CY 14 16 18 20 22 24 26 28 30

Segment 1 Phase 1Tower Services

Initial En Route Services

Departure Clearances (DCL)

Transfer of CommunicationsInitial Check-InAltimeter SettingsAltitudesAirborne Reroutes Controller Initiated Routes (Limited)Direct-to-Fix (Limited)Crossing Restrictions (Limited)

Data Comm Services Strategy

Data Comm RoutineCommunications

Segment 2Advanced Services

4D Trajectories, Dynamic RNP, Adv Flt Int Mgt w/ATC winds,D-TAXI

IOC

IOC

IOC

Full En Route Services

Tailored Arrivals (Limited)Holding Instructions (Limited)Advisory Messages (Limited)Speed and Headings Beacon Codes (Limited)Stuck MicrophoneController Initiated Routes (Full)Direct-to-Fix (Full)Crossing Restrictions (Full)

Segment 1 Phase 2 En Route Services

1. Transfer of Communications Service

• Initial S1P2 Includes ICAO facility ID and specified frequency

• Full S1P2 Adds constraints of time and position to the Contact and

Monitor messages

2

Full S1P2 Uplinks Full S1P2 Downlinks

UM118 AT [position] CONTACT [icaounitname] [frequency]

UM119 AT [time] CONTACT [icaounitname] [frequency]

UM121 AT [position] MONITOR [icaounitname] [frequency]

UM122 AT [time] MONITOR [icaounitname] [frequency]

Initial S1P2 Uplinks Initial S1P2 Downlinks

UM117 CONTACT [icaounitname] [frequency]

DM0 WILCO

UM120 MONITOR [icaounitname] [frequency]

DM1 UNABLE

DM2 STANDBY

DM20 REQUEST VOICE CONTACT

2. Initial Check-In Service

• Initial S1P2 Constrained to single altitude value altitude assignments

• Full S1P2 Adds downlink altitude assignments that can be a block

altitude

3

Full S1P2 Uplinks Full S1P2 Downlinks

DM77 ASSIGNED BLOCK [altitude] TO [altitude] - where Altitude can be a block altitude

Initial S1P2 Uplinks Initial S1P2 Downlinks

UM135 CONFIRM ASSIGNED ALTITUDE

DM38 ASSIGNED ALTITUDE [altitude]

3. Airborne Reroutes Service• Initial S1P2

Includes a route clearance defined by position or named procedure and clarifying text

• Full S1P2 Expands route clearance to include a named

procedure at a position

4

Full S1P2 Uplinks Full S1P2 Downlinks

UM84 AT [position] CLEARED [procedurename]

Initial S1P2 Uplinks Initial S1P2 Downlinks

UM79 CLEARED TO [position] VIA [routeclearance]

DM0 WILCO

UM80 CLEARED [routeclearance] DM1 UNABLE

UM83 AT [position] CLEARED [routeclearance]

DM2 STANDBY

UM169 [free text] DM3 ROGER

UM81 CLEARED [procedurename] DM65 DUE TO WEATHER

DM66 DUE TO AIRCRAFT PERFORMANCE

4. Altimeter Service

• Initial S1P2 The service is completely implemented in Initial

S1P2

5

Initial S1P2 Uplinks Initial S1P2 Downlinks

UM153 ALTIMETER [altimeter] DM3 ROGER

UM169 [free text]

5. Altitudes Services

• Initial S1P2 Limited single value altitude messages (e.g., climb,

maintain, descend) • Full S1P2

Adds uplinks related to immediate stops, reporting of altitudes; expands uplink parameters (e.g. block altitudes, descent rates); and adds altitude related pilot requests

5. Altitudes Services

7

Initial S1P2 UplinksUM19 MAINTAIN [altitude]

UM38 IMMEDIATELY CLIMB TO [altitude]

UM20 CLIMB TO AND MAINTAIN [altitude]

UM39 IMMEDIATELY DESCEND TO [altitude]

UM23 DESCEND TO AND MAINTAIN [altitude]

UM166 DUE TO TRAFFIC

UM36 EXPEDITE CLIMB TO [altitude]

UM167 DUE to AIRSPACE RESTRICTION

UM37 EXPEDITE DESCENT TO [altitude]

UM169 [free text]

UM177 AT PILOTS DISCRETION

Full S1P2 UplinksUM26 CLIMB TO REACH [altitude] BY [time]

UM41 IMMEDIATELY STOP DESCENT AT [altitude]

UM27 CLIMB TO REACH [altitude] BY [position]

UM128 REPORT LEAVING [altitude]

UM28 DESCEND TO REACH [altitude] BY [time]

UM129 REPORT LEVEL [altitude]

UM29 DESCEND TO REACH [altitude] BY [position]

UM133 CONFIRM ALTITUDE

UM30 MAINTAIN BLOCK [altitude] TO [altitude]

UM173 DESCEND AT [vertical rate] MINIMUM

UM31 CLIMB TO AND MAINTAIN BLOCK [altitude] TO [altitude]

UM174 DESCEND AT [vertical rate] MAXIMUM

UM32 DESCEND TO AND MAINTAIN BLOCK [altitude] TO [altitude]

UM175 REPORT REACHING [altitude]

UM33 CRUISE [altitude] UM180 REPORT REACHING BLOCK [altitude] TO [altitude]

UM40 IMMEDIATELY STOP CLIMB AT [altitude]

Initial S1P2 DownlinksDM0 WILCO DM65 DUE TO WEATHER

DM1 UNABLE DM66 DUE TO AIRCRAFT PERFORMANCE

DM2 STANDBY

Full S1P2 Downlinks

DM6 REQUEST [altitude]

DM7 REQUEST BLOCK [altitude] TO [altitude]

DM9 REQUEST CLIMB TO [altitude]

DM10 REQUEST DESCENT TO [altitude]

DM32 PRESENT ALTITUDE [altitude]

DM37 LEVEL [altitude]

DM76 REACHING BLOCK [altitude] TO [altitude]

DM77 ASSIGNED BLOCK [altitude] TO [altitude]

6. Controller Initiated Routes Service

• Initial S1P2 Includes uplinks including proceed direct to position, route

clearance, or procedure, and related cause (traffic, airspace restriction)

Entry via keyboard entry from the R and RA positions Entry via route menu from RA position

• Full S1P2 Adds uplinks including proceed back on route, rejoin route

by time/position, holding at position, report back on route Adds downlinks for pilot to request procedure name,

request route clearance, and report back on route Entry via Trackball entry from the R and RA positions

• RA entry is via the Graphic Plan Display Entry via Route menu from R position

8

6. Controller Initiated Routes Service

Initial S1P2 Uplinks Initial S1P2 Downlinks

UM74 PROCEED DIRECT TO [position]

DM0 WILCO

UM79 CLEARED TO [position] VIA [routeclearance]

DM1 UNABLE

UM80 CLEARED [routeclearance] DM2 STANDBY

UM81 CLEARED [procedurename] DM22 REQUEST DIRECT TO [position]

UM83 AT [position] CLEARED [routeclearance]

DM40 ASSIGNED ROUTE [routeclearance]

UM137 CONFIRM ASSIGNED ROUTE

DM65 DUE TO WEATHER

UM166 DUE TO TRAFFIC DM66 DUE TO AIRCRAFT PERFORMANCE

UM167 DUE TO AIRSPACE RESTRICTION

UM169 [free text]

9

Full S1P2 Uplinks

UM67 PROCEED BACK ON ROUTE

UM68 REJOIN ROUTE BY [position]

UM69 REJOIN ROUTE BY [time]

UM71 EXPECT BACK ON ROUTE BY [time]

UM72 RESUME OWN NAVIGATION

UM75 WHEN ABLE PROCEED DIRECT TO [position]

UM76 AT [time] PROCEED DIRECT TO [position]

UM82 CLEARED TO DEVIATE UP TO [distanceoffset][direction] OF ROUTE

UM84 AT [position] CLEARED [procedurename]

UM127 REPORT BACK ON ROUTE

Full S1P2 Downlinks

DM23 REQUEST [procedure name]

DM24 REQUEST [routeclearance]

DM25 REQUEST CLEARANCE

DM41 BACK ON ROUTE

7. Direct to Fix Service

• Initial S1P2 Includes clearance to proceed direct to a specified position

and downlink request to proceed direct Direct-to-fix entry from keyboard

• Full S1P2 Adds uplinks including at position/altitude proceed direct to

a position Entry via trackball entry/data block (R position) or route

menu (R and RA positions)

10

Initial S1P2 Uplinks Initial S1P2 Downlinks

UM74 PROCEED DIRECT TO [position]

DM0 WILCO

UM0 UNABLE (note - response to DM22 as per GOLD)

DM1 UNABLE

DM2 STANDBY

DM22 REQUEST DIRECT TO [position]

Full S1P2 Uplinks Full S1P2 Downlinks

UM77 AT [position] PROCEED DIRECT TO [position]

UM78 AT [altitude] PROCEED DIRECT TO [position]

UM96 FLY PRESENT HEADINGS (note - response to DM22 as per GOLD)

8. Holding Instructions Service

• Initial S1P2 Holding Instructions service is NOT provided

• Full S1P2 (Limited) Adds uplink to hold at a position Leverages other messages contained in other

services (e.g., controller initiated routes)

11

Full S1P2 Uplinks Full S1P2 DownlinksUM92 HOLD AT [position] AS PUBLISHED MAINTAIN [altitude]

UM93 EXPECT FURTHER CLEARANCE AT [time]

9. Crossing Restrictions Service• Initial S1P2

Limited crossing restrictions at a specific fix, at a specific altitude with or without a specific speed

Entry of named fixes via the keyboard at the R- and RA positions A menu based capability is needed for the entry of crossing

restrictions. These would be preset restrictions, defined in adaptation

• Full S1P2 Adds ability to instruct an aircraft to cross a specific fix at a specific

time FLM will be able to define these preset restrictions Controller will be able to enter a crossing a point that is a point in

space (lat/long) rather than a named fix R-Position will have the option of entering crossing restrictions via

the trackball or data block interaction.

12

9. Crossing Restrictions Service

Initial S1P2 Uplinks Initial S1P2 Downlinks

UM49 CROSS [position] AT AND MAINTAIN [altitude]

DM0 WILCO

UM61 CROSS [position] AT AND MAINTAIN [altitude] AT [speed]

DM1 UNABLE

DM2 STANDBY

Full S1P2 Uplinks Full S1P2 Downlink

UM46 CROSS [position] AT [altitude]

UM47 CROSS [position] AT OR ABOVE [altitude]

UM48 CROSS [position] AT OR BELOW [altitude]

UM50 CROSS [position] BETWEEN [altitude] AND [altitude]

UM51 CROSS [position] AT [time]

UM55 CROSS [position] AT [speed]

UM56 CROSS [position] AT OR LESS THAN [speed]

UM57 CROSS [position] AT OR GREATER THAN [speed]

UM62 AT [time] CROSS [position] AT AND MAINTAIN [altitude]

UM63 AT [time] CROSS [position] AT AND MAINTAIN [altitude] AT [speed]

13

10. Tailored Arrival Service

• Initial S1P2 Tailored arrival service is NOT provided

• Full S1P2 (Limited) Controller ability to enable an efficient descent with a clearance for

specified routing and descent profile

.

14

Full S1P2 Uplinks Full S1P2 Downlinks

UM19 MAINTAIN [altitude]

UM79 CLEARED TO [position] VIA [routeclearance]

UM80 CLEARED [routeclearance]

UM81 CLEARED [procedurename]

UM83 AT [position] CLEARED [routeclearance]

UM84 AT [position] CLEARED [procedurename]

UM169 [free text]

11. Advisory Services

• Initial S1P2 Advisory service is NOT provided

• Full S1P2 (Limited) Used to convey information to a pilot but controller is not

expecting a response Leverages S1P2 UM169 [free text] message for sending

advisory messages

15

Full S1P2 Uplinks Full S1P2 Downlinks

UM169 [free text]

12. Speeds Service

• Initial S1P2 Speeds service is NOT provided

• Full S1P2 (Limited) Enables controller to request to maintain, increase,

reduce or confirm speed Allows pilot initiated downlink for speed

16

Full S1P2 Uplinks

UM106 MAINTAIN [speed] UM113 REDUCE SPEED TO [speed]

UM107 MAINTAIN PRESENT SPEED UM114 REDUCE SPEED TO [speed] OR LESS

UM108 MAINTAIN [speed] OR GREATER UM115 DO NOT EXCEED [speed]

UM109 MAINTAIN [speed] OR LESS UM116 RESUME NORMAL SPEED

UM111 INCREASE SPEED TO [speed] UM134 CONFIRM SPEED

UM112 INCREASE SPEED TO [speed] OR GREATER UM136 CONFIRM ASSIGNED SPEED

Full S1P2 Downlinks

DM18 REQUEST [speed]

DM34 PRESENT SPEED [speed]

DM39 ASSIGNED SPEED [speed]

13. Headings Service

• Initial S1P2 Headings service NOT provided

• Full S1P2 (Full) Enable controller to create and uplink a heading to an

aircraft; will automatically update 4th line of data block

17

Full S1P2 Uplinks Full S1P2 Downlinks

UM68 REJOIN ROUTE BY [position] DM26 REQUEST WEATHER DEVIATION TO [position] VIA [routeclearance]

UM94 TURN [direction] HEADING [degrees] DM27 REQUEST WEATHER DEVIATION UP TO [distanceoffset] [direction] OF ROUTE

UM96 FLY PRESENT HEADING DM35 PRESENT HEADING [degrees]

UM97 AT [position] FLY HEADING [degrees] DM70 REQUEST HEADING [degrees]

UM98 IMMEDIATELY TURN [direction] HEADING [degrees]

UM145 CONFIRM HEADING

UM0 UNABLE (Note - Allowed response to DM26-27 as per GOLD)

14. Beacon Codes Service

• Initial S1P2 Beacon Codes service is NOT provided

• Full S1P2 (Limited) Automation will populate the assigned beacon code in

the UM123 for controller uplink Beacon Code is editable in the event the controller

needs to change it.

18

Full S1P2 Uplinks Full S1P2 Downlinks

UM123 SQUAWK [beaconcode] DM47 SQUAWKING [beaconcode]

UM179 SQUAWK IDENT

15. Stuck Microphone Service

• Initial S1P2 Stuck Microphone service is NOT provided

• Full S1P2 (Limited) Provide the ability to uplink a message instructing pilots

of Data Comm equipped aircraft to check their microphone

19

Full S1P2 Uplinks Full S1P2 Downlinks

UM169 [free text]

16. Other Messages

A. Generic Service Messages

B. System/Error Messages

C. Emergency Messages

20

16 A. Generic Service Messages

Full S1P2 Uplinks Full S1P2 Downlinks

UM165 THEN

21

Initial S1P2 Uplinks

Initial S1P2 Downlinks

UM0 UNABLE DM65 DUE TO WEATHER

UM1 STANDBY DM66 DUE TO AIRCRAFT PERFORMANCE

UM3 ROGER

UM4 AFFIRM

UM5 NEGATIVE

• Initial S1P2 General controller response messages Allows pilot clarification of response due to weather or

aircraft performance• Full S1P2

Adds controller ability to uplink “THEN”

16 B. System/Error Messages

• Initial S1P2 Provides all necessary messages

• Full S1P2 No changes

22

Initial S1P2 Uplinks Initial S1P2 Downlinks

Um159 ERROR [errorinformation] DM62 ERROR [errorinformation]

UM160 NEXT DATA AUTHORITY [icaofacilitydesignation]

DM63 NOT CURRENT DATA AUTHORITY

UM161 END SERVICE DM64 [icaofacilitydesignation]

UM162 SERVICE UNAVAILABLE DM65 DUE TO WEATHER

UM163 system message ([icaofacilitydesignation] [tp4Table])

DM66 DUE TO AIRCRAFT PERFORMANCE

UM178 [trackdetailmsg-deleted] DM67 [free text]

DM68 [free text]

16 C. Emergency Messages • Initial S1P2

Provides all necessary messages*

• Full S1P2 No changes

23

Initial S1P2 Uplinks Initial S1P2 DownlinksUM131 REPORT REMAINING FUEL AND PERSONS ON BOARD DM47 SQUAWKING [beaconcode] (if beaconcode is emergency code 7500,

7600, or 7700, then emergency session is created)

DM55 PAN PAN PAN

DM56 MAYDAY MAYDAY MAYDAY

DM57 [remainingfuel] OF FUEL REMAINING AND [remainingsouls] SOULS ON BOARD

DM58 CANCEL EMERGENCY

DM59 DIVERTING TO [position] VIA [routeclearance]

DM60 OFFSETTING [distanceoffset] [direction] OF ROUTE

DM61 DESCENDING TO [altitude]

DM80 DEVIATING UP TO [distancepoffset] [direction] OF ROUTE

* When an emergency session exists, all downlinks (including those not supported in S1) are accepted and message content

will be displayed at a designated position(s)

| 24 |

FANS 1/A (+) messages NOT RECOMMENDED for Segment 1

Overview

• The following slides identify specific messages for a particular service that are not recommended for Segment 1*

• These messages remain candidates for service expansion in Segment 2

25

*Note: When an emergency session exists , all downlinks (including those not supported in S1) are accepted and message content will be

displayed at a designated position(s)

1. Transfer of Communications Service:Messages Not Applicable for Segment 1

Uplink Downlink

DM21 REQUEST VOICE CONTACT [frequency]

DM89 MONITORING [unit name] [frequency]

26

2. Initial Check In Service: Messages Not Applicable for Segment 1

Uplink DownlinkDM74 MAINTAIN OWN SEPARATION AND VMC

DM79 ATIS [atis code]

27

3. ABRR ServiceMessages Not Applicable for Segment 1

Uplink DownlinkUM99 EXPECT [procedure name]

28

5. Altitudes Service:Messages Not Applicable for Segment 1 (1/2)

Uplink MessagesUM6 EXPECT [altitude] UM 16 AT [position] EXPECT DESCENT TO

[altitude] UM148 WHEN CAN YOU ACCEPT [altitude]

UM7 EXPECT CLIMB AT [time] UM17 AT [time] EXPECT CRUISE CLIMB TO [altitude]

UM149 CAN YOU ACCEPT [altitude] AT [position]

UM8 EXPECT CLIMB AT [position] UM18 AT [position] EXPECT CRUISE CLIMB TO [altitude]

UM150 CAN YOU ACCEPT [altitude] AT [time]

UM9 EXPECT DESCENT AT [time] UM21 AT [time] CLIMB TO AND MAINTAIN [altitude]

UM171 CLIMB AT [vertical rate] MINIMUM

UM10 EXPECT DESCENT AT [position] UM22 AT [position] CLIMB TO AND MAINTAIN [altitude]

UM172 CLIMB AT [vertical rate] MAXIMUM

UM11 EXPECT CRUISE CLIMB AT [time] UM24 AT [time] DESCEND TO AND MAINTAIN [altitude]

UM181 REPORT DISTANCE [to/from] [position]

UM12 EXPECT CRUISE CLIMB AT [position] UM25 AT [position] DESCEND TO AND MAINTAIN [altitude]

UM13 AT [time] EXPECT CLIMB TO [altitude] UM34 CRUISE CLIMB TO [altitude]

UM14 AT [position] EXPECT CLIMB TO [altitude] UM35 CRUISE CLIMB ABOVE [altitude]

UM15 AT [time] EXPECT DESCENT TO [altitude]

29

5. Altitudes Service: Messages Not Applicable for Segment 1 (2/2)

Downlink Messages

DM8 REQUEST CRUISE CLIMB TO [altitude] DM52 WHEN CAN WE EXPECT LOWER ALTITUDE

DM11 AT [position] REQUEST CLIMB TO [altitude] DM53 WHEN CAN WE EXPECT HIGHER ALTITUDE

DM12 AT [position] REQUEST DESCENT TO [altitude] DM54 WHEN CAN WE EXPECT CRUISE CLIMB TO [altitude]

DM13 AT [time] REQUEST CLIMB TO [altitude] DM69 REQUEST VMC DESCENT

DM14 AT [time] REQUEST DESCENT TO [altitude] DM72 REACHING [altitude]

DM28 LEAVING [altitude]

DM29 CLIMBING TO [altitude]

DM30 DESCENDING TO [altitude]

30

6. Controller Initiated Routes Service:Messages Not Applicable for Segment 1

Uplink DownlinkUM70 EXPECT BACK ON ROUTE BY [position] DM31 PASSING [position]

UM85 EXPECT [routeclearance] DM33 PRESENT POSITION [position]

UM86 AT [position] EXPECT [routeclearance] DM40 ASSIGNED ROUTE [routeclearance]

UM130 REPORT PASSING [position] DM42 NEXT WAYPOINT [position]

UM132 CONFIRM POSITION DM43 NEXT WAYPOINT ETA [time]

UM137 CONFIRM ASSIGNED ROUTE DM44 ENSUING WAYPOINT [position]

UM138 CONFIRM TIME OVER REPORTED WAYPOINT DM45 REPORTED WAYPOINT [position]

UM139 CONFIRM REPORTED WAYPOINT DM46 REPORTED WAYPOINT [time]

UM140 CONFIRM NEXT WAYPOINT

UM141 CONFIRM NEXT WAYPOINT ETA DM48 POSITION REPORT [positionreport]

UM142 CONFIRM ENSUING WAYPOINT DM51 WHEN CAN WE EXPECT BACK ON ROUTE

UM146 CONFIRM GROUND TRACK

UM147 REQUEST POSITION REPORT

31

7. Direct to Fix Service:Messages Not Applicable for Segment 1

Uplink DownlinkUM87 EXPECT DIRECT TO [position]

UM88 AT [position] EXPECT DIRECT TO [position]

UM89 AT [time] EXPECT DIRECT TO [position]

UM90 AT [altitude] EXPECT DIRECT TO [position]

32

8. Holding Instructions ServiceMessages Not Applicable for Segment 1

33

Uplink DownlinkUM91 HOLD AT [position] MAINTAIN [altitude] INBOUND TRACK [degrees] [direction] TURNS [leg type]

9. Crossing Restrictions Service:Messages Not Applicable for Segment 1

Uplink DownlinkUM42 EXPECT TO CROSS [position] AT [altitude]

UM43 EXPECT TO CROSS [position] AT OR ABOVE [altitude]

UM44 EXPECT TO CROSS [position] AT OR BELOW [altitude]

UM45 EXPECT TO CROSS [position] AT AND MAINTAIN [altitude]

UM52 CROSS [position] AT OR BEFORE [time]

UM53 CROSS [position] AT OR AFTER [time]

UM54 CROSS [position] BETWEEN [time] AND [time]

UM58 CROSS [position] AT [time] AT [altitude]

UM59 CROSS [position] AT OR BEFORE [time] AT [altitude]

UM60 CROSS [position] AT OR AFTER [time] AT [altitude]

34

10. Tailored Arrivals Service:Messages Not Applicable for Segment 1

Uplink Downlink

none none

35

11. Advisory Service:Messages Not Applicable for Segment 1

Uplink DownlinkUM154 RADAR SERVICE TERMINATED

UM155 RADAR CONTACT [position]

UM156 RADAR CONTACT LOST

UM158 ATIS [atis code]

UM182 CONFIRM ATIS CODE

36

12. Speeds Service:Messages Not Applicable for Segment 1

Uplink DownlinkUM100 AT [time] EXPECT [speed] DM19 REQUEST [speed] TO [speed]

UM101 AT [position] EXPECT [speed] DM49 WHEN CAN WE EXPECT [speed]

UM102 AT [altitude] EXPECT [speed] DM50 WHEN CAN WE EXPECT [speed] TO [speed]

UM103 AT [time] EXPECT [speed] TO [speed]

UM104 AT [position] EXPECT [speed] TO [speed]

UM105 AT [altitude] EXPECT [speed] TO [speed]

UM110 MAINTAIN [speed] TO [speed]

UM151 WHEN CAN YOU ACCEPT [speed]

37

13. Headings Service:Messages Not Applicable for Segment 1

Uplink DownlinkUM64 OFFSET [distanceoffset] [direction] OF ROUTE DM15 REQUEST OFFSET [distanceoffset] [direction] OF

ROUTE

UM65 AT [position] OFFSET [distanceoffset] [direction] OF ROUTE

DM16 AT [position] REQUEST OFFSET [distanceoffset] [direction] OF ROUTE

UM66 AT [time] OFFSET [distanceoffset] [direction] OF ROUTE

DM17 AT [time] REQUEST OFFSET [distanceoffset] [direction] OF ROUTE

UM95 TURN [direction] GROUND TRACK [degrees] DM36 PRESENT GROUND TRACK [degrees]

UM152 WHEN CAN YOU ACCEPT [distanceoffset] [direction] OFFSET

DM71 REQUEST GROUND TRACK [degrees]

38

14. Beacon Codes Service:Messages Not Applicable for Segment 1

Uplink DownlinkUM124 STOP SQUAWK

UM125 SQUAWK ALTITUDE

UM126 STOP ALTITUDE SQUAWK

UM144 CONFIRM SQUAWK

39

15. Stuck Microphone Service:Messages Not Applicable for Segment 1

Uplink DownlinkUM157 CHECK STUCK MICROPHONE [frequency]

40

16. Multiple Service:Messages Not Applicable for Segment

1

Uplink Downlink

UM2 REQUEST DEFERRED DM4 AFFIRM

UM164 WHEN READY DM5 NEGATIVE

UM168 DISREGARD DM75 AT PILOTS DISCRETION

DM78 AT [time] [distance] [to/from] [position]

41