Gulfstream vi pilot reported discrepancies in clearances received via cpdlc.

Attributes
ACN	1566600
Time
Date	201808
Local Time Of Day	0601-1200
Place
Locale Reference	LAS.Airport
State Reference	NV
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Gulfstream G650
Operating Under FAR Part	Part 91
Flight Phase	Parked
Route In Use	SID STAAV8.DVC
Flight Plan	IFR
Component
Aircraft Component	Data Transmission and Automatic Calling
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 10000 Flight Crew Type 1400
Events
Anomaly	ATC Issue All Types Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

No incident or deviation; but I believe this needs to be noted. FMC [flight management computer] issues regarding cpdlc [controller-pilot data link communications] ATC clearances.on our gvi when receiving our clearance via cpdlc; kusa login on at las; the FMS mcdu [multipurpose control display unit] had some vital information missing - when we selected print; that information showed on the printed copy; but it was missing other text that showed on the FMS [flight management system]. It took reading both the printed copy and reading the FMC to gleam out our clearance as some information was on the FMS but not the printed copy and vice versa some information was on the printed copy but not the FMS. Of course; we called ATC to confirm our clearance.this has happened once before - departing lax our kusa cpdlc clearance instructed us to climb via the SID but being familiar with the airport we knew there would be an 'except maintain 5;000 feet' at the end of the climb via; however; the FMS showed nothing - the 'except maintain 5;000 feet' didn't show on our FMS but it did show on the printed copy when printed. We cleared it up with clearance delivery confirmed that it showed on their end as 'except maintain 5;000 feet.'this has happened on both the gvi aircraft that I fly.

Original NASA ASRS Text

Title: Gulfstream VI pilot reported discrepancies in clearances received via CPDLC.

Narrative: No incident or deviation; but I believe this needs to be noted. FMC [Flight Management Computer] issues regarding CPDLC [Controller-Pilot Data Link Communications] ATC clearances.On our GVI when receiving our clearance via CPDLC; KUSA Login on at LAS; the FMS MCDU [Multipurpose Control Display Unit] had some vital information missing - when we selected print; that information showed on the printed copy; but it was missing other text that showed on the FMS [Flight Management System]. It took reading both the printed copy and reading the FMC to gleam out our clearance as some information was on the FMS but not the printed copy and vice versa some information was on the printed copy but not the FMS. Of course; we called ATC to confirm our clearance.This has happened once before - Departing LAX our KUSA CPDLC clearance instructed us to climb via the SID but being familiar with the airport we knew there would be an 'except maintain 5;000 feet' at the end of the climb via; however; the FMS showed nothing - the 'Except maintain 5;000 feet' didn't show on our FMS but it did show on the printed copy when printed. We cleared it up with clearance delivery confirmed that it showed on their end as 'Except maintain 5;000 feet.'This has happened on both the GVI aircraft that I fly.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.