altitude at St art: 1600 ft (if entering as an absolute altitude ) or +210 ft (if entering relativ e altitude)
• Altitude Rate: 0.
c. Start the scenario.
d. At a range of 5 nmi set the altitude rate to -500 fpm. This altitude rate change must occur as close to 5 nmi as possible. The
timing of the alert is tight. Changing the value too soon or too late may cause other alerts to be annunciated .
e. Monitor the TCAS display and audio system for correct presentation as follows (NOTE 1):
4-27