Aeronautical Information Manual (AIM), page 577

Index   576 -- Page 577 -- 578

(a) The helicopter must be equipped for IFR
operations and equipped with IFR approved GPS
navigational units.

(b) The operator must obtain prior written
approval from the appropriate Flight Standards
District Office through a Letter of Authorization or

Operations Specification, as appropriate.
(c) The operator must be a signatory to the
Houston ARTCC Letter of Agreement.

4. Operators who wish to benefit from ADS-B
based ATC separation services must meet the
following additional requirements:

(a) The Operator's installed ADS-B Out
equipment must meet the performance requirements
of one of the following FAA Technical Standard
Orders (TSO), or later revisions: TSO-C154c,
Universal Access Transceiver (UAT) Automatic
Dependent Surveillance-Broadcast (ADS-B) Equip-
ment, or TSO-C166b, Extended Squitter Automatic

Dependent Surveillance-Broadcast (ADS-B) and
Traffic Information.

(b) Flight crews must comply with the
procedures prescribed in the Houston ARTCC Letter
of Agreement dated December 17, 2009, or later.

The unique ADS-B architecture in the Gulf of Mexico
depends upon reception of an aircraft's Mode C in addition
to the other message elements described in 14 CFR 91.227.
Flight crews must be made aware that loss of Mode C also
means that ATC will not receive the aircraft's ADS-B

5. FAA/AeroNav publishes the grid system
waypoints on the IFR Gulf of Mexico Vertical Flight
Reference Chart. A commercial equivalent is also
available. The chart is updated annually and is
available from a FAA chart agent or FAA directly,
web site address:

Helicopter IFR Operations 10-1-7

Page 577 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   576 -- Page 577 -- 578