Garmin GDL 84 User manual

Garmin International
1200 E. 151st Street Olathe, KS 66062
USA

ROTORCRAFT FLIGHT MANUAL SUPPLEMENT

for STC SR02123SE

GARMIN GDL 84H/88H ADS-B TRANSCEIVER

LOG OF REVISIONS

Revision

Number

Date

Description

1

07/29/2015

Complete Supplement

190-01310-J4 Rev. 1 Page 2 of 15
FAA APPROVED

Garmin International
1200 E. 151st Street Olathe, KS 66062
USA

ROTORCRAFT FLIGHT MANUAL SUPPLEMENT

for STC SR02123SE

GARMIN GDL 84H/88H ADS-B TRANSCEIVER

Table of Contents

SECTION PAGE

Section 1. LIMITATIONS 4

1.1 Minimum Equipment 4

1.2 ADS-B Out 4

1.3 Anonymous Mode 4

1.4 Applicable System Software 5

1.5 Pressure Altitude Broadcast Inhibit (PABI) 5

1.6 Traffic Alerting 5

1.7 Rotorcraft with No Heading Source 5

Section 2. NORMAL PROCEDURES 6

2.1 Unit Power On 6

2.2 Before Takeoff 6

2.3 VISUAL/AURAL TRAFFIC ALERT 6

Section 3. EMERGENCY / MALFUNCTION PROCEDURES 6

3.1 Emergency Procedures 6

3.2 Abnormal Procedures 6

Section 4. PERFORMANCE 7
Section 5. WEIGHT AND BALANCE 7

MANUFACTURER’S DATA
Section 1. SYSTEM DESCRIPTIONS 8

Garmin GDL 84H/88H UAT Transceiver 8
Capabilities 10
Installation Configuration 10
Definitions 12
Pilot’s Guide 13
Mode 3/A Code, IDENT, and Emergency Status 13
Flight ID 13
Transmitted Air Ground Status 13
Pressure Altitude Broadcast Inhibit 13
Traffic Sources and Alerting 14
On Scene Mode (OSM) 14
Interfaced Active Traffic System (Optional, GDL 88H Only with GTN) 14
Power 15
External Switches 15

190-01310-J4 Rev. 1 Page 3 of 15
FAA APPROVED

Garmin International
1200 E. 151st Street Olathe, KS 66062
USA

ROTORCRAFT FLIGHT MANUAL SUPPLEMENT

for STC SR02123SE

GARMIN GDL 84H/88H ADS-B TRANSCEIVER

Interfaced Equipment

Number

Installed

Number Required

Transponder

1 or more

1

Barometric altitude source

1 or more

1

Interfaced Equipment

Number

Installed

Number Required

GPS Navigator (GTN or GNS)

1 or more

1

Transponder

1 or more

1

Barometric altitude source

1 or more

1

Section 1. LIMITATIONS

1.1 Minimum Equipment

The GDL 84H must have the following system interfaces fully functional in
order to be compliant with the requirements for 14 CFR 91.227 ADS-B Out
operations:

Table 1 – Required Equipment

The GDL 88H must have the following system interfaces fully functional in
order to be compliant with the requirements for 14 CFR 91.227 ADS-B Out
operations:

Table 2 – Required Equipment

1.2 ADS-B Out

The GDL 84H/88H only complies with 14 CFR 91.227 for ADS-B Out when all
required functions are operational as indicated by:

 External ADS-B annunciator not illuminated (if installed) OR
 GTN or GNS interfaced display - GDL 88 ADS-B messages for ADS-

B Out functions not anunnciated.

1.3 Anonymous Mode

Anonymous Mode must only be operated while operating under VFR while
squawking a VFR code. If requested by Air Traffic Control, Anonymous Mode
must be turned off.

190-01310-J4 Rev. 1 Page 4 of 15
FAA APPROVED

Garmin International
1200 E. 151st Street Olathe, KS 66062
USA

ROTORCRAFT FLIGHT MANUAL SUPPLEMENT

for STC SR02123SE

GARMIN GDL 84H/88H ADS-B TRANSCEIVER

GDL 84H/88H Software Version

(or later FAA Approved versions for this STC)

3.32

1.4 Applicable System Software

This RFMS is applicable to the software versions shown in Table 3.

The Main software version is displayed on the External LRU page available on
some interfaced display devices

Table 3 - Software Versions

1.5 Pressure Altitude Broadcast Inhibit (PABI)

While operating within airspace requiring ADS-B equipment, per 14 CFR

91.225, Pressure Altitude Broadcast Inhibit shall only be enabled when
requested by Air Traffic Control.

1.6 Traffic Alerting

Traffic alerting is an aid to visual acquisition and may not be used as the sole
basis for rotorcraft maneuvering.

1.7 Rotorcraft with No Heading Source

Rotorcraft which do not have a heading source interfaced to the GDL 88H are
subject to the following limitations:

 The traffic page is oriented to rotorcraft TRACK, which may or may

not align with rotorcraft heading.

 The traffic display will not show ADS-B traffic when groundspeed is

less than 15 knots. The traffic display will show “UNAVAILABLE”.

 If interfaced with a TCAS system the targets from the TCAS system

which are not correlated with ADS-B targets will be displayed at a
bearing on the display that is incorrect by the crab angle of the
rotorcraft (difference between track and heading). When operating
with significant crab angles such as in rearward or sideward flight
above 15 knots the traffic display shall not be used.

190-01310-J4 Rev. 1 Page 5 of 15
FAA APPROVED