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HF DATA LINK (HFDL)
A High Frequency Data Link (HFDL) radio has been installed on some aircraft.
The HFDL will provide these aircraft with additional data link capabilities
outside the range of the VHF radios. On these aircraft, there will be an
additional switch behind the No. 3 Radio Tuning Panel (RTP). This switch is
labeled, GROUND TRANSMIT INHIBIT OVERRIDE.
HFDL OPERATIONS
HFDL is enabled when one or both HF radios are in the DATA mode. The HF
data radio is in the DATA mode when DATA is displayed in the RTP Active
Frequency window. No further crew action is required; the ACARS will
automatically select when to use HFDL.
GROUND TRANSMIT INHIBIT OVERRIDE
HFDL transmissions are inhibited during ground operations even if the RTP
displays DATA in the ACTIVE Frequency Window. The aircraft weight-onwheels
(air / ground switch) inhibits HFDL transmissions during ground
operations to ensure the safety of ground personnel and the aircraft. There is an
additional switch behind the No. 3 RTP labeled, GROUND TRANSMIT INHIBIT
OVERRIDE. Placing this switch in the OVERRIDE position will enable HFDL on the
ground. In normal operations HFDL is used when airborne. All HF operations
are inhibited when the fueling panel door is open.
COMMUNICATIONS
Sec. 6.5 Page 36 737
Rev. 11/15/02 #41 Continental Flight Manual
SELECTIVE CALLING (SELCAL)
A ground station desiring communications with the flight deck can use the
SELCAL system. SELCAL monitors selected frequencies on VHF and HF
radios. Each aircraft is assigned a unique four-letter SELCAL code.
>>@ When the system receives an incoming call from a ground station, a
two-tone chime sounds through the ACARS system.
BCD When the system receives an incoming call from a ground station,
a two-tone chime sounds and the respective SELCAL light illuminates.
BCD SELCAL Panel
< SELCAL Light
Illuminated (white) – Alerts crew to incoming communication on indicated
radio.
Push – Extinguishes and resets SELCAL light.
COMMUNICATIONS
737 Sec. 6.5 Page 37
Flight Manual Continental Rev. 11/15/02 #41
> ACARS
General
The ARINC communications addressing and reporting system (ACARS) is an
addressable, digital, data-link system which permits communication between the
aircraft and a ground station. The aircraft installed units of the system provide a
means of automatically reporting routine flight information to the ground station,
such as the “out / off / on / in” times, as well as pertinent engine and aircraft
performance values.
In addition to automatic transmission of data, the system provides for manual
routing of messages to and from the aircraft and the ground station, and also
provides the capability of opening a channel for voice communications.
The airborne subsystem consists of a control unit (CU) and a management unit
(MU). These units are the heart of the subsystem and operate in conjunction
with VHF No. 3 to process messages to and from the aircraft.
When a message is sent to the aircraft, a call chime sounds on the flight deck.
The chime will not stop until the crew selects VOX mode.
Automatic Functions
The MU receives ground-to-air messages from VHF No. 3, controls the
transmission of air-to-ground messages through the same transceiver, and
performs the following functions:
· Monitors the aircraft “out,” “off,” “on,” and “in” event sensors. Stores the
GMT time as each event occurs, and automatically outputs this data to VHF
No. 3 for transmission to the ground station.
· Accepts messages and commands from the ground station, which are
addressed to the particular aircraft which the unit is installed.
· Accepts messages and commands from the CU for air-to-ground
transmission.
· Controls the ACARS mode of operation.
· Controls the sequential transmission of priority messages.
· Performs error check or messages sent, and alerts the crew if the message is
received incorrectly by the ground station.
COMMUNICATIONS
Sec. 6.5 Page 38 737
Rev. 11/15/02 #41 Continental Flight Manual
The “out / off / on / in” reports are generated for automatic transmission by the
following sensors:
Out - Parking brake released, all entry / service / cargo doors closed,
either engine normal oil pressure.
Off - Landing gear strut extension.
On - Landing gear strut compression.
In - Parking brake set, any entry / service / cargo door open, both
engines low oil pressure.
The time of each event is recorded from the GMT clock and the report is
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