User's Guide

User Guide for the Envoy Data Link
Document Number: UG-15000 Rev. A Page 22 of 173
REPORT SENT
ROUTE NOT LOADABLE
SENDING SATCOM LINK TEST
Maintenance test function
SENDING VHF LINK TEST
Maintenance test function
TEST NOT AVAILABLE
A necessary peripheral device for conducting the test is unavailable.
2.2.8 Data Formatting and Data Validation
The Envoy autopopulates fields with autopopulated data from connected cockpit devices. Pages
that construct downlink messages use intuitive formatting and validation for input data, such as:
• For CPDLC messages, an airport identifier is 4 characters (ICAO format)
• An endpoint action does not display until required data has been provided
• An input field or endpoint action does not display if the aircraft is not in the expected/required OOOI
state
The Envoy intuitively formats units for input values as part of message composition. For CPDLC
message construction, multiple elements can be combined in a downlink message and the
constructed message is presented for the aircrew to verify prior to sending.
For examples, see Section 3.4 Typical Message Composition.
The preference for metric or English units is a configuration item, but it can be overridden by
explicitly specifying a unit identifier, for example:
FOB
(*100)
Fuel on board is either LB or KG, depending on configuration options and A429 data feeds. If an
explicit unit indicator (LB or KG) is input, the Envoy handles the transition to the configured unit,
as necessary.
Note: For certain pages, such as FANS POS Report or Emergency ADS, remaining fuel is
represented by time HH:MM, obtained from bus feed.
SPEED
• N single numeric character between 6 and 9, inclusive, is formatted as .61M to .90M (Mach).
• NN 2 numeric characters between 61 and 92, inclusive, is formatted as .61M to .92M (Mach).
• NNN 3 numeric characters between 070 and 380, inclusive, in increments of 10 with no
decimal (.) is formatted as KTS.
• [0].NN an optional 0 numeric followed by a decimal point and 1 or 2 numeric characters in
ranges 6 to 9 or 61 to 92, is formatted as .61M to .92M.
Examples:
• 7, .7, and 70 are automatically interpreted as 0.70M (Mach).
• 3 numeric characters with no decimal is automatically interpreted as KTS; i.e., 300 is 300
KTS.
CPDLC input fields accept all ICAO approved formats, for example:
Flight
Level/Altitude
A 3 digit value is interpreted as Flight Level: 350=FL350=35000FT or 20000FT=FL200
A 4 digit value is interpreted as FT by default: 3000 (4 digits) =3000FT, unless
Entering M after a numeric is interpreted as meters: 900M 2499M.
Note: A429 data feed ALT is read as pressure altitude.
Speed
5, .5, and 50 are automatically adjusted to 0.50M (Mach)
3 digits with no decimal (.) is automatically interpreted as KTS; i.e., 300=300 KTS
Facility ID
Facility ID or Airport ID is the four-character ICAO code. See Appendix F, ATSU Call Sign.
Offset distance
NM or KM, depending on configuration setting. If a specific unit identifier is included, the
Envoy automatically converts an input to the required/configured unit.