. Determine latest time speed change clearance can be issued to maintain required separation

. Formulate clearance for trailing aircraft to reduce speed to speed of leading aircraft

– If necessary, check desired speed with trailing aircraft [“American 123.  Boston Center.  Can you reduce speed to mach 0.74?”]

– Wait for response and note ability to comply [“Boston Center.  American 123.  Affirmative.”]

. Issue clearance [“American 123.  Boston Center. Reduce speed to mach 0.74 for spacing.”]

. Initiate Wait for Acknowledgment task

Resolve Crossing Conflict
Causal Event:
. Crossing conflict identified

Controller Actions:
. Determine groundspeeds and distances of both aircraft from crossing waypoint

. Determine second aircraft to reach the crossing waypoint (subject aircraft)

. Determine mach number of subject aircraft

– Query aircraft for mach number [“American 123.  Boston Center.  Say mach number.”]

– Wait for response and note response contents [“Boston Center.  American 123 is at mach 0.80.”]

. Formulate clearance for subject aircraft to reduce speed to resolve the conflict

– If necessary, check desired speed with aircraft [“American 123.  Boston Center.  Can you reduce speed to mach 0.74?”]

– Wait for response and note response contents [“Boston Center.  American 123.  Affirmative.”]

. Issue clearance [“American 123.  Boston Center. Reduce speed to mach 0.74 for traffic.”]

. Initiate Wait for Acknowledgment task

Clear Air Turbulence Module
The relationship between the tasks involved in responding to clear air turbulence is shown in Figure D-4 and described in more detail below.
Figure D-4  Clear Air Turbulence Management Tasks

Receive PIREP
Causal Event:
. Pilot transmits CAT report [“Boston Center.  American 123 is getting moderate chop at flight level 390.”]

Controller Actions:
. Update reported CAT database

Respond to Ride Information Request
Causal Event:
. Pilot requests information about ride reports at a specific altitude  [Boston Center.  American 123.  How is the ride at flight level 350?”]

Controller Actions:
. Compare subject aircraft position and pilot query to reported CAT database

. If no relevant ride reports are available then determine if it is possible to query other aircraft

– If other aircraft are in the area, query other aircraft [“Delta 46.  Boston Center.  How is your ride?”]

– Wait for response and note information [“Boston Center.  Delta 46 has been getting moderate turbulence for the last 10 miles.”]

– Update CAT database as appropriate

. Send relevant information to subject aircraft  [“American 123.  Boston Center.  Several reports of moderate chop at flight level 350 for the next 30 miles.”]

Check for Better Ride
Causal Event:
. Pilot asks the controller to identify altitudes with a better ride [Boston Center.  American 123.  Can you find us some smoother air?”]

Controller Actions:
. Compare subject aircraft position to reported CAT database

. Send relevant information to subject aircraft  [“American 123.  Boston Center.  Smooth air reported at FL 350”]

Evaluate Requested Maneuver
Causal Event:
. Pilot request for vertical maneuver to avoid CAT [“Boston Center.  American 123.  Request climb to FL350 for smooth air.”]

Controller Actions:
. Perform Sector Scan task to update aircraft positions and speeds
　
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