AIM 

4/20/23 

TBL 5

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3

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16 

Free Text Uplink Message Elements (TXTU) 

CPDLC Message Sets 

Operational Definition in PANS

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ATM (Doc 4444) 

FANS 1/A 

ATN B1 

Response 

Message 

Element 

Identifier 

Message Element 

Intended Use 

Format for 

Message 

Element Display 

UM169 (

free text

) 

UM203 (

free text

) 

R 

TXTU

−

1 

(

free text

) 

Note

−

M alert 

attribute. 

UM169 (

free text

) 

N/A 

R 

See Note 

(

free text

) 

CPDLC NOT IN USE 

UNTIL FURTHER 

NOTIFICATION 
UM169 (

free text

) 

N/A 

R 

See Note 

(

free text

) 

“[facility designation]” 

LOCAL ALTIMETER 

(for Altimeter 

Reporting Station) 
UM169 (

free text

) 

N/A 

R 

See Note 

(

free text

) 

“[facility designation] 

LOCAL ALTIMETER 

MORE THAN ONE 

HOUR” OLD 
UM169 (

free text

) 

DUE TO WEATHER 

N/A 

R 

See Note 

(

free text

) 

UM169 (

free text

) 

REST OF ROUTE 

UNCHANGED 

N/A 

R 

See Note 

(

free text

) 

UM169 (

free text

) 

N/A 

R 

See Note 

(

free text

) 

TRAFFIC FLOW 

MANAGEMENT 

REROUTE 

NOTE

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

En Route Procedures

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