CG-47 CLASS ADVISORY NO. 19-85
RADHAZ/HERO GUIDANCE
COMNAVSEASYSCOM WASHINGTON DC MSG 161520Z SEP 85
REF: A. COMNAVSEASYSCOM WASHINGTON DC 242232Z JAN 85
B. COMNAVSEASYSCOM WASHINGTON DC 102044Z JUN 85
C. OPNAVNOTE 5100 SER 45/5U394867 OF 30 JUL 85
D. COMNAVSURFPAC SAN DIEGO CA 062240Z JUN 85 (NOTAL)
E. USS TICONDEROGA 271830Z JUN 85 (NOTAL)
F. SUPSHIP BATH ME 091630Z APR 85 (NOTAL)
G. NAVSEA SPDLTR 04H2/RAV/SER 643 OF 28 JUN 82, ACN 4/3
TO OP 3565
H. COMNAVSEASYSCOM WASHINGTON DC 302110Z NOV 83, ACN 15/3
TO OP 3565
I. COMNAVSEASYSCOM WASHINGTON DC 261326Z JUN 84, ACN 19/3
TO OP 3565
J. NAVSEA OP 4154, VOLUME 2
1. HAZARD AVOIDANCE. THIS CLASS ADVISORY REVISES PREVIOUS GUIDANCE
OF REFERENCES A AND B FOR PREVENTING RADIATION HAZARDS (RADHAZ) TO
PERSONNEL DURING CG-47 CLASS SHIP OPERATIONS AND MAINTENANCE. IT
INCORPORATES THE NEW RADHAZ GUIDANCE OF REFERENCE C, ESTABLISHES A
REVISED RADHAZ ZONE FOR AN/SPY-1A OPERATIONS WITH THE BEAM AT THE
ZENITH POSITION AND PROVIDES ADDITIONAL GUIDANCE FOR AN/SPY-1A PMS
AND MAINTENANCE OPERATIONS IN RESPONSE TO REFERENCES D AND E. THE
MINIMUM SAFE DISTANCE FOR THE AN/SRQ-4 DIRECTIONAL ANTENNA IS
PROVIDED IN RESPONSE TO REFERENCE F. PREVIOUS GUIDANCE FOR
PREVENTING HERO PROBLEMS IS NOT CHANGED BY THIS ADVISORY. THIS
ADVISORY SUPERSEDES AND CANCELS REFERENCES A AND B. END OF
SUMMARY.
2. CG-47 CLASS SHIPS HAVE SEVERAL RADAR SYSTEMS CAPABLE OF GENERA-
TING HIGH LEVELS OF RF ENERGY. REFERENCE C SPECIFIES PERMISSIBLE
EXPOSURE LIMITS (PEL) FOR PERSONNEL EXPOSURE TO RF RADIATION. THE
PEL FOR SHIPS IN PORT ARE MORE STRINGENT THAN THOSE FOR SHIPS AT SEA.
FOR RADARS WITH FREQUENCIES GREATER THAN 1.5 GHZ THE PEL IS 5 MW/SQ
CM IN PORT AND 10 MW/SQ CM AT SEA. SOME ELEMENTS OF ORDNANCE USED
IN CG-47 CLASS SHIPS ARE SUSCEPTIBLE TO RF ENERGY.
3. THROUGH A COMBINATION OF PERSONNEL ACCESS CONSTRAINTS, RADIA-
TION ZONE CONTROL, OUTPUT POWER CONTROL AND MAINTENANCE OF SAFE
SEPARATION DISTANCES, RADHAZ AND HERO PROBLEMS CAN BE PREVENTED.
CONTROL FEATURES INHERENT IN THE VARIOUS RADAR SYSTEM DESIGNS, WITH
STRICT PROCEDURE IMPLEMENTATION, CAN PROVIDE EFFECTIVE RF SAFETY
WITH MINIMAL OPERATIONAL IMPACT.
4. RADHAZ PRECAUTIONS IN PORT:
A. AN/SPY-1A. HIGH POWER RADIATION IN PORT IS PERMITTED ONLY
WHEN THE QUADRATURE ALIGNMENT OF THE TRANSMITTER IS NOMINAL. HIGH
POWER OPERATION SHALL BE IN MAINTENANCE MODE UNDER LOCAL CONTROL
EXCEPT FOR THE FOLLOWING TESTS:
(1) MIP 55AEG02/3, MRC 45 FFZVN D-1 (EII 1.12.X.7.9Y, X=1-4
TRANSMITTER PHASE AND POWER TESTS OF THE FOUR ARRAYS.
(2) EII 1.12.Y.7.22, OPERATIONAL PERFORMANCE TEST MTI WAVE-
FORM PHASE STABILITY TEST (Y=1, 3).
(3) EII 1.12.1.7.3Z AND 1.12.3.7.3Z, MISSILE UPLINK MONITOR
(Z=1, 3, 5, 7, 9).
THESE TESTS MAY BE CONDUCTED IN PORT USING THE FOLLOWING PROCE-
DURE. PRIOR TO INITIALIZATION AT THE OPERATIONAL READINESS TEST
SYSTEM (ORTS) CONSOLE PERFORM THE FOLLOWING:
(1) AT THE RADAR SYSTEM CONTROLLER (RSC) CONSOLE IN BASE-
LINE CONTROL:
(A) PLACE SEARCH ELEVATION TO ZERO DEGREES.
(B) HORIZON SEARCH OFF.
(C) SEARCH MODE PASSIVE.
(D) VERIFY NO SECTOR OR RADIATION ZONES.
(2) AT THE AN/SPY-1A AN/UYK-7 COMPUTER, POSITION 7 STOP TO
THE UP POSITION ON BOTH BAY 3 AND 4. AN/SPY-1A OPERATION BOTH IN
MAINTENANCE MODE UNDER LOCAL CONTROL AND USING THE ABOVE PRO-
CEDURE PLACES THE BEAM AT THE ZENITH POSITION. FOR THESE OPERATIONS
THE HAZARDOUS ZONE IS BOUNDED BY THE BOTTOM OF THE ARRAY, 10 FEET
TO EACH SIDE OF THE ARRAY OUT TO A DISTANCE 45 FEET IN FRONT OF THE
ARRAY, AND 520 FEET ABOVE THE ARRAY. THE SAME HAZARDOUS ZONE
SHALL BE USED WHEN RADIATING TO ZENITH IN LOW POWER. PERSONNEL
MUST BE WARNED NOT TO LEAN OVER RAILS ABOVE THE ARRAY FACES. FOR
PMS TESTING REQUIRING RADIATION FROM THE STARBOARD AND/OR PORT
ARRAY, NESTED SHIPS SHOULD BE ADVISED TO KEEP PERSONNEL OUTSIDE THE
HAZARDOUS ZONE OR INSIDE THE SKIN OF THE SHIP. MOST PMS TESTING CAN
BE CONDUCTED USING THE FORWARD AND AFT ARRAYS, THEREBY MINIMIZING
THE TIME PERIOD FOR RESTRICTED ZONES ON AN ADJACENT SHIP. THE
HELICOPTER LIGHTING MAINTENANCE PLATFORM ALLOWS PERSONNEL ACCESS
TO A RADHAZ ZONE DIRECTLY IN FRONT OF THE AFT ARRAY FACE. THE
ACCESS IS NORMALLY BARRICADED, BUT STRINGENT PROCEDURAL CONTROLS
MUST BE IMPLEMENTED TO PREVENT PERSONNEL FROM INADVERTENTLY AC-
CESSING THE AREA WHEN THE RADAR IS ACTIVE. DURING NORMAL SEARCH
AND TRACK OPERATIONS IN LOW POWER, THE MAIN BEAM MINIMUM SAFE
DISTANCE IS 50 FEET.
B. FIRE CONTROL SYSTEM MK 99. EXTERNAL CW ILLUMINATOR RADIA-
TION MUST ALWAYS BE UNDER CONTROL OF C&E: E.G., SIMULATED ENGAGE-
MENT. THE BEAM MUST NOT BE DIRECTED TOWARD ANY BUILDING OR SHIP
STRUCTURE; I.E., CRANES, BUILDINGS, TOWERS AND ADJOINING SUPERSTRUC-
TURES. BY SELECTIVE TARGET DESIGNATION IN CLEAR AREAS AUTHORIZED BY
THE COGNIZANT PORT AUTHORITY, LIMITED ILLUMINATOR OPERATION CAN BE
ACCOMPLISHED. THE ILLUMINATOR GENERATES HAZARDOUS MAIN BEAM RF
LEVELS OUT TO 1850 FEET.
C. EW SYSTEM AN/SLQ-32(V)3. THE SLQ-32 SYSTEM SHALL HAVE THE
TRANSMITTER OUTBOARD SPECIAL TEST EQUIPMENT (TOSTE) INSTALLED TO
SUPPRESS RADIATION WHILE OPERATING IN PORT.
D. RADAR SYSTEM AN/SPS-49. SPS-49, WHILE ROTATING, DOES NOT
CREATE ANY RADHAZ AREAS, BUT EMI EFFECTS TO COMMERCIAL TV AND
RADIO RECEIVERS MAY LIMIT ITS USE IN PORT. CONTACT THE COGNIZANT
PORT AUTHORITY PRIOR TO OPERATION. IF SPS-49 IS RADIATING WITH THE
ANTENNA STATIONARY, THE MAIN BEAM MINIMUM SAFE DISTANCE IS 440 FEET.
E. RADAR SYSTEM AN/SPQ-9A. DURING NORMAL OPERATION WITH THE
ANTENNA ROTATING, SPQ-9A DOES NOT CREATE A RADIATION HAZARD. IF
SPQ-9A IS RADIATING WITH THE ANTENNA STATIONARY, THE MAIN BEAM
MINIMUM SAFE DISTANCE IS 85 FEET. IN THIS MODE THE ANTENNA SHALL BE
DIRECTED ONLY TO CLEAR AREAS AS AUTHORIZED BY THE COGNIZANT PORT
AUTHORITY.
F. CLOSE IN WEAPON SYSTEM (CIWS). CIWS SHALL BE DIRECTED ONLY
TO CLEAR AREAS AS AUTHORIZED BY THE COGNIZANT PORT AUTHORITY. IN
THE TRACK MODE, THE BEAM GENERATES HAZARDOUS MAIN BEAM RF LEVELS
OUT TO 140 FEET.
G. RADAR SYSTEM AN/SPS-55. DURING NORMAL OPERATION WITH THE
ANTENNA ROTATING SPS-55 DOES NOT CREATE A RADIATION HAZARD. IF SPS-
55 IS RADIATING WITH THE ANTENNA STATIONARY, THE MAIN BEAM MINIMUM
SAFE DISTANCE IS 50 FEET.
H. AN/WSC-3 SATCOM. WSC-3 CAN CREATE HAZARDOUS RADIATION
LEVELS OUT TO 15 FEET FROM THE WSC-1 ANTENNA.
I. LN-66. LN-66 PRODUCES HAZARDOUS RADIATION LEVELS OUT TO
TWO FEET FROM THE ANTENNA.
J. AN/SRQ-4 DIRECTIONAL ANTENNA (AS-3274/SRQ-4). AN/SRQ-4 PRO-
DUCES HAZARDOUS MAIN BEAM RF LEVELS OUT TO 20 FEET.
K. OTHER RADIATION RESTRICTIONS MAY BE SPECIFIED BY THE PAR-
TICULAR PORT. ADVANCE CONTACT WITH PORT AUTHORITIES SHOULD BE
ESTABLISHED.
5. RADHAZ PRECAUTIONS AT SEA:
A. RADHAZ SAFE DISTANCES. MAIN BEAM RADHAZ SAFE SEPARATION
DISTANCES SHOWN BELOW MUST BE MAINTAINED IN A MULTIPLE SHIP ENVIRON-
MENT. PERSONNEL ON SHIPS ALONGSIDE CG-47 CLASS SHIPS MUST NOT BE
RADIATED BY THE MAIN BEAM OF RADARS LISTED BELOW IF THEY ARE WITHIN
THE MINIMUM SAFE DISTANCE. RADIATING ELEMENTS NOT SHOWN DO NOT
CREATE RADHAZ CONDITIONS BEYOND THE SHIP BOUNDARIES IN THEIR NOR-
MAL OPERATING MODES.
RF SOURCE MINIMUM SAFE DISTANCE
AN/SPY-1 (HIGH POWER) 360 FT
AN/SPY-1A (LOW POWER) 30 FT
AN/SPG-62 (FCS MK 99) 1310 FT
AN/SLO-32 90 FT
CIWS 90 FT
B. MAN ALOFT. ALL AREAS ABOVE THE 05 LEVEL AND THE HELICOPTER
LIGHTING MAINTENANCE PLATFORM ON THE 04 LEVEL ARE MAN ALOFT AREAS.
PROCEDURES SHALL BE ESTABLISHED TO ENSURE RADAR AND RADIO TRANS-
MITTERS FOR THESE AREAS ARE SECURED WHILE MEN ARE ALOFT.
C. WEATHER DECK. THE 03 LEVEL FORWARD OF THE AN/SLQ-32 IS
HAZARDOUS WHEN THE ACTIVE EMITTERS ARE RADIATING. PERSONNEL
SHOULD BE RESTRICTED FROM THESE AREAS WHEN RADIATION IS POSSIBLE.
AREAS OF THE BRIDGE WINGS ARE EXPOSED TO RF LEVELS WHICH EXCEED THE
PERMISSIBLE EXPOSURE LIMITS DURING TRANSMISSION BY THE 10-30 MHZ TWIN
WHIP ANTENNA ATOP THE PILOT HOUSE, ANTENNA 2-3. THE HAZARD CAN BE
MINIMIZED BY LIMITING HF TRANSMITTER POWER TO 500 WATTS OR BY RE-
STRICTING ACCESS TO THE BRIDGE WINGS DURING TRANSMISSION BY THE TWIN
WHIP. ALL OTHER WEATHER DECK AREAS ARE SAFE.
6. HERO PRECAUTIONS:
A. CIWS. CIWS IS CONSIDERED HERO SUSCEPTIBLE IN SEVERAL FRE-
QUENCY RANGES. THE HERO RESTRICTIONS ARE SPECIFIED IN OP 3565 ACN'S
4/3, 15/3, AND 19/3, REFERENCES G, H, I RESPECTIVELY. HERO RELATED
AMMUNITION HANDLING PRECAUTIONS FOR CIWS ARE PROVIDED IN REF-
ERENCES G AND J. CIWS HERO RESTRICTIONS ARE SUMMARIZED BELOW.
(1) TOUCHING OF THE 20MM ROUND PRIMER SHOULD BE AVOIDED
AT ALL TIMES. DURING OPERATION REQUIRING ON DECK HANDLING OF BARE
(WITHOUT RADHAZ LINKS) 20MM ROUNDS, TRANSMITTERS IN THE 2 MHZ TO 1400
MHZ FREQUENCY RANGE SHOULD BE SECURED.
(2) WHEN TRAVELING IN COMPANY WITH OTHER SHIPS, PRE-
CAUTIONS SHOULD BE TAKEN TO AVOID DIRECT ILLUMINATION OF 20MM
AMMUNITION (ON DECK, IN LOADERS OR MOUNTS) WITH FIRE CONTROL OR
SURFACE/AIR SEARCH RADARS IN THE 2.7 GHZ TO 8.4 GHZ FREQUENCY RANGE
WITHIN THE SPECIFIED SAFE DISTANCES. SAFE DISTANCES ARE SPECIFIED IN
REFERENCES G AND H. THIS RESTRICTION APPLIES TO RADIATION OF CG-47
CLASS SHIP CIWS BY OTHER SHIPS AND TO CG-47 CLASS SHIP RADIATION OF
OTHER SHIPS' CIWS. THE SAFE DISTANCE SPECIFIED IN REFERENCE H FOR
AN/SPY-1A IS 1462 YARDS. THERE ARE NO RESTRICTIONS ON ILLUMINATION OF
THE MOUNT IF LIVE AMMUNITION IS TOTALLY CONTAINED WITHIN THE DRUM
MAGAZINE (SEE REFERENCE I FOR DETAILED INSTRUCTIONS).
B. SRBOC. AN/SLQ-32 RADIATION SHOULD BE INHIBITED WHEN CON-
DUCTING SRBOC HANDLING AND LOADING OPERATIONS.
C. STANDARD MISSILE. SM-1 IS CONSIDERED HERO SUSCEPTIBLE AND
SHOULD NOT BE EXPOSED TO MAIN BEAM HIGH POWER ILLUMINATION BY THE
AN/SPY-1A PRIOR TO LAUNCH. SM-2 IS HERO SAFE.
D. ASROC. ASROC CONFIGURED WITH ISA MK 4 MOD 0 IS HERO SAFE
AND THERE ARE NO HERO RESTRICTIONS ON OPERATIONS WITH THIS MISSILE.
ASROC CONFIGURED WITH ISA MK 3 MOD 2 IS HERO SUSCEPTIBLE AND SHOULD
NOT BE EXPOSED TO MAIN BEAM HIGH POWER ILLUMINATION BY THE AN/SPY-
1A OR TO MAIN BEAM ILLUMINATION BY THE AN/SPG-62. ADDITIONALLY, HF
TRANSMISSION BY THE 10-30 MHZ TWIN WHIP ANTENNA ATOP THE PILOT HOUSE
SHOULD BE DISCONTINUED DURING HANDLING, LOADING OR PRESENCE OF
ASROC CONFIGURED WITH ISA MK 3 MOD 2 IN THE VICINITY OF THE FORWARD
GMLS MK 26 LAUNCHER.
7. HELICOPTER OPERATIONS - THREE PROBLEM AREAS MUST BE CONSID-
ERED:
RADHAZ - ELECTROMAGNETIC RADIATION FROM THE SHIP'S SENSORS
COULD BE SUFFICIENTLY INTENSE TO CREATE A RADIATION HAZARD TO THE
HELICOPTER AIR CREW.
HERO - ELECTROMAGNETIC RADIATION FROM OWNSHIP RADARS MIGHT
TRIGGER THE DETONATION OF ORDNANCE AND PYROTECHNICS ON THE
HELICOPTER.
EMI/EMC - FRIENDLY JAMMING COULD RESULT FROM INTERFERENCES
BETWEEN THE SHIP AND HELICOPTER SENSORS.
A. IN PEACETIME, NONOPERATIONAL EXERCISES, SENSORS SHOULD BE
INHIBITED OR REDUCED TO LOWER OUTPUT POWER TO ACCOMMODATE CON-
VENTIONAL RECOVERIES AND LAUNCHES.
B. UNDER WARTIME CONDITIONS, OPERATION OF INTERFERING
SENSORS SHOULD BE CONTROLLED TO MINIMIZE RISK.
8. THIS INFORMATION WILL BE INCLUDED IN THE AEGIS CSTOM.
CG-47