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AIM 

6/17/21 

TBL 5

3

16 

Free Text Uplink Message Elements (TXTU) 

CPDLC Message Sets 

Operational Definition in PANS

ATM (Doc 4444) 

FANS 1/A 

ATN B1 

Response 

Message 
Element 

Identifier 

Message Element 

Intended Use 

Format for 

Message Ele-

ment Display 

UM169 (

free text

UM203 (

free text

TXTU

(

free text

Note

M alert 

attribute. 

UM169 (

free text

N/A 

See Note 

(

free text

CPDLC NOT IN USE 
UNTIL FURTHER 
NOTIFICATION 

UM169 (

free text

N/A 

See Note 

(

free text

“[facility designation]” 
LOCAL ALTIMETER 
(for Altimeter Report-
ing Station) 

UM169 (

free text

N/A 

See Note 

(

free text

“[facility designation] 
LOCAL ALTIMETER 
MORE THAN ONE 
HOUR” OLD 

UM169 (

free text

DUE TO WEATHER 

N/A 

See Note 

(

free text

UM169 (

free text

REST OF ROUTE UN-
CHANGED 

N/A 

See Note 

(

free text

UM169 (

free text

N/A 

See Note 

(

free text

TRAFFIC FLOW 
MANAGEMENT 
REROUTE 

NOTE

 

These are FAA scripted free text messages with no GOLD equivalent. 

En Route Procedures 

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