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3.1.2.6.10.3.1 Aircraft with an automatic means for determining the on-the-ground condition that are equipped to
format extended squitter messages shall pcrfom the following validation check:
If the automatically determined airlground status is not available or is "airborne", no validation shall be performed. If
the automatically determined airfground status is available and "on-the-ground" condition is being reported, the
aidground status shall be ovemdden and changed to "airborne" if the conditions given for the vehicle category in
Table 3-6 are satisfied.
Note.- While this test is only required for aircraft that are equipped to format extended squitter messages, this feature
is desirable for all aircraft.
3.1.2.6.11 STANDARLDEN GTH COMMUNICATIONS PROTOCOLS
Note I.- The two types of standard length communications protocols are Cornm-A and Comm-B; messages using these
protocols are transferred under the control of the interrogatol: Comm-A messages are sent directly to the transponder and
are completed within one transaction. A Comm-B message is used to transfer information from air to ground and can be
initiated either by the interrogator or the trunsponder. In the case of ground-initiated Comm-B transfers, the interrogator
requests data to be reud out from the transpondel; which delivers the message in the same transaction. In the case of airinitiated
Comm-B tmnsfers, the transponder unnounces the intention to transmit a message; in a subsequent transaction
an interrogator will extract the message.
Note 2.- In a non-selective air-initiated Comm-B protocol all transactions necessary can be controlled by uny
interrogator:
Note 3.- In sorne areas of overlapping interrogator coverage there may be no means for coordinating interrogator
activities via ground communications. Air-initiated Comm-B communications protocols require more than one
Chapter 3 Annex 10 - Aeronautical Telecommunications
Table 3-6. Validation of on-the-ground status
transaction for completion. Provision is mude to ensure that a Comm-B messuge is closed out only by the interrogator
that actuul[y transfcrrcd the mcssuge. This can be uccomplishcd through thc use of the rnultisitc Comm-B
communications protocols or through the use of the enhanced Comm-B communicutions protocols.
Determination of uirborne status
Note 4.- The multisite and the non-selective communications protocols cannot be used simultaneo~isly in a region of
overlapping interrogator coverage unless the in~errogutors coordinate their communications activities via ground
comnzunicutions.
Note 5.- The multisite communications protocol is independent of the multisite lockout protocol. That is, the multisite
comrnun~icationsp rotocol may be used with the non-selective lockout protocol und vice versa. The choice of lockour uiad
comrnunicuttons protocols to be used depends upon the network management technique being used.
Radio
Altitude
Nule 6.- The bruadcast Cumm-B prolucul can be wed to muke u message uvailuble to ull active interrogators.
AN category Airspeed
3.1.2.6.11.1 Cornrn-A. The interrogator shall deliver a Comm-A message in the MA field of an interrogation UF =
20 or 21.
Ground
Speed
No information
Weight < 15 500 Ibs (7 031 kg)
Weight 215 500 Ibs (7 031 kg)
High performance (>5 g acceleration and xi00 knots)
- - - - - .
Rotorcraft
3.1.2.6.11.1.1 Comm-A technical acknowledgement. Acceptance of a Comm-A interrogation shall be automatically
technically acknowledged by the transponder, by the transmission of the requested reply (3.1.2.10.5.2.2.1).
Note.- The receipt of a reply from the transponder according to the rules of 3.1.2.4.1.2.3 d) and 3-1.2.4.1.3.2.2.2 is
the acknowledgement to the interrogator that the message has been received and stored by the trunspondel: If either uplink
or downlink fuil, this reply will be missing and the interrogator will normally send the message again. In the case of
downlink failure the transponder may receive the message more than once.
No change to on-[he-ground status
-
No change to on-the-ground status
3.1.2.6.1 1.1.2 Comm-A broadcast. I f a Comm-A broadcast interrogation is accepted (3.1.2.4.1.2.3.1.3) information
transfer shall be handled according to 3.1.2.10.5.2.1.1 but other transponder functions shall not be affected and a reply
shall not be transmitted.
Note I.- There is no t~chnicula cknowledgement to u Comm-A broadcust message
-
>50 feet
-
>50 feet
--
Note 2.- Since the transponder does not process the control fields of a Comm-A broudcast interrogation, the 27 hits
follorving the VFFeld are also available for user data.
No change to on-the-ground status
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