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transmissions, including those from helicopters. The 
following practices are recommended. 

2.  Recommended Practices 

(a)  Personnel Conducting Perforating 


Whenever perforating operations are 

scheduled and operators are concerned that radio 
transmissions from helicopters in the vicinity may 
jeopardize the operation, personnel conducting 
perforating operations should take the following 
precautionary measures: 


Notify company aviation departments, 

helicopter operators or bases, and nearby manned 
platforms of the pending perforation operation so the 
Notice to Airmen (NOTAM) system can be activated 
for the perforation operation and the temporary 
helideck closure. 


Close the deck and make the radio 

warning clearly visible to passing pilots, install a 
temporary marking (described in subpara-
graph 10


1i1(b)) with the words “NO RADIO” 

stenciled in red on the legs of the diagonals. The 
letters should be 24 inches high and 12 inches wide. 
(See FIG 10




The marker should be installed during 

the time that charges may be affected by radio 

(b)  Pilots 


When operating within 1,000 feet of a 

known perforation operation or observing the white 
X with red “NO RADIO” warning indicating 
perforation operations are underway, pilots will avoid 
radio transmissions from or near the helideck (within 
1,000 feet) and will not land on the deck if the X is 
present. In addition to communications radios, radio 
transmissions are also emitted by aircraft radar, 

transponders, ADS

B equipment, radar altimeters, 

and DME equipment, and ELTs. 


Whenever possible, make radio calls to 

the platform being approached or to the Flight 
Following Communications Center at least one mile 
out on approach. Ensure all communications are 
complete outside the 1,000 foot hazard distance. If no 
response is received, or if the platform is not radio 
equipped, further radio transmissions should not be 
made until visual contact with the deck indicates it is 
open for operation (no white “X”). 

g.  Hydrogen Sulfide Gas Helideck/Heliport 

Operational Hazard Warning(s)/Procedures 

1.  Background. 

Hydrogen sulfide (H


S) gas: 

Hydrogen sulfide gas in higher concentrations 

500 ppm) can cause loss of consciousness 

within a few seconds and presents a hazard to pilots 
on/near offshore helidecks. When operating in 
offshore areas that have been identified to have 
concentrations of hydrogen sulfide gas, the following 
practices are recommended. 

2.  Recommended Practices 

(a)  Pilots 


Ensure approved protective air packs 

are available for emergency use by the crew on the 


If shutdown on a helideck, request the 

supervisor in charge provide a briefing on location of 
protective equipment and safety procedures. 


If while flying near a helideck and the 

visual red beacon alarm is observed or an unusually 
strong odor of “rotten eggs” is detected, immediately 
don the protective air pack, exit to an area upwind, 
and notify the suspected source field of the hazard. 

FIG 10


Closed Helideck Marking 

 No Radio 

Special Operations