Airplane Flight Manual
Page 16
Sub-section - 4.10
NORMAL PROCEDURES
FAA Approved
Revision A3:
Apr 26, 2007
TCAS CHECKS
(continued)
5. Resolution Advisories (RA) are inhibited below 1100 ft AGL in a climb and 900 ft AGL in a
descent, (a TA ONLY message will be presented under these conditions). Increased climb
RAs are inhibited with FLAPS DN.
6. The pilot should not initiate evasive maneuvers using information from the traffic display only
or on a Traffic Advisory (TA) only without visually sighting the traffic. These displays and
advisories are intended only for assistance in visually locating the traffic and lack the flight
path trend necessary for use in evasive maneuvering.
However, while climbing or descending, modest changes in vertical speed based on traffic
display information are not considered evasive maneuvering.
7. Compliance with a TCAS Resolution Advisory is accomplished by changing vertical speed
(thrust/airplane configuration) as required to comply with guidance presented by the PFD
vertical speed indicator.
The TCAS II RA algorithms are based on the pilot initiating the initial 0.25g incremental
maneuver within approximately 5 seconds, and within approximately 2.5 seconds if an
individual corrective RA increase or reverse is issued. The reversal is based on a 0.5g
incremental maneuver.
8. Compliance with a TCAS RA is necessary unless the pilot considers it is unsafe to do so, or
unless the pilot has better information about the cause of the RA and can maintain safe
separation (visual acquisition of and safe separation from a nearby aircraft, obvious TCAS II
system failure, etc.)
WARNING: NONCOMPLIANCE WITH A CROSSING RA BY ONE AIRPLANE MAY RESULT
IN REDUCED VERTICAL SEPARATION; THEREFORE SAFE HORIZONTAL
SEPARATION MUST ALSO BE ASSURED BY VISUAL MEANS.
ONCE A NONCROSSING RA HAS BEEN ISSUED, SAFE OPERATION COULD
BE COMPROMISED IF CURRENT VERTICAL SPEED IS CHANGED, EXCEPT
AS NECESSARY TO COMPLY WITH THE RA.
THIS IS BECAUSE TCAS TO TCAS COORDINATION MAY BE IN PROGRESS
WITH THE INTRUDER AIRPLANE, AND ANY CHANGE IN VERTICAL SPEED
THAT DOES NOT COMPLY WITH THE RA MAY NEGATE THE EFFECTIVENESS
OF THE OTHER AIRCRAFT’S COMPLIANCE WITH ITS RA.
NOTE: The consequence of not following an RA may result in additional RAs in which aural
alert and visual annunciations may not agree with each other.
Continued Next Page
For Training Purposes Only