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section.
4.2The large number (over 300) of waypoints in the
grid system makes it difficult to assign phonetically
pronounceable names to the waypoints that would be
meaningful to pilots and controllers. A unique
naming system was adopted that enables pilots and
controllers to derive the fix position from the name.
The five−letter names are derived as follows:
4.2.1The waypoints are divided into sets of 3
columns each. A three−letter identifier, identifying a
geographical area or a NAVAID to the north,
represents each set.
4.2.2Each column in a set is named after its position,
i.e., left (L), center (C), and right (R).
4.2.3The rows of the grid are named alphabetically
from north to south, starting with A for the northern
most row.
EXAMPLE−
LCHRC would be pronounced Lake Charles Romeo
Charlie." The waypoint is in the right−hand column of the
Lake Charles VOR set, in row C (third south from the
northern most row).
4.3Since the grid system’s implementation, IFR
delays (frequently over 1 hour in length) for
operations in this environment have been effectively
eliminated. The comfort level of the pilots, knowing
that they will be given a clearance quickly, plus the
mileage savings in this near free−flight environment,
is allowing the operators to carry less fuel. Less fuel
means they can transport additional passengers,
which is a substantial fiscal and operational benefit,
considering the limited seating on board helicopters.
4.4There are 3 requirements for operators to meet
before filing IFR flight plans utilizing the grid:
4.4.1The helicopter must be IFR certified and
equipped with IFR certified TSO−C−129 GPS
navigational units.
4.4.2The operator must obtain prior written
approval from the appropriate Flight Standards
District Office through a Certificate of Authorization
or revision to their Operations Specifications, as
appropriate.
4.4.3The operator must be a signatory to the
Houston ARTCC Letter of Agreement.
4.5FAA/NACO 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,
website address: http://naco.faa.gov.
AIP ENR 6.2−1
United States of America 15 MAR 07
Federal Aviation Administration Nineteenth Edition
ENR 6.2 Special Operations
1. Offshore Helicopter Operations
1.1Introduction
1.1.1The offshore environment offers unique
applications and challenges for helicopter pilots. The
mission demands, the nature of oil and gas
exploration and production facilities, and the flight
environment (weather, terrain, obstacles, traffic),
demand special practices, techniques and procedures
not found in other flight operations. Several industry
organizations have risen to the task of reducing risks
in offshore operations, including the Helicopter
Safety Advisory Conference (HSAC)
(http://www.hsac.org), and the Offshore Committee
of the Helicopter Association International (HAI)
(http://www.rotor.com). The following recommended
practices for offshore helicopter operations
are based on guidance developed by HSAC for use in
the Gulf of Mexico, and provided here with their
permission. While not regulatory, these recommended
practices provide aviation and oil and gas
industry operators with useful information in
developing procedures to avoid certain hazards of
offshore helicopter operations.
NOTE−
Like all aviation practices, these recommended practices
are under constant review. Any questions or feedback
concerning these recommended procedures may be
directed to the HSAC through the feedback feature of the
HSAC web site (http://www.hsac.org).
1.2Passenger Management on and about
Heliport Facilities
1.2.1Background.Several incidents involving
offshore helicopter passengers have highlighted the
potential for incidents and accidents on and about the
heliport area. The following practices will minimize
risks to passengers and others involved in heliport
operations.
1.2.2Recommended Practices
1.2.2.1Heliport facilities should have a designated
and posted passenger waiting area which is clear of
the heliport, heliport access points, and stairways.
1.2.2.2Arriving passengers and cargo should be
unloaded and cleared from the heliport and access
route prior to loading departing passengers and cargo.
1.2.2.3Where a flight crew consists of more than one
　
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