DDG-51

ADMINISTRATIVE MESSAGE



ROUTINE



R 031300Z DEC 96  ZYB PSN 329593L31



FM PEO SC-AP WASHINGTON DC//PMS400F/PMS400B//



TO COMNAVSURFLANT NORFOLK VA//N6/N8/N43/N431A5//

COMNAVSURFPAC SAN DIEGO CA//N8/N43/N43111//

AIG ONE THREE EIGHT SIX ONE



INFO COMNAVSEASYSCOM WASHINGTON DC//91W/03K2//

COMNAVAIRSYSCOM WASHINGTON DC//511B/546//

COMSPAWARSYSCOM WASHINGTON DC//05F1/05F21/PMW176//

NAVSURFWARCENDIV DAHLGREN VA//F52/F54//

COMSURFWARDEVGRU LITTLE CREEK VA//N4//

BUMED WASHINGTON DC//JJJ//

AEGIS TRACEN DAHLGREN VA//AN00//

NAVSURFWARCENDIV PORT HUENEME CA//4C00/4L00//

NAVORDCEN INDIAN HEAD MD//N00//

USS MILIUS

PRECOMUNIT MAHAN



UNCLAS  //N08272//ACTION ADDEES OF AIG 13861 TAKE FOR INFO ONLY//



MSGID/GENADMIN/PEO SC-AP//



SUBJ/DDG 51 CLASS ADVISORY NO. C003-94, AMENDMENT 1, HERP, HERO, EMI

/GUIDANCE FOR HELICOPTER OPERATIONS//



REF/A/RMG/AEGIS PROG MGR/021639ZAUG94//



AMPN/DDG 51 CLASS ADVISORY C003-94, HERP, HERO, EMI GUIDANCE FOR

HELICOPTER OPERATIONS.//



RMKS/1.  THIS CLASS ADVISORY AMENDMENT MODIFIES THE GUIDANCE

CONTAINED IN REF A REGARDING OPERATIONAL RESTRICTIONS FOR HELICOPTERS

IN THE VICINITY OF AEGIS DESTROYERS WITH AN/USC-38 EHF SATCOM

SYSTEMS.  REF A PROMULGATED GUIDANCE REGARDING HERO SAFE DISTANCES

FROM THE AN/USC-38 SYSTEM ON AEGIS DESTROYERS FOR ASQ-81 MAD EQUIPPED

HELICOPTERS.  THE MAD CABLE CUTTER WITH IMPULSE CARTRIDGE MK 23 MOD 0

WAS CLASSIFIED AS HERO SUSCEPTIBLE.



2.  NSWC DD HAS DETERMINED THE POWER LEVELS CREATED DURING AN/USC-38

TRANSMIT OPERATION WILL NOT EXCEED THE MAXIMUM ALLOWABLE ENVIRONMENT

FOR HERO SUSCEPTIBLE ORDNANCE.  CURRENT HELICOPTER OPERATING

RESTRICTIONS WITH REFERENCE TO THE ASQ-81 MAD CABLE CUTTER FROM

AN/USC-38 EMISSIONS ARE NO LONGER REQUIRED.  DELETE HERO RESTRICTION

LISTED IN REF A PARA 4 FOR AN/USC-38 EHF SATCOM.



3.  REF A ALSO PROMULGATED A MINIMUM SAFE DISTANCE OF 300 FEET FROM

THE AN/USC-38 SYSTEM FOR PERSONNEL IN HELICOPTERS OPERATING IN THE

VICINITY OF AEGIS DESTROYERS.  NSWC DD HAS DETERMINED THAT THE

PERMISSIBLE EXPOSURE LIMIT FOR THE AN/USC-38 WILL NOT BE REACHED

BECAUSE OPERATION OF HELICOPTERS WITHIN THE BEAM OF THE AN/USC-38

WILL BLOCK THE SATELLITE LINK WHICH RESULTS IN CESSATION OF AN/USC-38

EMISSIONS WITHIN 30 SECONDS, THUS PREVENTING PERMISSIBLE EXPOSURE

LIMITS FROM BEING REACHED BY HELO CREW MEMBERS.  DELETE HERP

RESTRICTION LISTED IN REF A PARA 3 FOR AN/USC-38 EHF SATCOM.



4.  FOR COMNAVSURFLANT/COMNAVSURFPAC:  RECOMMEND DDG 51 CLASS SHIPS

BE TASKED TO MODIFY REF A IAW PARAS 2 AND 3.  ALL OTHER GUIDANCE

CONTAINED IN REF A IS STILL APPLICABLE.



5.  ORIG POC IS MR. N. SMITHSON, PMS400F51L, DSN 332-5981, X133 OR

COMM (703) 602-5981, X133.  TPOC IS MR. M. BARE, NSWCDD, DSN 249-7832

OR COMM (540) 653-7832.//



BT